Manga / The 100 Girlfriends Who Really, Really, Really, Really, Really Love You

The romcom with zero losing heroines!^note In the foreground, clockwise from the top: Rentarou Aijou, Nano Eiai, Hakari Hanazono, Karane Inda, Shizuka Yoshimoto, Kusuri Yakuzen. In the background: the rest of Rentarou's first 21 girlfriends except one, with the odd numbered girlfriends on the left, and the even numbered girlfriends on the right.

Yes, you just read the title correctly.

The 100 Girlfriends Who Really, Really, Really, Really, Really Love You (original Japanese title: 君のことが大大大大大好きな100人の彼女 Kimi no Koto ga Dai Dai Dai Dai Daisuki na Hyakunin no Kanojo) is a serialized manga written by Rikito Nakamura and illustrated by Yukiko Nozawa in Weekly Young Jump. The first chapter debuted on December 26th, 2019.

Rentarou Aijou has experienced 100 heartbreaks in his short life. While praying in a shrine, the God of Love appears, saying that due to a clerical error Rentarou will meet 100 soul mates in high school. However, anyone who fails to fall in love with their soulmate will lose all luck and die a tragic death. Now it's a matter of love or death, and it's up to Rentarou to decide.

Seven Seas Entertainment licensed the series for English release starting February 2022.

An anime adaptation was announced in March 2023, premiering on October 8th of that year. A second season was announced in December of that year.

A light novel short story collection written by Hamubane with illustrations by Yukiko Nozawa was released in Japan in July 2023.

Has a character page here and a recap page here.

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And so, due to how things panned out, would you guys mind accepting these tropes as having their own pages...?!

• Breaking the Fourth Wall
• Character Focus
• A Day in the Limelight
• Deconstructed Character Archetype
• Dysfunction Junction
• Foil
• Homoerotic Subtext
• Running Gag

So, these are the tropes of a wealthy family...

A-C

• Abilene Paradox: In Chapter 126, Chiyo was very uncomfortable being in the Adult Theme Park, but she chose to stay because it looked like Rentarou was fine with it. It later turned out that Rentarou was just as uncomfortable as Chiyo was with the park.
• Absurdly Youthful Mother:
  • Hahari was 13 when she birthed her daughter, Hakari (via artificial insemination). Granted, that raises further questions...
  • Zigzagged with Kusuri’s mother. She’s 55 years old^note meaning she was 37 when Kusuri was born, but she also took the failed immortality drug that made Kusuri look like an 8-year-old, giving her a similarly aged appearance.
  • Old Lady Yakuzen is 89 years old, but she also took an improved immortality drug, meaning she too has the body of an 8-year-old.
• Abusive Parents:
  • Chapter 134 confirms that the woman who yelled at a younger Shizuka and called her a freak was her own mother. She blamed Shizuka for being "creepy", and Shizuka cowered before her on the verge of tears. When she discovers that Shizuka's using her phone to talk for her, she confiscates Shizuka's phone, which prompts Rentarou to confront her about it. She does manage to redeem herself by the end of Chapter 135.
  • Hahari becomes this when she finds out her daughter is in a relationship, forbidding her from ever leaving the house and threatening to have her boyfriend killed. However, she quickly does a Heel–Face Turn when she becomes one of Rentarou’s soulmates.
  • Mei's parents abandoned her after destroying her self-esteem to the point where she no longer felt her life was worth anything.
  • Naddy's parents would lock her in the storehouse for making mistakes, and when she adopted a more American-style look, with dyed blonde hair and an "I Love America" T-shirt, they kicked her out of the house and forbade her from ever returning.
• The Ace:
  • Rentarou sought to better himself to avoid his frequent romantic rejections. By the time he enters high school he has excellent grades, communication skills, style, kindness, and athleticism.
  • Nano gets perfect scores in every class, excels at athletics, and managed to win a beauty pageant over Mimimi without putting in any practical effort.
  • Mei is hypercompetent at anything that's feasibly possible, as long as it isn't social, being an Extreme Doormat.
• Acme Products: The Serious Group's catalog includes giant-sized bathhouses, a self-improvement course at a temple, addictive cabbage, and foam cushioning, among other things. For better or worse, the effectiveness of these products will always be Beyond the Impossible.
• Acquaintance Denial: Downplayed in Chapter 125. Kusuri and Kishika's classmates notice the two of them are close to one another, which leads to Kusuri letting slip that they're dating the same boy. Kishika tries to deny the spreading rumors, which prompts Kusuri to concoct a drug to erase their memories of what she told them. After cleaning up some unintended side effects of the drug, Kishika decides to come clean about their boyfriend, though Kusuri still lets slip some of their bizarre adventures.
• Actor Allusion: This isn't the first time Miyu Tomita has voiced a girl who was in a double confession-like situation in the first episode of a show.
• A-Cup Angst: Karane will often lament about her small bust, especially compared to Hakari. She gets violent with a Lie Detector when it forces her to admit her actual cupsize.
• Adaptational Explanation: The manga doesn't bother explaining why Rentarou transcribed Circlet Love Story into an electronic format rather than just buy the ebook version; the fandom treated it as Rentarou's usual thing of going to extremes for the girls. The anime justifies it by having Shizuka's internal monologue say it doesn't have an ebook version.
• Adaptational Slimness: Karane started the manga with a small cup size that was drawn progressively flatter as the first few volumes progressed. The anime has her pretty much flat from the first episode.
• Adaptation Expansion: The anime version of chapter 21 (Episode 12) foreshadows Rentarou's encounter with the ghost of Hakari's father by having a ghostly presence appear in the same window Rentarou sees Kusuri in or opening the door for Shizuka to spin through.
• Addiction Displacement: In Chapter 107, Rentarou breaks the girls’ newfound cabbage addiction by invoking Spaghetti Kiss with the meat, since the girls are addicted to kissing him.
• Adopting the Abused: Mei's parents were crippled by Loan Shark debts, leading them to abuse and later disown her, leaving her believing that her life had no value whatsoever. She would've frozen to death if she wasn't found by Hahari, who offered to adopt her into her family. Mei, however, turned down the offer in favor of the Adopt-a-Servant approach, though the Hanazonos still treat her as though she were family.
• Adults Dressed as Children: Hahari's idea of a "freedom outfit" is to dress as a high schooler.
• Affectionate Parody: Of typical harem manga. It has all the typical tropes for the harem members while cranking up the number to exaggerated levels, and making the main character be forced to gather a harem.
• Age-Gap Romance: Several of Rentarou's soulmates turn out to be older women, including the 29-year-old Hahari, 24-year-old Naddy and 27-year-old Momoha. The most extreme example being Yaku at 89.
• Alcohol Hic: Invoked in Chapter 109. Rentarou serves the girls cold drinks in hot rooms (or vice versa) to give the girls hiccups as part of his plan to simulate drunkenness.
• Alliterative Title: One of the vignette titles in Chapter 130 is "The Dynamite Deviant Duo's Daring Dreams" (the deviant duo in question being Hakari and Momoha).
• All Just a Dream: The Volume 3 bonus chapter has Hahari pampering Rentarou in her office before seducing him into fondling her breasts. At least, that's what Hahari dreams about after falling asleep while playing House with Kusuri.
• All There in the Manual: Most of the bonus volume chapters reveal something about at least one of the harem - how Mei and Hahari met, how Iku discovered masochism, how Momiji became a Sense Freak, etc. Quite often, they introduce the girlfriends' families as well.
• All Women Are Lustful:
  • In Chapter 21, the girls are trying to peep on Rentarou bathing, with the exception of Shizuka who tries to block their way. The others tie her up in a blanket, and somehow she makes her way to the bathroom where she sees Rentarou naked and passes out from Nosebleed.
  • In Chapter 54, Chiyo forbids the girls from kissing Rentarou at school. All of them can barely handle it and eventually stage a protest.
• Ambiguously Bi: A lot of the girls have shown attraction to at least one of the other girls at one point or another. For some it's just a basic acknowledgement of the beauty and cuteness of the others, but others have also shown very explicit Homoerotic Subtext.
• Ambulance Cut: In Chapter 27, the Gorira Alliance attempt to finish a ramen-Eating Contest after already having had gorged on a ton of food from earlier in the competition. The next panel shows them being taken away by ambulances.
• And I Must Scream: Chapter 11 involves all the at the time current girlfriends (except Kusuri) becoming "zombies" who only care about kissing Rentarou to the exclusion of everything else, even rational thought.
• Anger Born of Worry:
  • In Chapter 19, Karane slaps Hakari and calls her an idiot after she very nearly throws herself out of a two-story window in despair. Considering both of them began sobbing in Rentarou's arms right after, she was more upset she could have lost her friend.
  • Played for Laughs in Chapter 104. After being helped back home by the girls through an arduous journey, the rabbit’s mother smacks his face before escorting the girls to a flower meadow.
• Angry Cheek Puff: In Chapter 134, Shizuka puffs her cheeks to try and convey that a character in a story is feeling hostile towards his opponent, but Nano mistakenly thinks she's conveying that the character was "swallowed up by bottomless cuteness", which confuses her.
• Animal Motifs:
  • Mei is repeatedly compared to a dog, with how eagerly and excitedly she obeys her master's commands.
  • Tama invokes this, presenting herself as a cat if at all possible.
• Anti-Climax: After Rentarou and Mei lock eyes, Mei says that she cannot fall in love with him as it would be improper for a maid to fall in love with her master's boyfriend, complete with fake ending credits. The very next page, Hahari orders her to be Rentarou's girlfriend and she accepts.
• Arc Words: "...really, really, really, really, really..."
• Armor-Piercing Question: Rentarou delivers one to Shizuka's mother in Chapter 135:
  Rentarou: What exactly makes you think Shizuka-chan wants to be like everyone else?! Has she ever once told you that she does...?!
• Art Shift: At the end of Chapter 41 the girlfriends' beautification efforts have turned them all into '70s shoujo characters.
• Ascended Extra: The Librarian from Chapter 3. She appears in only one panel in the manga and one single dialogue but in the anime she gets more dialogue and a original scene.
• Baby Morph Episode:
  • Chapter 28 features the girls (except Hakari) turned into babies thanks to one of Kusuri's drugs (again).
  • Chapter 84 repeats the above with all the girls who weren’t baby morphed before.
  • And again in Chapter 167.
• Baby's First Words: Conversed in the Volume 11 bonus chapter.
• Backing Away Slowly: In Chapter 101, this is Mei's reaction to walking in on Rentarou and Mai debating over which of them knows more endearing traits about Mei.
• Bad Liar:
  • Kurumi gets annoyed when Hahari dotes on her while serving her food in the Eating Contest, telling her that she never asked her to act like her mom, ignoring that she had previously asked Hahari to pretend to be her mom so she could enter the tournament.
  • Karane, thanks to her tsundere tendencies. She often denies or downplays her true feelings, but her facial expression and manner of speaking make them obvious.
• Bait-and-Switch:
  • Initially, it looks like Rentarou's decided to date both Hakari and Karane while preventing them from finding out, until he reveals he's actually decided to date both of them openly.
  • When Rentarou introduces Shizuka to Hakari and Karane, it looks like Hakari's crying because she's hurt Rentarou's got another girlfriend. In reality, she's crying Tears of Joy that he hasn't dumped them for Shizuka.
  • In Chapter 74, Rentarou is invited to Kusuri’s home. Remembering how he got Zing’d with Hahari and Chiyo, Rentarou braces himself for a Zing from Kusuri’s mother… and nothing happens. But then Kusuri’s grandmother comes home and—ZING!!
• Balanced Harem: Rentarou does everything in his power to invoke this trope, no matter how many girlfriends he collects. The series' Tagline is "the romcom with zero losing heroines", after all.
• Balloon Belly: The anime's first opening ends on this note, Rentarou's first five girlfriends overfeeding him from their lunches.
• Baseball Episode: Rentarou's family joins Iku's baseball club to prevent it from being shut down after all the other members went to America for training. If they can win the next practice game against Jurassic High, the club is saved.
• Bathtub Bonding: Nano invokes this trope in Chapter 134 to more easily press Shizuka about what's troubling her.
• Batman Gambit:
  • Rentarou pulls one off in Chapter 25. In an Eating Contest in which the preliminary round has the contestants eat rice and various side dishes, but only the eaten rice counts towards one’s team’s score, he deliberately taunts Kurumi with a beef bowl, knowing that she won’t be able to resist it. Her reaction is so over-the-top, of course, that the other contestants are all tempted to go for the side dishes instead of the blander rice, allowing Rentarou and Kurumi to make it to the next round by eating nothing but that. Of course, had the other teams ignored them, he’d have put his team at a disadvantage.
  • Rentarou uses a variety of these in the sumo wrestling tournament at the end of Volume 8, exploiting certain personality quirks of the girls to gain an advantage over them.
  • Meme uses this on herself in Chapter 77: when she and Mimimi are trapped under the Serious Waterfall Shower, she asks Mimimi to kiss her on the neck, knowing it'll trigger her Ninja Log reflex and let her escape so she can get Mimimi out as well.
  • Mimimi's opponent in the track and field round in chapter 97 makes fun of Mimimi's face, knowing that her instinct to stop distorting her face while running would slow her down. She tries it again in chapter 99, but this time, Mimimi doesn't fall for it.
  • Momoha uses this on herself in Chapter 170. Watching Mai struggle with passing a bunny girl certification test, she realizes Mai's competence shoots up when she's acting as her caretaker, so she gets herself drunk out of her mind to get Mai to focus on taking care of her.
• Beach Episode: On the Pool Episode side, Chapters 8 and 9 have Rentarou and his then-current girlfriends head for an indoor pool, while Chapter 127 has them head for a night-pool. On the Beach Episode side, Chapter 166 has Rentarou and Kishika taking part in a beach swordfighting tournament.
• Be Careful What You Wish For: Rentarou wishes for a girlfriend; he gets one hundred of them.
• Because Destiny Says So:
  • Soulmates are fated to meet at a certain point in their lives. What happens afterwards isn't guaranteed, only that initial meeting, so things won't necessarily work out - but if that happens, it means they no longer have any good luck and will die of misfortune soon afterwards. Meeting Shizuka helps Rentarou realize this is not why he's doing this, but because he genuinely loves the girls.
  • One implication of this is that Rentarou was supposed to meet the girls in the order we see.
• Befriending the Bullied: Ahko's friendship with Karane is a result of this trope.
• Berserk Button:
  • If anyone says anything remotely negative about one of his girlfriends, Rentarou flies into a rage and has to be restrained.
  • Picking on Shizuka is this for the whole harem. Someone doing so in chapter 35 causes all of them to become blonde and get a massive power up.
• Bespectacled Cutie:
  • Chiyo's signature look includes her glasses, and she'll cry if she loses them.
  • Chapter 93 is devoted to showcasing the whole family as these, in ways that fit their archetypes.
  • Suu sports a sizable set of circular spectacles.
• Big Damn Kiss: These happen a lot over the course of the manga between Rentarou and his many girlfriends. They're always presented as epic moments, too, despite their frequency.
• Big Fancy House: Hakari lives in one, much to Rentarou's surprise when she is placed under house arrest by her mother.
• Big Ol' Eyebrows: Rentarou has thick black eyebrows.
• Birthday Buddies: Meme and Kishika, who were both born on October 10th.
• Blackmail: Toruru Kijineta uses photos of Hahari's amorous interactions to blackmail Hahari into letting her continue harassing Meme for photos of her.
• Bland-Name Product:
  • Bocky sticks show up in Chapter 2.
  • Chapter 27 mentions D*sons.
  • Mei uses Yoogle in the volume extra for Chapter 136. Rentarou uses Googlo in Chapter 162.
• Blatant Lies: Chapter 42 is called "Just a Totally Normal and Average Hair Styling Chapter".
• Blind Without 'Em: Chiyo can't see well without her glasses, and the stress of it is enough to make her bawl her eyes out.
• Blood from the Mouth: Played for Laughs in a non-lethal manner:
  • Rentarou coughs up blood in Chapter 18 when the Lie Detector registers Karane’s initial answer about her feelings for him as false, and keeps coughing up blood until she answers with a Title Drop and the machine registers the answer as true.
  • He also vomits blood in Chapter 33 after pretending to reject Iku’s confession.
  • Mei starts vomiting blood in Chapter 47 as she’s about to kiss Hahari.
• Borrowed Catchphrase: In Chapter 122, Meme begs Rentarou to kill her in the same way Kishika does after she recovers from an infantile state.
• Bowdlerise: The official English manga translation has Kusuri creating "medicines" as opposed to drugs. The anime subs play with it; Kusuri's names for her creations all call them "medicines", but every other reference calls them drugs.
• Break Up Demand: Some of the girlfriends’ parents have made these:
  • When Hakari’s mother finds out about her daughter dating a boy with four other girlfriends, she arranges to have Hakari transferred to a new school. This leads to Rentarou breaking into her mansion to rescue Hakari, which ultimately results in the mother joining the harem herself.
  • Kusuri’s father in Chapter 74 tells Rentarou to break up with all of his current girlfriends except Kusuri.
• Breast Expansion:
  • In Chapter 77, both Hakari and Karane get into a bath that enhances their chest size. Karane refuses to leave it, knowing that her chest size will return to normal once she does, but Hakari manages to talk her into doing so.
  • In Episode 7, Hakari fantasizes that Kusuri's drug will give her extra-large breasts and buttocks, with significant attention given to how much they wobble.
• Bribing the Homeless: Played with in Chapter 149. Momoha, who lives in a tent at the school where she works, is offered money by Hahari if she doesn't drink. The bribe comes about not because she's homeless, but to stop Momoha from engaging in underage drinking and garner the wrath of the Big Cheese since she's in Mimimi's body at the time.
• Brick Joke:
  • The start of Chapter 29 shows the Vice Principal chasing after an ostrich that escaped from the zoo; the very end of the chapter reveals that she had been kicked in the head unconscious by said ostrich.
  • One of the first drugs Kusuri uses on Rentarou is the blood magnetization drug, which Kusuri mentions would cause two people to attach upside down from one another if they each drink the same polarity dose. In Chapter 61, Kusuri splashes two men harassing her, Shizuka, and Chiyo with said drug, with both men drinking enough of the drug that they get stuck together in the aforementioned upside down position.
  • At the start of Chapter 89, the monk in charge of the Serious Overnight Ascetic Training states that the training is so hellish that only one person has ever made it to the end. The very last panel reveals that that person was none other than Rentarou.
• Bridal Carry:
  • Rentarou carries Nano like this in Chapter 26, while helping her off of the platform she has gotten stuck on.
  • Iku carries Rentarou like this in Chapter 60, when he is too exhausted to walk home.
  • In Chapter 73, Hahari remembers that Rentarou once carried her like this during a date when she suffered a Broken Heel.
  • In Chapter 80, Rentarou carries Hahari, Mei and Mimimi like this - at the same time.
• Briefcase Full of Money: Hahari apparently keeps these on hand at all times. She gives one to Kusuri when playing pretend, much to the envy/astonishment of the other girls (the cash blows away in the wind).
• Broken Pedestal:
  • Downplayed - while the girls are a bit disappointed that Kishika isn't as cool as they first thought, they're happy enough to accept her.
  • Similarly, when they discover Rin's not the respectable Yamato Nadeshiko she normally appears to be, they do their best to reassure her by explaining they're weirdos too.
  • In Chapter 90, Shizuka is devastated to discover the author of her favorite romance novel series is an alcoholic, chain smoking punk. Subverted in that it turns out the punk was actually an impostor who was trying to ruin the author's reputation. The real author is a kindly, middle-aged woman.
• Broken Record: In Chapter 153, Tama tries to get feedback from Hahari on her dancing, but the latter responds to the former with a perverted gurgle. Twice.
• Bullying the Disabled:
  • Shizuka didn't have any friends before meeting Rentarou because her schoolmates disliked her and thought she was weird for using a book to communicate, and her mother tried to force her to speak normally on separate occasions by hitting her and taking her phone away.
  • Ahko was the victim of social bullying from her friends, being shunned and ostracized for her Frozen Face and seemingly clueless behavior, without consideration for how that was hurting her.
• Burger Fool: The splash panel for Chapter 71 depicts the girls as roller skate-wearing fast food workers at a burger diner.
• Buxom Beauty Standard:
  • Hakari often brags about her G-cup chest to get on Karane's nerves. She becomes deeply frustrated when Meme is revealed to have an even bigger chest.
  • Her mother Hahari has even bigger I-cup breasts, and is quite willing to use them to seduce Rentarou.
  • The girls with E-cups and above as of Chapter 171 are Nano, Naddy, 18-year-old Kusuri, Momoha, Kishika, Eira, Yamame, Hakari, Meme, Tama, and Hahari.
  • Chapter 172 declares "slender" to be any cup size below E-cup after puberty, which is rather bigger than usual definitions of "slender" (cf. D-Cup Distress, a trope about women who dislike having large breasts).
• Call-Back:
  • Ahko recognizes Rentarou and the girls from when they created their own idol group.
  • In Chapter 91, the girls dive in for a kiss from Rentarou while chanting "Kiss!", with a side note explaining that they’re not drugged.
  • In Chapter 125, Kusuri splashes the vice principal with one of her drugs, causing her makeup to melt off her face, just like what happened in Chapter 12.
• Career Versus Man: Chapter 63 ends with a producer offering to make the girls legendary idols on the condition that they never pursue any kind of romantic relationship. All the girls immediately reject the offer.
• Cassandra Truth:
  • When Rentarou mentions he has 21 girlfriends when at a fantasy cosplay event, other guests assume he's just making up a cool backstory.
  • When Rentarou tells Himeka he met a god (the first time he's told a girlfriend this), she thinks it's like all those other people who start a religion or hold seminars about it.
• Cast Full of Crazy: The fact that this work has its own page for Dysfunction Junction should tell you just how insane the characters are.
• Cast Herd: Averted. All the girlfriends are together on the roof whenever Rentarou goes up there, and there are no distinct separations of groups within the harem. What the series generally does instead of having permanent subgroups is have temporary subgroups for a chapter, either with some kind of connection (the girls who are or look like children, the ojou-like girls, the tsunderes, etc.) or with girls who contrast each other in some way.
• Catapult Nightmare: Played for Laughs in Chapter 56. Rentarou wakes himself up whenever his dreams have him getting intimate with any of his girlfriends.
• Catch a Falling Star: A surprisingly recurring occurrence in the manga.
  • Shizuka gets caught by Rentarou after bouncing off the chests of the other haremettes in Chapter 14.
  • Baby!Karane and Baby!Kurumi get caught by Rentarou after being dropped by Hakari in Chapter 28.
  • Shrunken!Nano gets caught by Rentarou after getting blown out of his pocket in a windstorm in Chapter 72.
  • Mai gets caught by Rentarou after being catapulted while ringing a bell in Chapter 114.
• Cat Girl:
  • Both Kusuri and Yaku dress like this in the splash page for Chapter 76.
  • Tama decided to quit being human and become a cat, including dressing as a cat girl.
  • The whole family dresses up as cat girls for Tama's introduction to the harem in Chapter 142 (or cat boy, in Rentarou's case).
• Cat Scare: In Chapter 21, the cat of a wealthy family follows the girls into the attic above the bath, causing them to freak out when they think there’s a mouse in there with them.
• Censored for Comedy: The anime bleeps out all mentions of meth.
• Cheaters Never Prosper:
  • Takeko Deluxe cheats an Eating Contest by dressing up a machine to store all of the food, letting her eat without end. In the last round, her machine gets full and she's forced to use her own stomach, but it isn't enough and she loses while barfing like crazy.
  • The mayor of Kiraisugi-chou attempts various cheats in the sports festival. At first, he hires professional athletes and uses (what's essentially) bribery to make the festival officials cheat for him, but once the girls find ways to exploit their own quirks, his plan falls apart. This comes to a head when he tries to have Sukisugi-chou conduct the relay race with an oiled baton; not only does the official accidentally oil everyone’s batons, but the girls manage to handle their baton better than the other teams.
• Chekhov's Gag:
  • Rentarou being instantly awoken from an unconscious state due to his girlfriends being in trouble, first in Chapter 9, and then later in Chapter 137.
  • In episode 11 of the anime, the fourth wall is broken in part by Rentarou stating they can't skip the ending credits because a special ending was produced for that episode, prompting him to get called out for spoiling. No mention of this is made but, come the end of the episode, there is indeed a special, Hahari-centric ending song for the episode.
• Chekhov's Gun: In Chapter 11, Kusuri gives Shizuka a drug that causes Shizuka to grow rabbit ears. Shizuka uses the same drug in Chapter 42 to lure away the strands of Hahari's hair.
• Chemistry Can Do Anything: Kusuri's various drugs, from reversing aging to body swapping to giving Prehensile Hair.
• Chick Magnet: The very premise of this series is that Rentarou is an extreme example of this, having 100 soulmates.
• Cliffhanger:
  • Chapter 8 is a parody, with the narration announcing Hakari and Nano are in trouble thanks to some scumbags, Shizuka is stranded, Karane's complaining about being chilly, and Rentarou's on the verge of death.
  • Chapter 14, "The Holy War of Love and the Soul", ends with Hakari asking Rentarou to break up with her. We don’t learn till the next chapter that this is because her mother is prohibiting her from ever seeing her friends again.
  • Chapter 16 ends on Rentarou being confronted by a seemingly impassable array of infrared sensors.
  • Chapter 26 is another parody, with all the girls bar Kurumi being in danger of puking.
  • Chapter 144, "The Inda Family Secret", ends with Rentarou proposing to Karane, setting the stage for him proposing to all the girls in Chapter 146.
  • Chapter 148 has a parodied enforcement, ending on the question of whether it's Iku or Uto in Kurumi's body because the author wanted to force a cliffhanger. Chapter 149 reveals it's Iku.
  • Occasionally, when Rentarou meets a girlfriend who really crosses the line in terms of expectations, their ZING!! will be a cliffhanger, as seen with Hahari and Yaku.
  • The anime makes Rentarou's first meeting with Shizuka the cliffhanger of Episode 2.
  • Episode 7 plays up Chapter 11's ending to make it more of a cliffhanger, as Kusuri reveals they only have about an hour to reverse the girls being turned into kiss zombies, and the zombified girls leap at Rentarou and Kusuri.
• Clothing Damage:
  • Kusuri's "become even sexier" drug causes Hakari's clothes to melt off of her body, leaving her naked.
  • The Tyranno Cannon Full Burst is such a powerful fastball pitch that not only do Iku's clothes blow off in the wind when she hits it, but Rentarou is left in his underwear just from catching it. Fortunately, undergarments are unaffected.
• Cloudcuckoolander: Just to save a whole lot of time here, nearly everyone on practically every level.
• Comic-Book Time: Lampshaded in Chapter 157, as Chiyo wonders how Mother's Day can be coming up when it's been months since the entrance ceremony.
• Compressed Vice: Happens in many chapters as Rule of Funny demands, but most prominent in Chapter 52, where the entire harem (Rentarou included, arguably) gets hit with this so Chiyo can show off her OCD. The "vices" in question range from literally just-invented (Shizuka's permanently-unruly hair) to preexisting-if-petty (Hakari, Karane, and Mimimi violating the school dress-code, Nano being a Flat-Earth Atheist), to legitimately valid (Kusuri's obsession with drugs, Mei driving with Eyes Always Shut, Hahari's entire... existence).
• Continuity Cavalcade:
  • In Chapter 50, Karane absorbing the massive ball of tsundere energy include a montage of Karane's tsundere moments from throughout the manga.
  • Chapter 151 ends with the girls presenting Himeka with copies of the manga showing Rentarou's various ungodly acts of affection throughout the story.
• Contrived Coincidence:
  • Exaggerated with all the girls having time and access to eat lunch together on the high school roof regardless of whether or not they attend a different school or what kind of jobs they have (assuming they have a job).
  • Frequently lampshaded whenever a chapter features a particular subset of girlfriends, with a footnote saying "Unfortunately, the rest of the family was either busy or had other things come up.".
    • That being the case, in every instance of a new girl joining the harem, all the girls are able to be present for the newest addition’s introduction to the harem.
  • Subverted in Chapter 16. Kusuri just happens to have a special drug that allows people to see infrared, which is just what the gang needs to get past the infrared alarms in Hakari's house and help her escape - but it turns out Kusuri had the drug on her because she was actually planning on mailing it to a company that specialises in making drugs, in the hopes of becoming employed by the company and going to America to make drugs there. The others are shocked that she's giving up this once-in-a-lifetime opportunity to help them rescue Hakari.
    • The anime further subverts this trope by Foreshadowing this development, adding the flashback scene from Chapter 16 to Episode 7 when Kusuri first gets to know the other girls.
  • Played straight with regards to both Hahari, and, later, her maids Mei and Mai being among Rentarou's destined soulmates. In the former case, it saves their lives since it means she gives up trying to forcibly separate Rentarou and her daughter, but the latter two are present for quite some time before they finally lock eyes with him and fall in love.
  • Also played straight in Chapter 84, when the damage Kishika does to the test tube containing Kusuri's babyfier drug turns Kishika and everyone else who was standing nearby into babies - and it just so happens that Hakari and all the girlfriends from Mei onwards were standing near her.
  • Exaggerated to the point of parody in Chapter 152, which has the first 13 girlfriends say they have plans set in stone that day when an event gets rescheduled, leaving the other 13 to take care of things.
• Cool, but Inefficient: Nano and Kusuri almost mention this trope word for word in Chapter 34 when talking about the latter spinning her arm to throw a baseball.
• Corrective Lecture: Chapter 21 ends with Rentarou discovering that all the girls except Shizuka were trying to peep on him taking a bath and promptly lecturing them about their actions.
• Cracks in the Icy Façade: Nano continuously rebuffs Rentarou's attempts to approach her during their first day after she is revealed as one of his soulmates, claiming him to be an insignificant part of her routine. As soon as she gets home, however, she is unable to focus on her studies due to being swamped with thoughts about him. She takes up his offer of a date the following day with the expectation of proving his insignificance to her, but Rentarou instead proves that there is significance in being happy with the people you love by almost burning the photos he took during the date, causing her to snatch the photos from him and break down in tears.
• Crash-Into Hello:
  • How Rentarou meets Hakari and Karane.
  • Hiro invokes this by rolling a marble under Rentarou's foot.
  • This is also how Rentarou meets Rin.
  • Rentarou's first encounter with Suu is this.
• Crazy Workplace: Hahari Hanazono, whose family owns a large number of successful companies, buys out Rentarou's school to become the new chairwoman in order to spend time with him. Her fetish for anything she finds cute led to her implementing hiring policies based on applicants' cute factors, with at least one of her personal maids, at least one of the school's teachers, and at least one of her company's employees being hired for their respective positions because she thought they were cute.
• Credits Gag:
  • A fake end-of-chapter caption is shown when Rentarou gets captured by zombie-Nano, declaring the end of the series... but the fake credits ask what's going to happen on the next page.
  • A similar cliffhanger happens with Mei declaring she cannot be Rentarou's girlfriend. The next and final page has Hahari order Mei to do it and the problem is suddenly gone.
  • When the world gets covered in Hahari's hair, the end-of-chapter caption declares it's the end of the series and invites readers to look forward to the creators' next projects. The credits, however, point out this is the first chapter of Volume 6.
  • When Rentarou confesses to Meme, she gets so embarrassed she disappears. The captions on the next page say "It was the last time that anyone would see her ever again. She was the one person he couldn't save..." and the end-of-chapter credits announce that the series will now be retitled "The 99 Girlfriends Who...". Rentarou, of course, is having none of this and rips the previous pages out.
  • After the girls put on an amateur idol show for a school festival, they get scouted by a producer and the credits announce that the "Idol Road Arc" is about to begin. Then the producer states that as idols, they will be forbidden from romance. The next page has them immediately walking out of the room, and the credits announce the end of the "Idol Road Arc".
• Creepy Child: Shizuka’s mother apparently thinks she is one because she doesn’t speak aloud, calling her this trope by name to her face. Neither the other characters nor the readers agree.
• Crippling Overspecialization: During the baseball arc, villainous pitcher Terano specializes in overwhelming fastballs, which have such force that any batter who tries to swing the bat at them will wind up badly injured. The Ohananomitsu team realizes the ball travels the same path every time and they can easily bunt it, allowing even weak team members to score bases.
• Cross-Referenced Titles:
  • Each chapter featuring Rentarou finding a new soulmate will be named after that girlfriend. Sometimes these are straightforward Character Titles, but other times - especially when the girlfriend isn't someone in Rentarou's grade - they'll be more flowery descriptors. (Kusuri's, for instance, is "The Mysterious Senpai In The Chem Lab".) The anime avoids using direct Character Titles altogether, preferring to use descriptive titles, even if it's something like Hakari and Karane's "The 2 Girlfriends Who Really, Really, Really, Really, REALLY Love You (98 To Go)".
  • "Freaky Friday" Flip chapter "His Name" has a sequel in the two-part "His Name, Returns (First Half)" / "His Name, Returns (Second Half)".
  • Baby Morph Episode "Everybody Was a Baby at Some Point" has the sequels "Everybody Was a Baby at Some Point Returns" and "Everybody Was a Baby at Some Point Returns Returns". "Everybody Was a Coed at Some Point", which shares their naming scheme, features 29-year-old Hahari having a date with Rentarou as a fellow high schooler.
  • The three-part story about Karane losing her tsundere nature has the chapter titles "Tsundere Lost", "Tsundere Recovery", and "Tsundere Beloved".
  • "Momiji-chan's Fondling Festival", where Momiji massages everyone, has a sequel in "Fondling Festival (Part Two)", where she proceeds to outright grope everyone.
  • The first idol arc has the chapter titles "The Rentarou Family's Idolmaking Project" and "And Now, to a Brand New Stage". Its sequel features the titles "The Rentarou Family's Idolmaking Project (2nd Generation)" and "And Now, to a Brand New Radiance".
  • "Rentarou's Family's Daily Life" is a Vignette Episode about moments from the cast's lives, with subsequent installments adding "Part Two", "Part Three", etc.
  • The chapter titles for the bad news drug trilogy follow the same "[Body type]-[hairstyle]-[clothes] Combo Chapter" format, for example "The Stacked Woman-Ponytail-Knit Sweater Combo Chapter".
  • Partial example: From Volume 8 onwards, the Whole Episode Flashback bonus chapters have been titled "My First [X]" (in the scanlation) / "Her First [X]" (in the official translation). The official translation also includes Volume 6's bonus chapter in that format.
• Crowded-Cast Shot: With as many girlfriends as Rentarou's met, mass reaction shots become increasingly common the longer the series goes on. A frequent recurring example is whenever Rentarou introduces a new girlfriend into the Rentarou Family, there's a single panel with a chibified headshot of every prior girlfriend as Rentarou is asking permission to include her into the family.
• Cute Mute: Deconstructed with Shizuka, whose shyness and stutter caused her not to speak aloud but instead point out all her lines from a book, which caused people to shun her as a freak, which made her more shy, in a vicious cycle.
• Cuteness Overload:
  • Happens frequently to Rentarou when his girlfriends get flirty.
  • Happens to the whole cast when they see Rentarou cross-dressing during the slumber party, and again when they see Rentarou as a cat boy during Tama's introduction.
  • Hahari is especially prone to it whenever the shorter family members do something cute.
  • Exaggerated when the group goes to Karaoke. Kusuri doses everyone with a "super sensitive to cuteness" drug, at which point Shizuka singing is enough to affect them like hurricane-force winds.
  • Exaggerated again at the Fall Kids theme park, with Rentarou and Hahari dissolving into blobs from the cuteness of the family's "kids".
  • This is a Running Gag, where the overloaded individual has their soul exit their body, requiring another person to grab it and put it back in.
• Cute Witch: Chiyo dresses like this in the splash page for Chapter 76.

D-G

• Dandere: Shizuka. Her voice is so quiet she decides to communicate by pointing to passages in her favorite book. Rentarou makes her a text-to-speech phone app so she can look people in the eye when speaking.
• Dangerous Forbidden Technique: Terano of the Opposing Sports Team can only use her ultimate fastball, the Tyranno Cannon Full Burst, once per game, because any more and she'd dislocate her shoulder. She saves it for when it's the bottom of the ninth with two strikes and two outs, and it'll all be over no matter what after this pitch.
• Date Peepers: In Chapter 105, Shizuka and Kusuri follow Rentarou to an amusement park during a date with Yaku and Kishika, due to Kusuri’s belief that Kishika was trying to monopolize her grandmother.
• Deadpan Door Shut: Nano finds Hahari hiding under Kusuri's lab coat, having taken inspiration from Meme hiding under Mei's dress. Nano simply drapes the lab coat back over Hahari and informs Kusuri that it was "the incorrect lifeform".
• Debut Queue: Rentarou, Hakari, and Karane are all introduced in Chapter 1, and after that, every girlfriend gets her own introductory arc, even if she had Early Bird Cameos before.
• Deconstructive Parody: This manga thrives on Deconstructed Character Archetype, yet it is also a Gag Series at the same time.
• Decoy Backstory: Some of the girlfriends' initial backgrounds turn out to be unreliable, to a greater or lesser extent:
  • Naddy lied about her past to hide her original identity.
  • Yamame flips this, as the audience gets the real story before the decoy (although the characters, aside from her father, are unaware of the truth). She thinks she was taught how to use stilts by a giant talking bug, but in reality, she was taught by her father, who'd hypnotized her into thinking he was a giant talking bug to help her deal with her guilt over accidentally squishing a bug.
  • Ahko initially places the blame for the breakdown of her relationship with her old friends on herself. When they eventually show up, it turns out they intentionally ostracized her and let her take the blame, Ahko's self-hatred preventing her from seeing what was really going on.
  • Uto is prone to telling tall tales about herself, making it hard to tell what's real and what's her making stuff up.
  • Rin thinks her fetish for violence began with watching a Resident Evil film. The volume 14 bonus chapter reveals she had a lifelong thing for violence, but her father raised her to be a proper lady in order to avoid her getting her heart broken over it, and she's long since forgotten about it.
• Defrosting Ice Queen: Nano. Her meeting Rentarou taught her there was more to life than being perfectly efficient, and she is learning to care for others.
• Denser and Wackier: This manga already starts out far crazier and sillier than typical harem series, then the craziness only intensifies as the manga goes on and adds more girlfriends. The one-two punch of Kusuri's and Hahari's introductions is a major turning point, showing most anything is on the table, particularly girlfriends.
• Detachable Doorknob:
  • In Episode 8, Nano breaks the doorknob off the door to the broom closet to get to Rentarou hiding inside.
  • In Chapter 54, after Chiyo is accidentally given a kissing zombie drug by Kusuri, she tears the doorknob off the school roof's only door to ensure Rentarou can't escape her. Rentarou is forced to break the door down so Kusuri can get to her lab to make her Magic Antidote.
• Died in Your Arms Tonight: We see a flashback to what is very likely the exact moment Hakari’s father died, when he is consoling Hahari, asking her to not give up on love after he is gone, and she is holding his hand. Then he smiles as the sun sets behind him. No wonder Hahari is so messed up...
• Distracted by the Sexy:
  • Nano and Hakari have a hard time giving Rentarou CPR because they lose their concentration when doing mouth to mouth.
  • Nano in chapter 67 can't defeat Rentarou in sumo because she can't stop admiring his collar bone.
• "Do It Yourself" Theme Tune:
  • The OP is sung by Kaede Hondo (Hakari), Miyu Tomita (Karane), Maria Naganawa (Shizuka), Asami Seto (Nano), and Ayaka Asai (Kusuri).
  • The ED for episode 11 is performed by Sumire Uesaka (Hahari).
• Don't Try This at Home:
  • When Nano shoves sushi down her throat without chewing it, there is a quick editor’s note saying, "Unless your throat is made of a special alloy, please do not imitate this."
  • Also, Chapter 39 opens with Hahari, Mei and Kusuri hanging out and drinking from wine glasses. Since the latter two are under Japan's drinking age, the caption at the bottom says that the manga does not condone underage drinking, but that Mei is drinking grape juice and Kusuri has a strong drug. So underage drinking is bad, but drug use is A-OK.
  • Chapter 58 warns people against placing themselves in People Jars.
  • In Chapter 61, Rentarou uses two shopping carts as makeshift weapons to frighten two guys who are threatening Shizuka, Kusuri and Chiyo. A caption at the bottom of the panel tells people not to try it at home, unless someone important to them is about to be killed.
  • Inverted in Chapter 109. A caption encourages good boys and girls to feel free trying their own pretend drinking party.
  • The end of Chapter 149 warns readers against swapping bodies just to mess around.
• Doomed New Clothes: Mimimi buys Rentarou a whole new white outfit upon meeting him for the first time. While taking a break after the excursion, Mimimi makes some comments about beauty that cause one of their fellow shoppers to become offended and throw bubble tea at her. Rentarou shields Mimimi, but his new outfit is stained with the drink.
• Double Entendre: This exchange from Chapter 27:
  Announcer: It’s like they’re D*sons!
  Karane: What’re ya tryin’ to say? That they’re vacuums that don’t lose their suction?
• Double Subversion: Of May–December Romance. In Chapter 74, Rentarou visits Kusuri's parents. Remembering how he got Zing'd with Hahari and Chiyo, Rentarou expects Kusuri's mother (who is mentioned to be 55 years old) to be his next girlfriend... but she isn't. Then at the end of the chapter, Kusuri's grandmother comes home and—ZING!!
• Down to the Last Play: Done twice in one game! First, Rentarou's family are down by six, so the mercy rule will cause the game to end early and them to lose if, after the next inning, they give up any more runs. Shizuka makes an error that gives the other team three runs, which causes her to run to the dugout crying and her teammates to go Super Smitten. They are able to pull off a miracle rally entirely through bunting, and manage to lower the opponents' lead to three runs by the bottom of the ninth, with two outs. Then they manage to load the bases in time for Iku to hit a grand slam, winning the match.
• Dramatic Irony:
  • Himeka introduces herself to the harem by declaring that if she associated with "perfectly ordinary people" like them, she'd be seen as normal too, so she's just going to stick with dating Rentarou. The audience, meanwhile, gets the popcorn ready, because she's about to discover these are the last people you'd describe as "perfectly ordinary".
  • In Chapter 156, an elderly couple sees Rentarou and Naddy flirting, and naturally assume Naddy's a foreigner. The man gets riled up about not letting Japan lose to that, but Naddy giving Rentarou a "stroll hug" has the couple falling on their backs realizing they can't win, completely unaware the entire time that Naddy's as Japanese as they are, she's just all-in on America.
• Dress-Up Episode: A regular feature of the series, usually courtesy of resident costume fanatic Hahari. It's worth noting that typically, no two people wear identical outfits, as they're usually specifically tailored for their wearers:
  • Chapter 32 features the girls in maid uniforms and Rentarou as a butler, while Chapter 102 has only the girls in maid uniforms.
  • Chapter 58 sees everyone dressing up in "freedom outfits" - what they'd want to wear if they had the opportunity.
  • Chapter 65 features the girls in white dresses and flower crowns.
  • Chapter 93 is a downplayed example, featuring everyone wearing glasses.
  • In Chapter 100, Nozawa redraws the whole family in special dresses (the whole family, including Rentarou) as winners of the in-universe popularity poll.
  • Chapter 111 sees Rentarou and Ahko dressing like Wandering Minstrels alongside Uto, and Rentarou and Uto dressing as Gyaru Girls alongside Ahko.
  • In Chapters 116-117, the girls all end up dressing as zombie nurses for a game of zombie tag.
  • Everyone dresses up as Little Bit Beastly cat-people for Chapter 142.
  • Chapter 146 has the girls dress as brides and Rentarou as the groom.
  • Chapter 163 features all the girls dressing as Elegant Gothic Lolitas.
  • Chapter 165 has a vignette with Rentarou, Iku, Uto, and Mai dressing in rental Elaborate University High school uniforms.
  • Chapters 171-173 form a trilogy, with Chapter 171 featuring the stacked girls in ponytails and knit sweaters, Chapter 172 featuring the slender girls in pigtails and pajamas, and Chapter 173 featuring the small girls in hairbuns and overalls.
• Drill Sergeant Nasty: The monk in charge of the Serious Overnight Ascetic Training has this sort of personality, although he never once loses the smile on his face.
• Drink-Based Characterization: Chapter 106 blazes through standard drink orders for the entire harem - much to Chiyo's horror, they're all different and she can't keep track. In general, the more ladylike girlfriends order various teas, while the youngest ones like Kusuri, Chiyo, and Kurumi order fruit juice and sodas. Nano, naturally, takes water, while Uto tries to look cool by ordering coffee.
• Drugged Lipstick: In Chapter 41, the girls kiss Rentarou while wearing Kusuri’s "makes kisses feel extra amazing" lip balm.
• Drunk on Milk: Invoked during the "Drinking Party" that Rentarou hosts. The only drink served is fresh squeezed fruit juice but Rentarou uses the power of suggestion and stagecraft to get everyone feeling drunk.
• Dull Eyes of Unhappiness: Iku after non-tsundere Karane paddles her with a baseball bat, making her the first girl to want Karane back to her old self.
• Early-Bird Cameo:
  • Shizuka and Nano make brief appearances in the first chapter.
  • Mei and Mai both make several brief appearances before their full introductions.
  • Exaggerated with the promotional poster for the first season of the anime. The poster has 20 of the first 21 Soulmates depicted on it, despite the season itself only covering the first five, later six, and having those Soulmates in the foreground with Rentarou. Five of the remaining fifteen would be given cameos throughout the season, while the one omitted from the first 21 was done to avoid Trailers Always Spoil, that being the 6th Soulmate Hahari, who is hidden from view behind Rentarou himself on the poster. The other 10 meanwhile don't appear in the first season at all.
  • In Episode 1 of the anime, Meme, Karane, and Hakari (the latter two with their heads out of sight) can be seen at the high school entrance ceremony, while Kusuri makes an appearance at the end, working in the lab while the narration's declaring Rentarou still has 98 girlfriends to go.
  • The ending of the first episode has silhouettes of all 100 of Rentarou's girlfriends. While a majority are detail-less, the ones near the front are faintly colored in, with all those being colored the girlfriends Rentarou has had in the manga at the time of production (sometime before Himeka was introduced).
  • The ending of Episode 12 features cameos from the next five girlfriends; Kurumi, Mei, Iku, Mimimi and Meme. (While Mei has appeared a few times, it was from the eyes down. It wasn't until this episode we see her fully.)
• Early-Installment Weirdness:
  • For the bonus chapters in the volumes. Volume 1 is a flashback to Rentarou's past, but Volumes 2 and 3 are fanservice chapters, with 2 being a "guess that breast" game and 3 being about Hahari getting some alone time with Rentarou. Volume 4 does another flashback, this time for Mei and Hahari, and subsequent volumes continue doing stories from the characters' pasts.
  • The earlier chapters would do a countdown every time a new girl joined the family, but this stopped happening after the third girl Shizuka joined.
  • Shizuka is introduced to the other girlfriends at the end of her introductory chapter; every subsequent girlfriend (minus Hahari, given everyone was there when the Relationship Upgrade happened) is introduced to the family at the beginning of the chapter after she starts dating Rentarou. Only applies to the manga however, as the anime doesn't have any particular point to introduce the following girlfriend.
  • Up through Nano, only Shizuka's introduction to the harem has anything to do with her specifically (her shyness, in her case); from Kusuri onwards, introductions are consistently themed around the new girlfriend.
  • Four out of the first ten girlfriends (Nano, Hahari, Mei and Mimimi) take 2 to 3 chapters to start dating Rentarou after their first role of relevance. From Meme and onwards, they are always dating by the end of their first chapter.
• Easily Forgiven: As soon as Hahari and Rentarou find out they’re soulmates, she lets them go and everyone forgets that she was keeping Hakari prisoner in her own home and tried to have Rentarou assassinated. Justified due to her backstory, in any case.
• Eating Contest: Kurumi's introduction arc involves Rentarou and the girls participating in one to break in the new member.
• Edible Theme Clothing: In Chapter 58, Kurumi's "freedom outfit" is a macaroon fairy outfit covered in edible macaroons.
• Elegant Gothic Lolita:
  • Matsuri is the family's resident Gothic Lolita, though she wouldn't describe herself that way.
  • Hahari gets all the girls dressed up as Gothic Lolitas in Chapter 163 in preparation for a shower of headdresses.
• Elimination Catchphrase: Inverted. "And so, due to how things panned out, would you guys mind accepting [new girl] as my newest girlfriend...?"
• Elmuh Fudd Syndwome: The Teddy Babies talk this way. Justified, as they're supposed to be, well, teddy babies.
• Ensemble Cast: The titular girlfriends. Different chapters give different amounts of attention to different girls, with all of them on equal footing no matter how long they've known Rentarou.
• Entertainingly Wrong:
  • In Chapter 73, a TV reporter decides to interview the girlfriends about their boyfriends, unaware they all have the same boyfriend, and the girlfriends don't bother correcting her.^note They only mention Rentarou by name once, and none of them say anything to imply he’s dating more than one of them. She's left thinking their boyfriends are monsters, when in truth Rentarou is just Like That. Then Rentarou himself pops up and she decides to interview him... and he describes the girlfriends as if they're one girlfriend.
  • In Chapter 128, Yaku doesn't realize she's been sorted with the players instead of the guardians the entire chapter (she thought she was entering as a guardian alongside the players for some reason, not realizing she'd been mistaken for a player).
• Epic Fail:
  • The kissing game in Chapter 2 leads to numerous embarrassing fails involving Accidental Pervert moments with Hakari and mistaken for pervert moments with Karane. In the anime, Rentarou almost falls off the roof during one attempt.
  • In Chapter 76, Yaku doesn't match a single one of the girls correctly with their personalities or physical traits. Some of her wrong guesses involve giving them traits that require things they don't have in the first place.
  • Ahko manages to bring down a Jenga tower on the first try twice in Chapter 162.
• Establishing Character Music: The first five girlfriends all get pieces of music reflecting their personalities in their introductory PVs.
• Everyone Has Standards: Takeko Deluxe the professional eater will refuse to participate in an Eating Contest if the food is too disgusting, calling it "an insult to food." Though it turns out she's just chickening out of tasting the ultra-hot curry.
• Evolutionary Pressure Cooker: Played for Laughs in Chapter 96. The chapter starts with Hahari buying an expensive vase that she thought Yaku would like, which turns out to be too big to fit inside the school building. She ends up stuck inside it along with Iku, Kusuri, Kishika, and Momiji, which the narrator dubs as a Gu ritual.
• Evolving Credits: A rare print version. The contents pages in the volumes add chibi girlfriends either when they're introduced or when they first appear on the cover.
• Evolving Music: The single for Season 1's OP comes with seven alternate versions of the OP, six solo versions done by the voice actors for Rentarou and the first five girlfriends and one instrumental. The versions done by the girlfriends' VAs all have different second and third verses matching each girl's personality and quirks.
• Exactly What It Says on the Tin:
  • Yes, the series is about someone who will eventually have 100 girlfriends.
  • Within the manga, the Yakuzens' drugs are named after what they do when used.
• Excited Title! Two-Part Episode Name!:
  • The chapter titles in the Eating Contest mini-arc use this format in the original and the scanlation, though not in the official translation, which just has excited titles.
  • Chapter 153 also uses this format in the original and scanlation.
• Excuse Plot:
  • While the series has Rentarou actively avoid breaking his girlfriends' hearts, the whole "if your soulmates are heartbroken after meeting them, they'll die" clause that led to him going above and beyond for them only threatens to fulfill itself on the following occasions:
    • When Hakari attempts suicide when her mother tries to end her relationship with Rentarou.
    • When Tama is revealed to be on the brink of starvation after quitting her job and running out of money.
    • When Himeka nearly gets trampled by the judo club after trying to reject Rentarou as a boyfriend.
  • And if a girlfriend does initially reject Rentarou, it's either because they haven't gotten shocked yet, because they're fighting their feelings and will give into them later, or because it turns out they secretly like being hurt. Rentarou eventually addresses this when he talks to the Love God seventeen girlfriends later, saying that he'd rather make his girlfriends naturally want to be in the relationship rather than them staying only because they know they'd die if they reject him after locking eyes with him.
• Explain, Explain... Oh, Crap!: In Chapter 137, Mai explains that she was responsible for adding the Youkai Research Club's haunted house competition to Hahari's schedule, only to suddenly realize that she posted the reminder for the wrong week due to being distracted by Mei.
• Extremely Short Timespan: Nearly the entirety of Volume 3 takes place over the course of a single day.
• Eye Pop: Almost Once an Episode, someone will have this reaction to something shocking happening.
• Eyes Always Shut: Mei has kept her eyes shut for so long she has forgotten how to open them. It's also the reason why she doesn't become a soulmate for several chapters after her introduction, as she didn't look Rentarou in the eye. Despite that, she's able to drive a car.
• Eye Scream:
  • In the second chapter, Rentarou first gets a cookie, and then a Bocky stick, accidentally jammed into his right eye by Karane.
    Rentarou: (You got a grudge against my right eye or something...!!!?)
    • By Chapter 48, he seems to have gotten used to being poked in the eye.
  • Nano inflicts this to protect against harassment on more than one occasion.
• Failed Attempt at Scaring: Played for Laughs. Shizuka uses her text to speech app to try and scare Mei into opening her eyes. Rentarou's Comical Overreacting gets a bigger scare from the others.
• Fake High: One of the Serious Group's products is Serious Kids Beer, a non-alcoholic beverage that simulates drunkenness. It first appears in Chapter 98 as part of the Kiraisugi-chou mayor's plan to sabotage the sports festival, and Rentarou intends to serve it to his girlfriends during a sleepover in Chapter 109, only to be overruled by the Big Cheese of the Publishing Biz.
• False Soulmate: Exaggerated. The first chapter establishes that Rentarou confessed to 100 girls by the time he graduated middle school (the first time being when he was 8 months old), and every single one of them rejected him. It's only after his 100th rejection that he learns of his titular destiny.
• Familial Chiding:
  • Hakari has a tendency to be annoyed at her mother whenever she does something of an especially perverted nature.
  • Chiyo can hardly stand her father playing Shipper on Deck with her and Rentarou.
  • Kusuri doesn't usually have a problem with her dad, but she's as annoyed at him as Chiyo is with hers whenever their dads argue over who's daughter is the better match for Rentarou.
• Family of Choice:
  • Rentarou names the harem "Rentarou's Family" in Chapter 14, framing how he sees them - they're just as much a family as they are a harem. The girls collectively react with a hngh!.
  • As far as Hakari's concerned, she and Mei are family, raised in the same home.
  • When the first 25 girlfriends are asked to imagine married life with Rentarou, they end up imagining it with all of them together, and decide they'd be happy with that. However, when they realize only one of them can actually be married to him as things currently stand, they're sent into collective depression, until they discover he's committed to making Marry Them All happen one way or another, but only if none of them would prefer a two-person marriage with him - and they all agree a collective marriage would make them happiest.
• Ferris Wheel Date Moment:
  • Rentarou and Nano ride a Ferris wheel on their first date in Chapter 7.
  • Rentarou and Chiyo ride a Ferris wheel during their solo date in Chapter 126.
• Fetishes Are Weird: Rin is ashamed of being a Nightmare Fetishist, for obvious reasons, and can’t believe that, after successfully keeping this a secret for years, she reveals it accidentally to the boy she likes. Fortunately for her, that boy is Rentarou, who loves any girl and tells her as long as it isn’t hurting anyone, it is nothing to be ashamed of.
• Fictional Counterpart:
  • Volume 1's extra page for Chapter 3 has an Amazen webpage, which in the anime becomes Amaama.
  • A 6-11 shows up in Chapter 24 and a 7-Heaven is mentioned in Chapter 124.
  • In Chapter 162, Ahko's been watching BooTube.
• Fictional Document: Shizuka is a fan of "Circlet Love Story", a romance novel about a princess named Io and her beloved knight Kamacle. When Rentarou confesses his love to her, she sees herself as the princess and him as the knight.
• Finagle's Law: Invoked in Chapter 80 via Reverse Psychology. Rentarou and the girls make out on the summit in order to bring clear weather to the mountain.
• Finger-Forced Smile: In Chapter 102, Nano and Momiji push each other's lips into smiles due to being unable to smile on their own.
• Five-Second Foreshadowing:
  • Near the end of the paper balloon sword fight in Chapter 82, Mei declares Kishika the winner. But Rentarou was the referee for the match, and as Kishika attempts to kiss Rentarou, Hahari bursts her balloon.
  • In Chapter 42, the Hanazono family car is out of the tentacle hair's grasp, which Nano muses is because Hahari doesn't lust after a purely inorganic contraption, and Karane mentions that if it had anime characters all over it, they'd be well and truly screwed. The fourth wall seems to have been preserved for a brief moment.
• Flag Bikini: Hakari wears an American flag bikini during an Imagine Spot in Chapter 76.
• Fooled by the Sound:
  • In volume 3's extras, a scene during the infiltration of Hanazono mansion is shown in which Shizuka, Nano, and Kusuri hide and imitate meowing to make the gaurds think it's just the cat. Shizuka's text-to-speech app uses a passage about meowing rather than the sound. It still fools the guard.
    Nano: Meow.
    Kusuri: Nyawr!
    Shizuka: "Mewling could be heard."
    Guard: Tsk, that cat again?
  • The extras go on to show a second scene in which the girls try to talk a Driven to Suicide Hakari out of doing something drastic while not giving away their position:
    Guard: Don't do it, young ladyyy!
    Nano: Meow! Meoow!
    Kusuri: Nyaa! Nya-nyaaa!
    Shizuka: "You meowst keep living!" "You meowst!""
    Guard: This isn't the time for your yowling, you stupid cat!
• Footnote Fever: One of Rentarou's plans to proceed with the pretend drinking party of chapters 109 and 110, after it's vetoed by the Big Cheese of the Publishing Biz, is a footnote reading "No alcohol or anything with similar effects has been consumed" to tack on to any panels in which characters appear drunk. This footnote then appears on nearly every single panel for the next chapter and a half.
• Forceful Kiss:
  • The vice principal of Rentarou's school has a reputation for kissing students as punishment for breaking the rules, especially running in the halls.
  • Hakari and Karane both tried to do this to Rentarou in Chapter 2 to try and get his Sacred First Kiss before Rentarou explains his Zany Scheme for resolving the issue.
  • Rentarou tries to do this with Yaku in Chapter 75, only to stop when he's just millimeters away from her lips, as he can't bring himself to steal a woman's lips. It's Yaku herself who decides to close the distance and kiss Rentarou.
• Foreshadowing:
  • Hakari claims in Chapter 2 that her household checks body temperature through kissing. Seeing what her mom is like suggests that she may not have entirely made it up as an excuse to kiss Rentarou, and Chapter 171 confirms that this is indeed the case.
  • Chapter 33:
    • Iku gives Rentarou a massage after he helps her with recruiting calls for the baseball club, even though Rentarou feels that Iku needs one more than him. As we see in Chapter 70, when Momiji massages all of her muscle pain away, Iku had her reasons for not wanting a massage.
    • Rentarou mentions that while he had seen Iku soliciting club members before, they hadn't actually made eye contact until that point. This would be far from the last time this scenario would play out with Rentarou's girlfriends.
  • Meme mentions in Chapter 46 that she can perform escapes on par with an escape artist if she gets embarrassed enough. She invokes this in Chapter 77 to get out from under a powerful water hose.
  • In Chapter 52, Chiyo shows Nano a copy of a volume from the manga itself to prove that heaven exists. In Chapter 61, a bookstore display can be seen with copies of volumes of the manga for sale.
  • In Chapter 54, all the girls go into withdrawal when Chiyo forbids them from kissing on school grounds. This sets up how Rentarou breaks their addiction to addictive cabbage in Chapter 107.
  • The trope name is mentioned in Chapter 58, when Shizuka hopes that Hahari's remark about letting herself be taken in by a cute police officer upon seeing Chiyo's "freedom outfit" is not an example of the trope itself.
  • In Chapter 66, two girls pull out items submitted by Mimimi during the hot pot party. This hints that one girl's entry will be unaccounted for by the time everyone has taken their turn.
  • In Chapter 119, Kishika approaches Rentarou thinking he isn’t actually Rentarou. As it turns out, it’s actually Momiji in Rentarou’s body who’s groping all the girls.
• Formula-Breaking Episode: Normally when Rentarou gets a new girlfriend, it’ll start with a Love at First Sight shock followed by Rentarou getting to know her, then in the next chapter introducing her to the rest of the harem with his Mad Libs Catchphrase, after which the new girl integrates herself into the group. In the case of Usa-chan, she’s introduced mingling with the other girls followed by Rentarou catching a Zing with her, after which he gets to know her and then recites his Mad Libs Catchphrase.
• Fractured Fairytale: Chapter 82.5 (a special chapter released in a one-shot spinoff of the main series' magazine) is a collection of these mashed together and obliterated by RentaRomeo.
• "Freaky Friday" Flip:
  • Courtesy of one of Kusuri's drugs in Chapter 23.
  • It happens again as a set of Imagine Spots in Chapter 76.
  • Chapter 119 has this happen with Rentarou and Momiji courtesy of the drug from Chapter 23.
  • Chapters 148-149 have all the girls switch bodies like in Chapter 23.
• Freeze-Frame Bonus: In the OP, the Locker Mail letters the girls leave for Rentarou are all fully legible, despite only appearing on-screen for a couple of seconds. Fortunately, the subs provide translations.
• Friendless Background: A recurring theme with the girlfriends is that most of them have very few friends if any.
• Friend to All Living Things: Yamame can make plants bloom just by holding them, and constantly has butterflies and squirrels on or around her.
• Funny Background Event: A Running Gag in the series is someone having a fainting spell that involves their spirit leaving their body, whereupon a fellow haremette has to slam the spirit back into the body.
• Furo Scene: In Chapter 134, Nano shares a bath with Shizuka to get her to open up about what's bothering the latter.
• Gag Censor: Used all over the place. Of particular note are appearances from the series artist, featuring her as a giant mass of privacy-protecting Pixellation. By convention, the manga also depicts any vomit as a stream of shiny sparkles; this is lampshaded in one chapter where Kusuri invents a drug that literally turns vomit sparkly (only to be told the artist is way ahead of her).
• Gag Series: Along with having No Fourth Wall, this manga heavily parodies the harem genre and its tropes.
• Game Face: The characters get these whenever they set out to enter a competition as "Rentarou's Family".
  • Mei's eyes have opened outside of Oh, Crap! moments when she's donning a Game Face.
  • Iku makes such a face almost all the time, except when utterly exhausted.
• Gentle Giant: Yamame Yamashiki is 200 centimeters tall and a friend to all living things. Her name literally means "Kindness Mountain Woman".
• Get A Hold Of Yourself Man: Hakari gives Karane this sort of slap in Chapter 77, when Karane refuses to leave the breast enhancing bath.
• Giving Up the Ghost:
  • A Running Gag in the manga, which prompts a fellow haremette to slam the ghost back into the original body. (Usually Hahari loses her ghost, and Mei restores her.)
  • The entire harem gets a blissed-out version at the end of Chapter 77 courtesy of a "Serious Paradise Bath" at an onsen. In an Omake, the ghost of Father-in-Law plays goalie at the gates of Heaven and sends them back to Earth.
• Glasses of Aging:
  • Parodied with Kusuri. She can temporarily age herself up by neutralizing the immortality drug in her system. Her older form has poorer eyesight than her younger form, so she wears glasses when she's aged up.
  • Inverted with Chiyo, who is the youngest of Rentarou's girlfriends (so far) but is one of the few girlfriends to need glasses to see.
  • Suu is a parodied inversion. While she wears glasses and is around Rentarou's age, she looks young enough that she's able to participate in a competition for children.
• God Is Flawed: The whole situation is due to the God of Love being distracted by anime.
• Gone Horribly Right: The Volume 5 extras reveal that Iku's older brother didn't want her to develop a quitter's mentality after being exhausted with baseball, so he told her that the fact that she worked hard and had the muscle ache to show for it meant she was improving. Iku then started associating pain with goodness, and later, pleasure, to the point where she started using the family fan to hit herself.
• Gonk: The Vice Principal and the Gorira Alliance.
• Gotta Catch Them All: 100 girlfriends, that is.
• Grand Romantic Gesture: Deconstructed in Hahari's backstory. She had Hakari so that she and her boyfriend could be a family before his death. She makes it clear in hindsight that it was a terrible decision no matter how much she loves her daughter that was born out of impulsiveness and poor decision-making. Before joining the harem, she saw it as part of her duty as a mother that Hakari would do nothing similar to avoid ruining her own life.
• Gratuitous Laboratory Flasks: The Yakuzen residence is filled with these, including an enormous vat of neutralizer drug.
• Great Accomplishment, Weak Credibility: Uto claims that her first words as a baby were her singing a song while playing the ocarina. Karane accuses her of telling Blatant Lies.
• Groin Attack: In Chapter 47, Rentarou mentions that the chastity belt he is wearing will tear his groin to shreds if he starts getting erect.
• Gyaru Girl: Aashii "Ahko" Kedarui, introduced in Chapter 87. Self-described as a low-blood pressure kinda girl (which is rare for gyaru girls), Ahko speaks with modern slang, and talks fairly sluggishly. She loves moments when she can share the same feelings with others, especially when mutually appreciating cute things like toys and keychains.
  • Because of Ahko's low-blood pressure and slowness, she doesn't over-exert herself when expressing herself, which makes it hard for her to maintain friendships because people misinterpret her as being bored or uncaring. But all she wants to do is share the same feelings with other people, which Rentarou successfully helps her with.

H-K

• Hair Intakes: Hakari, Karane, Shizuka, Kusuri, Yamame, Yaku, Tama, and Himeka. Four out of the first five girls have intakes (aside from Nano), and it's popped up occasionally since.
• Hand Gagging: Kishika does this to Kusuri in the Chapter 125 bonus page when she starts explaining that she hadn’t been drugged to act like a baby.
• Handwriting as Characterization: Yaku's handwriting consists of an ancient form of Japanese writing that gets dubbed "chicken scratch from hell". Which makes sense, as she's an 89-year-old Yamato Nadeshiko. The only other person able to read it is Naddy, who lived a Yamato Nadeshiko lifestyle in her youth before she became a reverse Occidental Otaku.
• Harem Genre: Well, yes, being an Affectionate Parody. However, Will They or Won't They? gets tossed out the window from the beginning - Rentarou gets into active romantic relationships with all the girls, but sex is off the table until they're all ready. Lacking the usual themes of the genre, the series instead goes all-in on the harem's wacky hijinks, with a side order of seeing who joins the harem next.
• Hated Item Makeover: In Chapter 53, Chiyo rearranges the badges that Kusuri pinned to her book bag. Kusuri doesn't want Chiyo messing with her stuff and is about to remove Chiyo's glasses to make her cry before realizing she was just arranging them in a neat order.
• Headphones Equal Isolation: Kurumi wears big headphones to avoid hearing anything that would trigger her food obsession.
• Heavier than It Looks: Invoked in Chapter 67. Kusuri uses a drug on herself to make herself a lot heavier without getting bigger in order to get an edge over Rentarou in the sumo wrestling tournament. Unfortunately for her, the floor buckled under her new weight and she fell through.
• Helping Granny Cross the Street: Rentarou carries Yaku on his back while crossing the street in Chapter 85 due to the latter's fear of cars.
• Here We Go Again!: Chapter 24 ends with Kurumi craving yet another kind of Japanese food.
• Heroic Sacrifice:
  • In Chapters 42 and 43, each of the (at the time) current girlfriends (except Hahari) perform non-lethal sacrifices while escaping from Hahari's tentacle hair:
    • First Kurumi pushes Mei out of the way of the hair strands, and gets caught.
    • Then Kusuri throws herself at the strands (after giving Shizuka the rest of her drugs) in order to buy time for the others to escape.
    • Then Hakari pushes Karane out of the way of the strands and is ensnared.
    • Then Karane and Iku get out of the car the group is using to escape in order to push it to safety. Karane is able to help Iku escape by hitting her with a baseball bat and causing her to land on the roof of the car, but is unable to escape herself.
    • Then Iku grabs hold of the strands in order to clear a path for the others and is caught.
    • Then Mei and Shizuka lure the strands away from Rentarou, Nano and Mimimi by having Shizuka drink a drug that gives her rabbit ears, causing the strands to target her because of her cuteness (although this ends up subverted when they appear just fine in the next chapter).
    • And finally, Nano and Mimimi stay behind to distract the strands from Rentarou, who is escaping so that he can find and help Hahari.
  • In Chapter 80, Kusuri performs a non-lethal sacrifice when she pushes Chiyo out of the way of a falling branch and gets hit instead.
  • Parodied in Chapter 117: during a game of zombie tag, Hahari throws herself in front of Rin to prevent zombie Kurumi nomming on her... because she wants to be the one Kurumi noms.
• Hired on the Spot: Naddy got hired as a teacher at Rentarou’s school by walking into the chairwoman’s office and Hahari accepting her because she thought she was cute.
• Hoist by His Own Petard: The mayor of Kiraisugi-chou switches out Sukisugi-chou's juice with Serious Kids' Beer in order to gain an advantage in the relay race. But because Mei provided refreshments for Rentarou's girlfriends, they're the only ones who don't drink it. As a result, the mayor's additional cheat attempt of oiling the girls' baton backfires spectacularly, since the other teams' batons get oiled by accident, and the girls are able to exploit the chemistry between them to handle their baton better than the other teams.
• Honest Axe: In Chapter 82.5, "Haharmes" offers the woodcutter a choice between a platinum axe and a diamond axe.
• Honor Thy Parent:
  • For all her drunken hedonism, Momoha is a firm believer in paying back what's owed. To this end, she sends as much of her earnings as she can to her parents before she blows it all on gambling and booze. Her parents would actually prefer Momoha not do this and be more independent, and kicked her out of the house to facilitate this; this doesn't stop Momoha.
  • In chapter 157, Hakari honors her mother Hahari with a mother's day gift: She uses Kusuri's body swapping drug to switch places with Kishika; Hahari is then essentially given permission to baby Kishika-in-her-daughter's-body to her heart's content. As the scene escalates, the actual Hakari can only cringe in embarrassment as Mei praises her filial piety.
• Horrifying the Horror:
  • Chapters 136 and 137 feature the girlfriends pairing off and entering the school at night to seek out Rentarou after he vanishes inside of it and encountering various Youkai. The girls' reactions range from scared as expected, not scared at all, not even realizing they're encountering monsters, and one instance of taking selfies with them. Of those that scare the monsters themselves are Iku, who presents her behind to a kappa daring it to take the shirikodama that it's demanding and is supposed to be in humans' bottoms, Chiyo, whose OCD-induced cleaning brings a trash-loving youkai to tears, Eira, who is unafraid of the ghost she and Uto encounter because she believes she can take it out with a kick, Meme, who scares a slit-mouth woman when she flees the scene with her Ninja Log trick, and finally Rentarou himself, who charges to the rescue in a full-on Unstoppable Rage when he hears baby-mode Kishika crying. It is at this point it's revealed that the youkai were themselves students, practicing for a haunted house.
  • In chapter 164, Matsuri makes a wish that the festival she's at with Rentarou and some of the other girls would never end. The shrine's god grants the wish, but plays Jerkass Genie by forcing everyone to only want to enjoy the festival so they won't want to leave, even though it means ignoring their own preferences and passions. When the horror at what she's caused starts to make Matsuri cry, Rentarou appears and, with a big smile plastered on his face from the god's power, threatens to kill the god and burn down his shrine for making Matsuri cry. The terrified god begs forgiveness and undoes his spell on everyone.
• Human Jungle Gym: In Chapter 58, Mimimi’s “freedom outfit” is big enough for Iku to use for climbing, much to the former’s chagrin.
• Human Shield: Both Rentarou and Kusuri take turns serving as this to each other in Chapter 74.
• Hypno Pendulum: In the Volume 8 extras, Yamame believes her stilt-walking lessons came from the ghost of an insect she accidentally stepped on as a child, because her father hypnotized her when she refused to go outside after the incident.
• Hypocritical Humor:
  • In the first chapter, Rentarou is shocked that Hakari and Karane have spent four hours looking for a pink four-leafed clover, even though he himself spent the same amount of time looking for a teacher's contact lenses. In the same chapter, Karane scoffs at Rentarou for believing the school rumor that confessing one's love while holding a pink four-leaf clover will guarantee a successful confession, even though both she and Hakari spent four hours the previous day looking for pink clovers before confessing to Rentarou.
  • In Chapter 30:
    Hahari: Meido may occasionally be diligent to an outright dangerous degree...
    Kusuri: What would you do if you were asked to drink potassium cyanide, yep?
    Mei: I would pour it down the hatch.
    Nano: You seem pretty much like an android.
    Karane: You're not one to talk.
  • In Chapter 48, Hakari scolds Hahari for wanting to smooch the currently not-tsundere Karane, claiming that it would be going too far, but is perfectly happy to let Karane grope her breasts.
  • When Rentarou's cousin Chiyo is added into the harem and he explains that he got his uncle's blessing for it, Hahari is shocked that a parent would let his underaged daughter be a part of something like this.^note Granted, she only let Hakari continue dating Rentarou after the latter passed a Lie Detector test and then risked his life to save Hakari.
  • While watching Kishika getting a piggyback ride from Rentarou in Chapter 85, Karane comments "She's way too easy.". Mimimi, Momiji, Nano, Meme, and Mei give Karane, who's notorious for giving in after loudly protesting, a Look.
  • In Chapter 151, Himeka remarks that Shizuka, Meme, Chiyo, Eira, Kurumi and Suu look pretty run-of-the-mill, before a gust of wind blows in a porn mag, a flying squirrel, the scent of curry, and a zero-yen cell phone flier, just the combination to set off their respective quirks.
• Idiosyncratic Cover Art: Has two cover formats for the volumes. The primary cover format features two of the girls in the order they became Rentarou's girlfriends, with Kusuri's dual forms counting as two for this (so volume 1 is Hakari and Karane, volume 2 is Shizuka and Nano, volume 3 is Kusuri's dual forms, volume 4 is Hahari and Kurumi, etc.). The secondary cover format is a Team Shot of the current girlfriends (or covers that form a Team Shot when put together), usually used when they've outpaced the available pairs and need to let them build up again. The back covers all show Rentarou reacting to the scene on the front, with the pair covers including the featured girls (even the two Kusuris) and the group covers having Rentarou solo.
• Imagine Spotting: During Chapter 76, Hakari notices the Imagine Spot Yaku has about Chiyo (where she mistakes the girl for a masochist) and reacts with horror at seeing Chiyo tied up, stating that such a thing isn't legal for such a young girl.
• I'm a Humanitarian:
  • In Chapter 56, Rentarou dreams about Kurumi eating him.
  • In Chapter 84, Kurumi has to remind herself that babies aren't food.
  • In Chapter 139, Rin imagines Rentarou violently biting into her.
• I'm Standing Right Here: When Rin is introducing herself to Rentaro's Family, Mimimi remarks that, at last, a natural-born, prim and proper lady has arrived. Standing right next to Mimimi as she says this is Hakari, who points out that she's right there. The narration also points out Naddy, however she doesn't seem to care about the conversation. The very next page Nano calls Rin a respectable human being, with Hakari following up that it's been a while since they've had one of those, prompting Mai to pipe up and say her own addition wasn't so long ago.
• Inconsistent Dub: A minor example from the official manga translation: the sound effect for the soulmate shock is KRA-KOOM!! in Volume 1, but DA-DUUUN!! thereafter.
• Incredible Shrinking Man: Nano falls prey to this thanks to Kusuri's drugs in Chapter 72. It wears off by the end of the chapter.
• Indignant Slap: During a pop idol training session, the instructor Tina gives Hahari a Get A Hold Of Yourself Man slap, prompting her maid Mei to slap Tina across the face right back.
• Indirect Kiss:
  • Hakari attempts to invoke this in the first chapter, when she convinces Rentarou to drink half of the can of juice he brought for her. It fails because she accidentally spills the juice down herself.
  • Rentarou later invokes this in Chapter 107 by telling Mai that the last person he kissed was Mei. He later realizes that, by that logic, all the girls have indirect kisses with each other every time they kiss him.
• Infantilization Retaliation: In Chapter 84, Kusuri tries to get Kishika to take a baby transformation drug by acting as though the latter were a toddler refusing to take her medicine. This leads to Kishika smacking the vial out of Kusuri's hand with a kendo sword, causing the drug to envelop all the girls who weren't babyfied in the first Baby Morph Episode.
• Instant Costume Change:
  • When the group plays Zombie Nurse Tag to welcome Rin to the harem, the four designated zombie nurses got costumes made by Hahari and makeup by Ahko, but whenever any girl gets tagged and turned into a zombie nurse, she instantly gets changed into a nurse costume and bloody makeup even though it is not possible for Hahari and Ahko to have done so, since they too were playing. (In fact, Ahko herself gets tagged.)
  • Earlier, when the popularity poll results came in, everyone appeared in a new fancy dress in the panel where their placement was revealed, but in that case it was justified since Nozawa-sensei drew the characters like this, with them knowing ahead of time.
• Instant Taste Addiction:
  • Exaggerated. Kurumi will start craving a food whenever she sees or hears anything that bears the slightest resemblance to it or its name.
  • When Rentarou’s Family goes to a yakiniku restaurant, they discover too late that the addictive cabbage is just that—anyone who eats it desires nothing else.
• Internal Homage: The end of S1 is a homage to the opening credits, complete with a version of the OP, but with Early-Bird Cameos of the girlfriends from Kurumi to Meme along Rentarou's run to school rather than the original five, and ending with Rentarou arriving on the roof to find Hahari's joined the group.
• Internal Reveal: Rentarou is the only member of the main cast who knows the supernatural is real up until Chapter 164, when Matsuri has a run-in with a God of Infinity. He'd previously tried telling Himeka he'd met a god while trying to convince her he was abnormal, but she dismissed it as being like everyone else who claims they've met a god.
• Ironic Echo:
  • Two cases involving Kurumi:
    • Rentarou first meets Kurumi at the school store despite her attending the middle school and not his high school, to which she says, “there’s no rule that says a middle schooler can’t go to the high school side store.” Later, when she is searching all over the place for a menchi-katsu sandwich, she sees Rentarou at her school store, and when she objects, he says, “there’s no rule that says a high schooler can’t go to the middle school side store.”
    • Kurumi and Hakari are paired off during baseball practice, and when Kurumi's pitch hits Hakari in the chest, she yells at her, "How exactly are you catching it?!" Hakari throws it back and it lands on the ground, and Kurumi becomes reminded of the chocolate baseballs she used to eat as a kid, getting her so hungry that she lies on the ground and bites into the baseball, causing Hakari to retort the same thing.
  • When Ahko tried to support one of her friends after one of them was dumped by saying, "I'm like, toootally pissed off," her friends assumed she wasn't taking it seriously because of her expression. Later, after refusing to bail them out of trouble, Ahko says the same thing with the same expression when talking about how mad she is at them for insulting Karane.
• Irony: Two instances occur with Chapter 118:
  • The chapter features Miss Naddy in trouble with a senior teacher because her way of speaking makes her incomprehensible to the students she's supposed to be teaching classical Japanese. To test the harem's claim that they can understand Naddy just fine, the teacher giving the warning has them translate a lesson Naddy gives into proper Japanese. Everyone manages it except Yaku, who instead writes a letter declaring how much she values Naddy's friendship and requesting the senior teacher forgive Naddy her quirks. The letter brings Naddy herself to tears and makes the teacher rescind the warning. The irony of the situation becomes clear when everyone else sees the letter and the traditional calligraphy it's written in is illegible to everyone except Naddy, who grew up around similar writing. Uto posits the senior teacher rescinded her warning to Miss Naddy, given based on the belief students couldn't understand her, rather than admit she couldn't read Yaku's handwriting.
  • The irony of chapter 118 increases when a volume extra for the chapter shows that Naddy's students' grades have not only improved, but have done so because of Miss Naddy's speaking style rather than in spite of it. The students have to put more focus into the lessons in order to parse what Naddy is teaching them, and in fact became bored when she was forced to speak normally during the chapter's events.
• I Take Offense to That Last One: Chapter 125 features an argument between Kusuri and Kishika. At one point Kusuri storms off yelling insults at Kishika directed at her tendency towards Emotional Regression. The only one Kishika objects to is the last one, because it is actually a bad habit of Kusuri's:
  Kusuri: You big dummy! You whiny brat! Thumb sucker! Adult baby! Boob licker! Panty wetter!
  Kishika: That one is pure projection!
• It Began with a Twist of Fate:
  • Rentarou being destined to have 100 soulmates happened because the God of Love was distracted by a pivotal scene in Castle in the Sky.
  • Rentarou only meets Nano because he forgets his phone in the classroom, thus forcing him to go back for it and leading him to meet her.
  • Kusuri forgetting her bento one day triggers a sequence of events that culminates in Rentarou and his family saving the baseball club from being disbanded:
    • Rentarou gives Kusuri his bento and goes to the store to replace his meal, where he meets his 7th girlfriend.
    • Said girlfriend is a Big Eater, so Rentarou signs up the family for an Eating Contest to break in the new girlfriend.
    • In the aftermath of the Eating Contest, the girls have put on considerable weight, leading them to secretly working out.
    • By the time the girls realize their struggles with their exercise regime, Rentarou has acquired two new girlfriends, one of whom is the last remaining member of the baseball club, which is facing disbandment due to all the other members studying abroad. Desperate to shed the extra pounds without raising suspicions, the other girls agree to help save the baseball club.
    • The girls' antics, combined with Rentarou's astute observations of the opposing team's pitcher and him identifying Iku's Trauma Button before the final play of the game, enables them to counteract the opposing team's cheats and win the game.
• It's Always Spring: It's occasionally lampshaded that spring never ends in this manga.
• "Just Joking" Justification: Hahari claims that asking Rentarou to go out with her was just a "mom joke". She's lying.
• Killing Intent: Averted in Chapter 117. Nano is in the middle of declaring she can pick up on any killing intent, no matter how brief, when she unexpectedly finds herself being nommed by zombie Shizuka, thanks to Shizuka not having any killing intent in the least.
• Kiss of Life:
  • Inverted when Rentarou falls unconscious at the pool. Nano and Hakari's attempts at mouth-to-mouth turn into regular kissing and they need to find someone else to do it.
  • Played straight in Chapter 67, when Hahari gives Rentarou mouth-to-mouth after suffocating him with her breasts in order to win the sumo match (It Makes Sense in Context).
• Kuudere: Nano Eiai, who is obsessed with efficiency and rarely smiles. The other characters liken her to an Artificial Intelligence ("A.I." having the same pronunciation as "Eiai").

L-O

• Lap Pillow: The girls take turns letting Rentarou use their laps as pillow in Chapter 56, ultimately culminating in using all their laps to make a bed for him. He ends the chapter dreaming that his lap is serving as a pillow for all the girls.
• Laser Hallway: One is part of Hahari's security system. The lasers are arranged so there are not enough gaps for a human to fit through, so Rentarou and Karane have to go over them to get past.
• Last Episode, New Character: In addition to being the proper debut of Mei, the last episode of the anime's first season would give early bird cameos to four more of Rentarou's future soulmates, Rentarou passing them as he runs back to school. Specifically, Kurumi leaving a convenience store, Iku practicing her swing, Mimimi admiring her reflection, and Meme walking past the stairwell.
• "Last Supper" Steal: Chapter 65 has a panel where all the girls are feasting on cucumbers and tomatoes, and Rentarou wonders if he's looking at a painting.
• Late-Arrival Spoiler: Downplayed. The manga doesn’t bother to hide the harem’s more surprising members or their relationships with the already existing characters, but the vast majority of the girlfriends are only introduced right before or at the exact moment they fall in love with Rentarou. The only time this causes problems for latecomers so far is the fact that Hakari's mother being one of Rentarou's soulmates spoils the resolution of Volume 3.
• Late to the Realization: Downplayed in Chapter 168. The girls are confused as to why they don’t know one of the girls sharing pictures with them, but it isn’t until Rentarou fails to recognize her that they realize she shouldn’t be there.
• Lawyer-Friendly Cameo: One chapter focuses on Rentarou and his girlfriends playing with little toy animals that strongly resemble the Sylvanian Families line. Rentarou then helpfully mentions that these are mix-n-match toys with a mafia theme called Nirvana Families, and are in absolutely no way the same as Sylvanian Families.
• Lie Detector: Hahari uses one in Chapter 18 in order to confirm that Rentarou's feelings for Hakari are genuine. She uses it again in Chapter 66 to ensure that nobody brings anything questionable to the hot pot party.
• Liquid Courage: Parodied in Momoha’s introductory arc, which has Rentarou and the girls Playing Drunk:
  • Karane is notably less flustered than normal, Meme isn't compelled to use her Ninja Log for quite a while, and Chiyo is much more relaxed about things that would trigger her OCD, being more prone to laughter than snarling.
  • Inverted with Iku, who is more reluctant to engage in painful activities than she normally is.
• Literal Ass-Kicking: Invoked in Chapter 133. Iku challenges capoeira master Eira to a balloon duel, where the objective is to pop a balloon on your opponent. Iku tapes her balloon to her butt.
• Literal Metaphor: Rentarou thinks that he'll die from rejection; the 100 girls will actually die should he reject them or be separated.
• Locked Out of the Loop: Rentarou has no intention of telling any of his girlfriends that they'd die if they couldn't be together with him, because he doesn't believe that their love would be genuine if they knew.
• Locker Mail:
  • Meme leaves a note and a plushie in Rentarou's shoe locker the day after their first face-to-face meeting.
  • The OP features the first five girlfriends leaving letters in Rentarou's locker inviting him to meet them on the roof for lunch.
• Long-Runners: While the manga has only been running for four years so far, even the best case estimates predict a serialization well beyond ten years before the final girlfriend joins the harem, with some estimates projecting an over 20 year quota meeting. And even then, there’s no telling what will happen after the harem gets full.
• Look, a Distraction!:
  • In Chapter 53, Hakari distracts Karane by shouting "Look! A breast-enhancing bra!" in order to sneak a look inside her backpack.
  • Rentarou diverts everyone's attention to the beach so that he and Chiyo can kiss atop the lighthouse without being watched.
• Lost in Translation: Chapter 76 is filled with Japanese puns that don’t translate into English, so the jokes in the scanlation are completely different from the original ones.
• Love at First Sight: The God of Love describes meeting your soulmate as a shock running through your body and falling in love so hard that it hurts. Sure enough, it happens when Rentarou meets Hakari and Karane, as well as the other girls.
• Love Freak: Rentarou. He says he first fell in love at eight-months old, was rejected 100 times before high school, and his favorite hobby is reading romance books. In his own words, each girl he meets is like discovering a new oil well full of love.
• Love Potion: Kusuri gives Rentarou tea spiked with love potion when they first meet. He's so disgusted at the thought of confessing his feelings under the influence of a drug that he tries to vomit it out.
• Loving Details: In Chapter 4, Rentarou discusses his girlfriends' Character Tics that they themselves don’t notice, which they find endearing.
• Makes Just as Much Sense in Context: At the end of Chapter 34, Rentarou strips down to nothing but a loincloth in order to give encouragement to Iku during baseball practice. Everyone else is stunned, and then the next chapter starts with everyone at the game and Rentarou fully dressed, as if the incident had never happened.
• Married in the Future: In Chapter 145, the girls imagine their collective married life with Rentarou.
• Marry Them All: The series' main Taglines always mention it has "zero losing heroines", after all. Rentarou affirms his intention to invoke this trope in Chapter 146.
• Marshmallow Hell:
  • Rentarou suffers this from Yamame in Chapter 67.
  • A shrunken Nano suffers this from Hahari, after the latter falls on her and she gets stuck between Hahari's breasts.
• Mass "Oh, Crap!": At the end of Chapter 145 when Karane reveals that Rentarou proposed to her in the previous chapter.
• Mass Transformation:
  • Chapter 84 consists of a rerun of Chapter 28's Baby Morph Episode courtesy of Kusuri's baby transformation drug. The first time it happened, there were seven girlfriends in the harem, and all the girls except Hakari were transformed. The second time it happened, there were 17 girlfriends in the harem, and all the girls who weren't transformed the first time became babies (11 girls in total.)
    • A third Baby Morph Episode happens in Chapter 167, again with the 10 girls who joined after the previous one being transformed.
  • Chapters 148-149 recycle the "Freaky Friday" Flip plot of Chapter 23, this time with 25 girlfriends rather than 6.
• Masturbation Means Sexual Frustration: Momoha is the first girlfriend to straight up ask Rentarou to have sex with her, and she mentions that while she's currently a virgin, she has plenty of "solo experience". Meanwhile, Hakari is one of the more lustful girls in the harem, but she's also a virgin, though her skill at handling a game controller is attributed to "Mwehehe practice".
• Maybe Magic, Maybe Mundane: It's possible that Rentarou really did speak to Hakari's dead father, or it may have just been a dream. But since this is a manga where gods exist and there is No Fourth Wall, realism is not an issue.
• Meaningful Background Event: In Chapter 79, when Rentarou and Hahari first arrive at the Teddy Baby Museum, the dolls on display have open mouths. After Hahari explains how she would French kiss her dolls as a little girl, the dolls on display have closed mouths. This is a clue to the answer to the final question of the Teddy Baby Quiz.
• Meaningful Name: Takeko Deluxe has a hairstyle resembling a Takenoko, or bamboo shoot.
• Meditating Under a Waterfall: In Chapter 89, both Mei and Iku meditate under a waterfall that's so cold it's only just warm enough to avoid causing hypothermia.
• Medium Awareness: Happens a few times:
  • In the Volume 4 extras, Mei tries to avoid doing anything by leaving the book altogether, and Rentarou tears through the pages to follow her.
  • Rentarou rips the previous pages out when the credits declare Meme is the one person he couldn't save in Chapter 45. He does it again when the narration declares Meme's latest disappearance was the last time anyone saw her in Chapter 122.
  • Chiyo presents Nano with a copy of the manga's Baby Morph Episode to prove to her that heaven exists in Chapter 52.
  • Rentarou disposes of a narration box wondering if Yamame's a Laputian robot in Chapter 64.
  • In Chapter 127, the girls worry about their sizable dialogue preventing them from being able to show off their swimsuits to Rentarou, so Kusuri pulls out her "makes-you-only-use-two-words-max-per-speech-bubble" drug to help out. While it does the job, it turns out for the final group shot that a sufficiently big font size ends up obscuring their swimsuits too.
  • In Chapter 150, Rentarou looks back a page to check if his monologue obscured his ZING!! with Himeka.
  • Uto and Naddy present Himeka with copies of the manga to show her Rentarou is anything but "perfectly ordinary" in Chapter 151.
• "Meet the Celebrity" Contest: Chapter 90 features a raffle to meet the author of Shizuka's favorite book series. Rentarou won two spots by sending "an unhealthy amount" of applications.
• Meet the In-Laws:
  • While Rentarou had met some of his other girlfriends' parents before,^note He met Hakari's mother Hahari when he and the rest of the harem broke into their house to rescue Hakari, while Chiyo's father Hiro is his uncle, and they'd known each other for a long time. Chapter 74 is his first proper meeting, as Kusuri takes him home to meet her parents, who like her usually resemble eight-year-olds due to taking her immortality drug. It goes fairly well, although Kusuri's father isn't too happy that his daughter is dating someone who has fourteen other girlfriends. At the end of the chapter, he meets Kusuri's grandmother Yaku, who also looks eight years old thanks to the immortality drug and turns out to be his sixteenth soulmate.
  • He later meets Yamame's aunt and uncle in Chapter 131 while helping them at their tea shop.
  • In Chapter 134, he goes to Shizuka's house to confront her mother about confiscating her phone. She isn't one of Rentarou's soulmates, so he has to find a different way to resolve the issue.
  • An accidental version shows up in Chapter 144, when Karane thinks her family is out of the house and stops by with Rentarou, only for everyone to show up and stumble upon Rentarou. Karane's tsundere personality isn't just an odd quirk; It Runs in the Family.
• Mega Meal Challenge: Chapter 83 is about a ramen shop owner trying to create one that no one can beat and failing due to Rentarou’s girlfriends possessing quirks enabling them to beat each new iteration, with the last one being one of these.
• Meido: Mei Meido. Patient, diligent, and obedient to a fault. She's later joined by Mai Meido (no relation, not for lack of trying), who's cute, clumsy, hot-tempered, and devoted to Mei.
• Milestone Celebration: The 100th chapter is an In-Universe popularity poll of Rentarou's girlfriends. The first place winner is all 19 girlfriends who were dating Rentarou at the time (the initials on the comments they received making it obvious who maxed out all their tally counts) and Rentarou himself. Other characters' popularity votes were counted at the end of the chapter.
• Mistaken for Related:
  • In Chapter 74, Kusuri's family is attacked by a pharmaceutical spy, who Rentarou initially thinks is another member of the family before Kusuri corrects him.
  • Downplayed in Chapter 85. A passerby sees Rentarou and Chiyo walking home together and thinks the two of them are siblings.
• Modesty Towel: Rentarou wears one when bathing, just in case things get... unwholesome.
• Moe Couplet:
  • The already cute Shizuka looks even cuter next to the beautiful yet stoic Nano, while the normally aloof Nano becomes very caring and doting over Shizuka.
  • Kusuri is usually childish and reckless, but her older self becomes a Cool Big Sis around Chiyo, while the normally uptight Chiyo is more willing to relax and cheer up with older Kusuri.
  • Kusuri invokes this in Chapter 91 by pairing Mimimi with Shizuka so the former's cuteness will become unbeatable. The tall, beautiful Mimimi combined with the small, adorable Shizuka results in a combination that leaves Nano speechless as she stares at them with a dumbfounded look on her face.
• Moment Killer: In Chapter 110, when Mimimi compliments Mai's "beautiful brow" in her own narcissistic fashion, they have what looks for all the world like one of those moments in manga and anime where one romantic lead charms the other... only for Mai to ruin the moment by declaring out of nowhere that only she is worthy of being Mei's sister.
• Mood Whiplash: Slides between being funny, heartwarming, and romantic (and occasionally dramatic) with ease, frequently in the same chapter. Shizuka's introduction in Chapter 3 sets the template, as it goes from a harem romcom Gag Series to a heartfelt story about a lonely, isolated girl finding love and acceptance, before returning to the usual hijinks next chapter.
• More Experienced Chases the Innocent: Played with. No matter how many girlfriends he collects, Rentarou refuses to indulge in any kind of lewd acts at all. But that doesn't stop the more lustful girls (none of whom have actually engaged in intercourse with anyone) from trying to have their way with him and/or convince the other girls to do so.
• Morton's Fork: While waiting in line in Chapter 155, a sudden rainstorm comes down on the queue, forcing the customers to either wander blindly in the rain or stay put and hold up the line, either of which will result in them being forced out of the line.
• Mouth To Mouth Force Feeding:
  • In Chapter 10, Rentarou’s body spasms prevent Kusuri from administering a neutralizer directly, forcing her to resort to Intimate Healing via this method.
  • In Chapter 143, Mei uses this to administer a drink of Pocari Sweat to Mai after she collapses with a fever.
• Moving the Goalposts: The ramen shop owner keeps changing the challenge dish at her restaurant every time one of Rentarou’s girlfriends beats the challenge.
• Multigenerational Household:
  • Kusuri lives with her parents and grandmother.
  • Karane lives with her parents, her brother and sister, her sister's son and daughter, and one set of grandparents.
• Mystical 108: Chapter 108 introduces a girlfriend crippled with kleshas (impurities and desires).
• Naked Freak-Out: In Chapter 11, Hakari has this reaction after her clothes melt off of her body due to the ingestion of a drug made by Kusuri.
• Naked People Are Funny: Whenever a character finds themself naked in the manga, it's usually played for comedy.
• Named by the Dub: A downplayed inversion. Rentarou’s friend in Chapter 1 is referred to as "Anonymous Friend A" in the original Japanese manga, while the official English translation has Rentarou call him "my generic nameless friend".
• Negatives as a Positive:
  • While on a mission to rescue Hakari, Rentarou and the girls are attacked by the dog of a wealthy family. Shizuka is too tiny and weak to escape with the others, but she's so tiny and weak that the dog falls back on instincts to protect weaker creatures over guarding its own territory. Rentarou and the others cheer her on for being so weak.
  • After Eira overcomes her fear to save Chiyo, Uto, and Rin from a bulldozer, they point out that Eira being a scaredy cat leads her to empathize when others are afraid, even driving her to forget her own fear if need be. Uto goes so far as to say cowardice is her strength.
• Nightmare Fetishist:
  • Iku loves scary movies thanks to being Too Kinky to Torture.
  • Rin is a prim and proper Ojou with a secret fetish for blood and violence. Seeing it makes her show her Scary Teeth and giggle like a maniac.
• Ninja Log: Meme can do this, using a stuffed doll instead of a log. It's a reflex whenever she feels embarrassed or nervous, and Rentarou has to break her out of doing it constantly after he confesses to her.
• No Antagonist: The manga's overarching story is about 100 girls falling in love with a boy Blessed with Suck, with the vast majority of troublesome characters either being on an Opposing Sports Team or acting in the interest of their own loved ones. The closest thing the manga has to a Big Bad is the clause that an unloved soulmate is doomed to die.
• No Fourth Wall: For starters, the characters are quite aware that they are in a manga:
  God of Love: (to Rentarou) Stop repeating what I just said! You've been doing that for a while now! YOU'RE JUST WASTING PANELS!!! It's already bad enough that we've got tons of things that need to be drawn for the first chapter!!
• No Loves Intersect: As absurd as the series is at all times, there is a line it has consistently refused to cross: Rentarou simply does not have serious rival male suitors to compete against to win his soulmates over. The very few times a random guy tried to barge between him and the given soulmate she was already completely smitten by Rentarou, and the nuisance was treated like a gag, as everything usually is in the series. The setting itself has virtually no other males outside specific gags and situations, but also it goes to the point none of the girls around Rentarou's age have lingering issues with past or present relationships, not even crushes, of their own; also when it comes to the few older soulmates who clearly had to have prior men in their lives for them to become parents to begin with, they are conveniently widowed women. All of that is obviously done to keep the series light hearted, completely exempt of darker relationship affairs.
• Nominal Importance: Played for Laughs. Rentarou's friend in Chapter 1 is only ever referred to as Anonymous Friend "A". Not only does this establish his insignificance to the overall story, it also sets the tone for the manga as a whole.
• Non-Uniform Uniform: Almost all the girlfriends (the ones who attend school, anyway) wear such distinct and over-the-top variations on the uniform that one would almost assume Ohananomitsu doesn't have a dress code to begin with. Nano's is, presumably, the "standard" high-school uniform, while the same can be assumed of the prim and proper Chiyo's middle school uniform.
• Nosebleed: Rentarou suffers a few when the girls get too sexual for even him to ignore (e.g. Chapter 8, when Hakari and Nano force him to fondle their breasts; it's Played for Drama when it causes him to pass out and nearly drown), but these are mainly done by Hahari, to the point where her maid corps have a blood-transfusion protocol.
• The Nothing After Death: After the ghost of Hakari's father moves on, he winds up in a black void, as seen in his next appearance. He doesn't seem to mind.
• "Not So Different" Remark: Kurumi and Chiyo both tell Mai that they both had difficulty getting acclimated to Rentarou's Family at first for similar reasons to Mai, and Mai realizes that she herself struggled with maid training much the same way the other girls struggled with Mai's lessons.
• Not What It Looks Like: During the slumber party, Hahari takes Rentarou to her bedroom for some "private time", complete with moaning and sighing. The others go to investigate and find Hahari dressing up Rentarou in a schoolgirl outfit, which she finds unbearably cute and he finds embarrassing.
• Now, Buy the Merchandise: Chapter 53 revolves entirely around this; it starts with Karane demanding to know whether Rentaro is getting kickbacks from the manufacturer, and only gets more over-the-top from there.
• No Wrong Answers Except That One: Rentarou tells Mei there are no wrong ideas for a gift for Hahari, whereupon Mei decides to sell her organs. Rentarou responds by calling that a wrong answer.
• The Nudifier: Some of Kusuri's drugs have side effects that, in one way or another, cause the person who takes them to lose their clothes. For instance, the "become even sexier" drug makes whoever drinks it to produce a type of sweat capable of melting clothes, leaving them naked in a matter of seconds as Hakari finds out the hard way.
• "Number of Objects" Title: The number of girlfriends Rentarou will collect. That said, it takes time to get there; the first chapter kicks off with Rentarou, Hakari, and Karane, and by Chapter 169, there are 28 girlfriends.
• Numerical Theme Naming: Parodied. Ahko proposes this as a way to help Suu get to know the rest of Rentarou's girlfriends, with the result being a collection of number puns based on the girls' names or Character Catchphrases.
• Numerological Motif: Quite a few girlfriends are introduced in a way that reflects the number of their debut chapter or their ranking in the harem:
  • Chapter 69 introduces a girlfriend with a Skinship Grope fetish.
  • Chapter 108 introduces a girlfriend crippled with kleishas.
  • Chapter 123 introduces a girlfriend with a Number Obsession. Said chapter was also published in January (the 1st month of the year) 2023.
• Ocular Gushers: The normally uptight Chiyo will cry a river if she loses her glasses.
• Odd Friendship: Being both a Cast Full of Crazy and True Companions, it's not surprising that unusual friendships form amongst the girls. For example:
  • Mei and Iku tend to be paired up despite being very different from one another. The two have a Strange Minds Think Alike moment in Chapter 46's hide-and-seek game when they both come up with the idea to hide in the ceiling; in chapter 89 Iku invites Mei to join her in ascetic training, and one of the sequences in chapter 120 has Mei putting in extra practice to properly paddle Iku's posterior, feeling left out when Rin does it instead, and being happy when Iku and Rin invite her to join in.
  • Naddy and Yaku often demonstrate a Commonality Connection from their similar upbringings and get along well, despite Yaku usually having no clue whatsoever what Naddy is saying at any given moment. In chapter 80, Naddy turns off the faux American during a crisis so Yaku can understand her, only for Yaku to encourage Naddy to be herself even though she's otherwise incomprehensible to the older woman, and in chapter 118 Yaku writes a heartfelt declaration of friendship to a senior teacher giving Naddy a hard time that brings Naddy to tears.
  • Trendy gal Ahko notices Suu's self-loathing as she struggles to integrate herself with Rentarou's family and helps her use her Number Obsession to memorize everyone's names using number puns as mnemonic devices. The chapter ends with the reveal that Ahko is the one girl Suu remembers without needing such a trick. Later, in chapter 128, Suu is uninterested in taking part in Fall Kids until Ahko expresses a desire to see her participate.
  • Perhaps the Ur-Example, though, is Meme and Mimimi - the stars of the manga's very first "hangout" chapter, and still practically joined at the hip in most ensemble scenes. The meek, gentle Shrinking Violet finds the proud, brassy Attention Whore an absolutely fascinating role-model for self-confidence (not to mention a lightning rod to divert unwanted attention), and in turn serves as a model of modest "inner" beauty to her.
• Odd Reaction Out: Some of Rentarou's girlfriends have static facial impressions that barely change even when reacting alongside all the other girls during a heartthrob group reaction:
  • Nano is The Stoic, with her reaction showing as a Luminescent Blush.
  • Momiji has a perpetual pout.
  • Ahko is a Frozen Faced Perpetual Smiler who can only convey her emotions through her eyes.
  • Tama constantly sports a realistic-looking cat mouth, meaning she never shows wild facial expressions like the others.
  • Sometimes there are situations where a different girlfriend has a unique reaction: when the baby girlfriends see Rentarou trying to be a mommy in Chapter 167, most of them are either dumbfounded or silently judging, aside from baby Himeka, who's thrilled.
• Officially Shortened Title: Hyakkano, used for the manga's Twitter, the anime's Twitter, and the anime's website.
• Offscreen Inertia: Iku's utter obsession with Training from Hell is shown to its fullest extent when, after the rest of the group heads home on account of it getting dark, she tells them that she's hanging back and getting a few more practice swings in. They think nothing of it, but when they arrive back at school the next day, they find her still on the baseball field swinging the bat around, and counting in the hundred thousands. She was there all night like it was nothing.
• Off the Rails: The manga is frequently accused of this by the characters themselves whenever something bizarre happens.
• Oh, Crap!:
  • Rentarou invokes this reaction from Mei in Chapter 30. He recounts a humiliating incident as if it happened to him, prompting Mei to laugh, and then reveals that it actually happened to Hahari, causing Mei to open those bright eyes. Subsequent Oh, Crap! moments are the only times Mei’s eyes are open, aside from the occasional Game Face.
  • In Chapter 67, Hakari easily defeats Rentarou in the sumo wrestling match, then gets naked and throws herself on top of him... then realises that the manga would not allow her to beat Rentarou that easily, and that she is the one who has lost.
  • Hahari has the same reaction when she suffocates Rentarou between her breasts, then notices that he isn't moving.
• Once Done, Never Forgotten: While the characters don’t point this out, the writers are a bit too fond of reminding us that Rentarou fell in love with the mother of one of his current girlfriends, (and the grandmother of another) since every time he meets the mother of another girlfriend, for any reason, they explicitly point out that there is no “zing”.
• One Cast Member per Cover:
  • The manga volumes are a partial example. The main cover format has two of the 100 girlfriends on the cover instead of just one (the exception being both of Kusuri's age selves in volume 3), but otherwise they're an example of this; the secondary cover format is a Team Shot of the current girlfriends (or part of a Team Shot). The two girls are always in a similar pose holding each other, and no girl appears on two covers outside the group covers.
  • The Japanese Blu-rays play it straight, with one girlfriend to a cover.
• One Degree of Separation: Several girlfriends have met one another and/or crossed paths long before they fell in love with Rentarou:
  • Nano and Mimimi went to the same junior high a year apart, and have previous history together.
  • Iku and Yamame are in the same class, and Iku's at least familiar with Yamame.
  • After Momiji is introduced, it's revealed that she's not only in Kurumi's class but they sit right next to each other. The two had never interacted before because they both thought the other was weird.
  • When Kishika's introduced, she mentions she's in the same class as Kusuri.
  • The Volume 9 bonus chapter reveals that Momiji met the Hanazonos when she was a toddler. The only reason she has any memory of the day is that she got a ZING!! with Hahari’s bust.
  • Momoha is Yamame's gardening club advisor, and she works for Hahari in the latter's role as school chairwoman.
  • Rin and Uto share a class, although they'd never spoken to each other before.
  • Ahko and Suu share a class, though it can be assumed that the latter's Number Obsession prevented her from talking with the former.
  • Several of the girls were into Himeka and her music before she joined the harem, particularly Meme and Kurumi.
  • Chiyo and Matsuri share a class, and had spoken to each other before Matsuri was introduced to the harem.
• One True Love: Despite the premise of the manga, Hahari deconstructs this by bringing up the corollary that only your one true love will do. She was madly in love with Hakari's father and her decision to have Hakari was so that a piece of him may live on. It was an incredibly dangerous decision that she openly admits was reckless and left her a single mother. Furthermore, she goes into detail about how losing him caused a void in her life that not even her daughter's love could fill. It was only when she fell in love with Rentarou, which proved that she could love again and disproved the notion that only that one specific person will do, that the void was filled. Also, being Hahari's soul mate wasn't enough to overcome the cruel reality that he had a terminal illness. Being someone's ideal match doesn't mean you're immortal or will even get to enjoy your time together.
• Only Six Faces: Becomes more obvious the more characters there are, and makes it difficult to tell them apart at times.
• O.O.C. Is Serious Business:
  • When Rapko mocks Shizuka in order to throw her off her game, Shizuka is so upset that she actually uses her own voice when apologizing.
  • If Mei's eyes are open while she's smiling, you know you're in for a bad time.
  • The first sign that something is wrong with Karane after losing her tsundere-ness is when she brushes off Kusuri being knocked into her instead of getting angry over it.
  • In Chapter 54, Shizuka is so fixated on kissing that she can't focus on the book she's trying to read.
• Opening Narration: A few chapters start out with one:
  • Chapter 18 describing Hahari meeting a soulmate for the first time in years.
  • Chapter 28 has Hakari describing how much her mother has changed since joining the harem.
• Opposing Sports Team:
  • The Gorira Alliance, a group of many enormous women and one extremely feminine man, who appear in competitions against Rentarou and the girls. Hakari and Karane are surprised to see them the second time, not having expected they would ever show up again.
  • Jurassic High School is this for the baseball team, consisting of nine girls that all resemble and are named after dinosaurs. Their captain, Rapuko, likes picking on people's insecurities in order to get an advantage.
• Our Centaurs Are Different: According to the Volume 12 extras, this would’ve been the result of Kusuri’s “makes-you-faster” drug.
• Outhumbling Each Other: When pondering how to help Shizuka integrate into the group, Rentaro has an internal monologue about how it's easier to open up to someone who has seen your inner, most emotional self. This is presented as two salarymen having a knock down, drag out brawl and becoming friends after seeing the other as a Worthy Opponent. The event that preceded the fight was the two of them each attempting to hand their business cards to one another at a lower height than the other and escalating from there.
• Out of Focus:
  • Unfortunately, the huge cast means that not everyone can be developed all the time. Most of the girls get almost all their development during their debut arc, and thereafter are just there to deliver a few gags. However, there are attempts to avert this every so often.
  • On the flipside, there are several chapters where Rentarou is sidelined or absent and the focus is on the girls.
• Overly Long Gag: Each round of the sumo tournament at the end of Volume 8 (chapters 67 and 68) ends with Rentarou and his opponent "lovily-dovily praising each other on a fight well fought".
• Overly Long Name:
  • As is eventually revealed through the name of Iku's baseball team, the school that the cast attends is "Ohananomitsu University Associate Senior High School". Chiyo's introduction reveals that there's also a junior high of identical naming.
  • One of the ramen challenges in Chapter 83 is titled the "Jugemu Jugemu Gonzalezurikire Kaijohnnysuigyou-no Suigyoumatsu Unraimatsu Fully-Made-Two Kuunerutokoro-ni Nomutororo Yaburakouji-no Bra-Burglar Paipopaipo Paipo-no Schwarzenegger Shuuringan-no Guten Morgan Guurindai-no Ponpokopii-no Pen Island-no Choukyuumei-no Josuke's Just Great-as-Hell Challenge Ramen". This doubles as a Shout-Out to the famous rakugo story Jugemu.

P-R

• Page Three Stunna: Chapter 27 opens with a color picture of Hakari in a swimsuit for absolutely no reason.
• Painting the Medium:
  • Once when Rentarou is asked what he likes about each of his girlfriends, he makes a speech so long that it requires a double-page spread and tiny font to fit it all.
  • For the fake drinking party, Rentarou makes a plexiglass sign with text declaring that no actual beer of any kind has been drunk. It appears in every single panel during the party.
  • In Episode 1, a scene with the God of Love gets skipped over by clicking on a skip button. He's not happy to realize this.
• Pair the Spares: Temporary version. Rentarou gets away from zombified Hakari and Karane by making them kiss each other.
• Paper Tiger: Hahari is uncompromising in protecting her daughter from what she thinks are villainous men. However the very instant she feels a twinge of love she becomes a squeeing mess.
• Parental Marriage Veto: Hakari's mother refuses to let her see Rentarou again because she believes Hakari will inevitably suffer a broken heart dating someone who is dating four other girls at the same time. This gets more complicated when Rentarou makes eye contact with her and they feel the shock running through their bodies indicating that she is also one of his soulmates.
  • Inverted with Mei. Hahari simply orders her to be Rentarou's girlfriend after the two fall in love.
  • Also inverted with Chiyo, as her father Hiro is doing everything in his power to ensure she marries Rentarou.
• Parlor Games: One of the extras for Volume 6 depicts Kusuri and Mimimi playing Shiritori before falling asleep. Since the last words they say are their respective Verbal Tics, the only answers they can come up with all start with either 'P' or 'Y'.
• People Jars: Kusuri uses this as an example of her "freedom outfit".
• Pervert Alliance:
  • Rentarou's harem is known for its friendship and mutual assistance - but it also means they do perverted things together. For example, in Chapter 21, everyone except Shizuka is trying to spy on Rentarou taking a bath. Rentarou turns out to be ready for this, and the plan fails - ironically, only Shizuka sees Rentarou naked.
  • Hakari is especially prone to making these. She sometimes conspires with her mother on plans to get intimate with Rentarou, and she bonds with Momoha over their shared "solo experiences," to the point where they share diaries of their Erotic Dreams with each other.
• Phenotype Stereotype: Played with in various ways (being a World of Technicolor Hair helps):
  • Kusuri and Yaku subvert the stereotypical Celtic look, both being Japanese redheads with blue-green eyes (in the manga they're more green, in the anime they're more blue).
  • Mimimi and Ahko subvert the stereotypical American look, both being blonde, blue-eyed, and Japanese.
  • Naddy invokes this; she already had blue eyes, and dyed her hair blonde to look American.
  • Eira has brown skin, green eyes, and light grey hair. Her Brazilian father has the usual Latin American look.
  • Matsuri is the first girlfriend to play it straight, being half-English with blue eyes and blonde hair... but with Mimimi, Naddy, and Ahko around, it's not an immediate signifier to the audience. Also, while she thinks she's dressing in British festival wear, most people would associate it with Japanese fashion.
  • Eira initially thinks Naddy and Ahko are half-American, relying on this trope, only to be corrected by Nano. Naddy's pleased someone thought she was half-American.
• Phrase Catcher: Hahari and "The <blank> of a wealthy family!" The chapter in which she takes in Tama to let her be a cat at her mansion is titled "The Tama of a Wealthy Family".
• Pinky Swear:
  • Rentarou uses this to secure his promise not to cheat during the kissing game in Chapter 2.
  • Naddy uses this in Chapter 71 to promise Chiyo not to tell the rest of the family what she told her at McDonald's.
• Playboy Bunny:
  • Meme dresses as one in Chapter 55.
  • Hakari, Karane and Iku dress as Playboy Bunnies in one of the extras in Volume 7.
  • Mai signs up to train as one by mistake in Chapter 170, and Momoha joins in training alongside her.
• Playing Drunk: Rentarou and the girls do this in Chapter 109 after Momoha joins the family. The original plan was to serve Serious Kids Beer at a sleepover, but the Big Cheese of the Publishing Biz refused to allow it, and so Rentarou set up atmospheric conditions to simulate drunkenness instead.
• Please, Don't Leave Me:
  • Hahari tearfully begs Rentarou not to leave them in Chapter 67 when it looks like he Died Standing Up.
  • In Chapter 111, Ahko begs Uto not to leave when it sounds like the latter will be gone for a long time, although it turns out Uto was just going to the bathroom.
• Plot Tailored to the Party:
  • In the Eating Contest, while the girls were able to choose who participated in each round after seeing what the dishes were, it seems a little too convenient that all of the dishes align with their skills.
  • It's really convenient that the girls showed up at the ramen shop in just the right order to overcome the owner Moving the Goalposts on beating the challenge dish.
  • The girls participate in the rounds of the sports festival that can be beaten using their unique quirks, and there are a number of unexpected elements that the girls manage to overcome using their unique quirks anyway.
  • Chapter 128 features Shizuka, Kusuri, Chiyo, Momiji, Yaku, and Suu participating in a Fall Guys-based game. Each girl is able to navigate the obstacles to ensure success using their various special traits. This prompts Character Development for Suu as, after some initial confusion about why they're helping each other when it isn't a team game, she utilizes her Number Obsession to guide everyone through a round they would have otherwise lost.
• Plug 'n' Play Friends: All the girls become True Companions with the rest of the group within a chapter of joining the harem, even Hakari’s mom and Kusuri's grandmother!
  • A chapter is spent when Yaku joins as she tries to memorize everyone's names and histories, with humorous results when she makes mistakes.
• Pocket Protector: Rentarou fantasizes about this, using the wooden charms with his girlfriends' faces on them. Subverted in that he moved them out of the way because he doesn't want to put his girlfriends in danger and dies anyway.
• Poison and Cure Gambit: A pharmaceutical spy poisons Kusuri's parents to coerce their daughter into working for him, clearly planning on using her drugs for unsavory purposes. Rentarou figures the poison was a drug, and he tricks the spy into shooting a vat of the neutralization drug to restore the parents.
• Polyamory:
  • The entire story revolves entirely around the protagonist gaining 100 soulmates, all of whom love him and are perfectly willing to share him. Rather than just a standard harem however, relationships begin to blossom between the girls too, the Homoerotic Subtext played up for all it's worth. Hahari and Ahko in particular are shown to have intimate relationships with the other girlfriends - Mei, Kishika, and Tama for the former, and Karane, Uto, and Suu for the latter. Then of course there's Hakari and Karane which is flat out text.
  • Meme suffers from bisexual panic, particularly around Mimimi. Mimimi in turn loses her cool around Nano, and Nano absolutely adores Shizuka's cuteness. Iku, Rin, and Mei are in a happy S&M relationship (Iku getting paddled by the other two). Momiji loves groping women in general, but particularly loves groping the harem's bustier members. Mai longs for Mei and quickly forms a rapport with Kurumi and Chiyo. And that's just the blatant stuff.
• Pom-Pom Girl: In Chapter 70, Shizuka, Nano and Nadeshiko dress as cheerleaders during Momiji's massage of Mimimi. Shizuka and Nano dress as Japanese cheerleaders (in tracksuits, gloves and whistles), while "Naddy" dresses as an American cheerleader.
• Posthumous Character: Yaku's husband, who we learn about through her. Hahari's first love averts this, popping up as a present-day spirit.
• The Power of Love: Parodied in Chapter 26. Kurumi is skeptical that the other girls are able to eat so much just by invoking this trope, and it turns out that Rentarou has to pet them till their stomachs calm down, lest they puke.
• Pragmatic Adaptation: Rentarou's Imagine Spot of Nano mimicking Kusuri's Verbal Tic is Adapted Out in Episode 7 due to time constraints. The associated pun would inevitably have been Lost in Translation as well.
• The Pratfall:
  • Mimimi's skin is so smooth that she slips and falls if she's not wearing shoes on a smooth surface.
  • Yamame tends to fall over when something spooks her, accompanied by a "Thwoom" sound effect due to her large size.
  • Mai is prone to this as part of being a Cute Clumsy Girl.
  • Similarly to Yamame, Eira tends to fall over when she's spooked, and there are a lot of things that spook her.
• Pre-Ending Credits: In Episode 8, Nano catches Rentarou in a broom closet, where she proceeds to kiss Rentarou continuously as credits start rolling. The scene is interrupted by Kusuri showing up with the antidote to the kissing zombie drug in Nano's system.
• Predatory Big Pharma: In Chapter 74, a spy working for an overseas pharmaceutical company tries to coerce Kusuri into working for him by poisoning her parents and offering the antidote in exchange for her services. He threatens to shoot Rentarou when he attempts to stop him, leading Kusuri to act as a Human Shield.
• Prefers the True Form: After the girls recover from a "Freaky Friday" Flip induced by Kusuri's drugs, Rentarou explains that while seeing the girls' personalities switched around made his heart go crazy, he still prefers the girls as their usual selves.
• Prehensile Hair: Nano gets this briefly from drinking one of Kusuri's drugs. Hahari drinks the same drug in Chapter 42, but it reacts badly with the hair-growth drug she had previously consumed, and causes her hair to become large enough to consume the entire world.
• Primal Fear:
  • One of the few things that can break Nano's cool demeanor is her fear of heights.
  • Yamame has a fear of fire. Just smelling smoke is enough to make her play dead.
• Product Placement:
  • Apple and McDonald's have been mentioned in the story, with the latter making an appearance for Naddy to talk to Chiyo.
  • During a play session in Chapter 29, Kusuri feeds Kurumi a HiChew to get her to play.
  • Kurumi mentions Toppo, a reverse Pocky made by Lotte, in Chapter 82.
  • Tiffany's jewellery store appears in Chapter 83.
  • Chapter 86 features Pocky sticks, in contrast to them being called Bocky sticks in Chapter 2. Apparently, the bland name was intended as a problematic Double Entendre.
  • Mei gives Mai a bottle of Pocari Sweat in Chapter 143.
• Psychological Projection: When Rentarou calls Shizuka’s mother out on her abusive behavior, she defends herself by insisting that she is doing what is best for her daughter and that Rentarou is exploiting her for his own selfish reasons, ignoring that she is the one demeaning Shizuka and forcing her to change everything about herself and never once showing her any affection, solely as a result of her pride not allowing her to admit that Shizuka has special needs that need to be accommodated.
• Public Bathhouse Scene: Chapter 77 has the family visit a mixed bathhouse before it's open to the public. Unfortunately, the place was built by the Serious Group, so all the features make it quite dangerous.
• Pun: In Chapter 72, Nano becomes very tiny - in other words, a nano Nano.
• Punny Name:
  • Aijou Rentarou (to use the original Japanese order)^explanation愛人 means "lover"
  • Shizuka means “silence”.
  • Eiai Nano is likened to an Artificial Intelligence.
  • Kusuri's name is a homophone for "medicine", and the "yaku" part of her surname is another word for the same.
  • Hahari: "Haha" means mother in Japanese.
  • Meido, of course.
  • Iku's name, in the original order, is Sutou Iku... that is, "stoic". While this may seem like an Ironic Name given her fairly open personality, it likely stems from the Japanese-loanword stoic having different connotations from the (modern) English one: while the latter points more to a specific demeanor, the former is more about just how much pain one can take (or, in Iku's case, enjoys).
  • Iin Chiyo is a pun for "Class President".
  • Baio Rin puns on "violin", Rin's signature instrument, and "violence", her signature fetish.
  • Kaho Eira is a pun on "capoeira", Eira's signature martial art.
  • It turns out it goes further than most English-speaking fans realize - all the girls' names have Japanese puns layered into them in kanji, reflecting their character traits and design.
• Puzzle Box: In chapter 103, Lovable Sex Maniac Hakari is feeling extra frisky towards Chaste Hero Rentarou. One of her attempts to get at him includes tripping in such a way her hands grab his belt buckle, which she discovers Rentarou has replaced with a wire puzzle she can't solve before Rentarou gives her a kiss to help temporarily calm her.
• Questionable Consent: Defied. Rentarou refuses to accept a confession if he is under the influence of a drug or he thinks a girl isn't being honest about their feelings. Chapter 85 emphasizes that last point when he admits to the God of Love that he refuses to bring up the soulmate death clause with his girlfriends.
• Ragtag Bunch of Misfits: Being a Cast Full of Crazy, when the harem forms a team they become this, but since they're also True Companions, they don't have much trouble working together. As an example, the team they form to rescue Hakari in Volume 3 features a Love Freak who'd do anything for his girlfriends, a Tsundere Only Sane Woman, a Cute Mute bookworm who commmunicates using her phone's text-to-speech app to quote her personal library, an Emotionless Girl who's efficient at everything she turns her hand to, and a Mad Scientist with Dual Age Modes who can make drugs that do anything setting out to rescue their missing member, a Lovable Sex Maniac with a devious streak, from her Knight Templar Parent mother, and the teams only get weirder as more girlfriends turn up.
• Rapid-Fire Comedy: While this has been part of the series's comedy from the get-go, from about the time Chiyo joined, it's become the go-to for pretty much any story that tries to include all the girlfriends at once. Usually there's just about enough room to do a gag with each one.
• Readings Are Off the Scale:
  • Iku maxes out the smack counter during the meditation training in Chapter 89.
  • The vote tallies in Chapter 100 max out at 99,999,999 votes.
• Rebuilt Pedestal: In Chapter 90, Rentarou and Shizuka meet the author of Circlet Love Story, who turns out to be an alcoholic gambling addict. Except, not really; he's actually a rival author who is impersonating the author of Circlet Love Story as revenge for the work outselling his own. The real author is much more friendly, and she even regains her motivation to continue the series when she meets Shizuka.
• Recursive Canon: The manga and its creators exist independently of the characters in-universe, and the manga's available in bookshops.
• Red Herring: Toruru Kijineta is given a full name and position in the school. The fact that her blackmail photos that include Rentarou don't have him looking at the camera, as well as Rentarou not knowing of said photos when they are first presented, suggests that Toruru would eventually become one of the girlfriends. But so far, nothing has come out of that.
• Red String of Fate: Two people who are destined to be soulmates will feel a sudden ZING!! when they meet each other's eyes.
• Reference Overdosed: There are many, many Shout Outs, as listed here.
• Reincarnation Romance: It is implied that Rentarou is a reincarnation of Yaku's original husband, since he sometimes sees her as she was when she was married.
• Reveling in the New Form: In chapter 23, the girls switch bodies with one another following a drug accident. All the girls embrace their predicament, with the only exception being Nano.
• Revenge Porn Blackmail: In Chapter 55, Hahari threatens to disband the newspaper club if Toruru keeps harassing Meme for a photo. Toruru responds to this by blackmailing Hahari with photos of her amorous interactions with the students at the school.
• Right Out of My Clothes: In Chapter 67, it took less than one panel for Hakari to remove all the clothes she was wearing, even though it all turned out to be just part of a dream of hers.
• Romantic Spoonfeeding: In Chapter 139, Kusuri and Momiji invoke this trope by baking four dozen loaves of bread made with a drug that simulates the taste of whoever holds it in their hand for an extended time.
• A Rotten Time to Revert: Inverted in Chapter 59. Rentarou and the girls get stuck in a photo booth due to Kusuri aging herself up by taking the neutralizer. Normally, there would be time to wait for the neutralizer to wear off, but the girls are suffering a Potty Emergency in this case, and they don't have time to wait for Kusuri to regress back to her child form.
• Rousseau Was Right: Though there are a few exceptions, for the most part the manga depicts even the most throwaway of jerks and bullies as well-meaning people deep down; in particular, any young males who antagonize Rentarou are usually explained as trying to please their own girlfriends.
• Rule of Three:
  • In Chapter 34, Kusuri tries to play catch with two catching gloves, and later tries to use three bats at once. In the bonus page, she tries to clean the field with two rakes. All three times when she's called out on it, she responds with "But it's so cool..."
  • In Chapter 56, Rentarou throws himself awake from three dreams where he gets intimate with one of his girlfriends.
  • In Chapter 84, the phrase "this lifeform would perish" appears three times; twice thought by Nano if nobody protected it, and then the ending tag if nobody comforted it.
• Rummage Fail: In Chapter 48, Kusuri accidentally grabs a "tsundere unmaker" drug while looking for a neutralization drug.
• Running Gag: A whole lot in fact.

S

• Salt Solution: In Chapter 85, Rentarou attempts to drive the God of Love away with salt.
• Sanity Ball: While Karane, Kurumi, and Chiyo are the most consistent straight men of the cast, nearly all the girls have a moment where they get to be the Straight Man, to the point where it would be easier to list the girls who are never the Straight Man: Mei, Iku, Yamame, and Yaku.
• Satellite Family Member: Rentarou's and many of the girlfriends' relatives have made brief appearances or were mentioned in passing. Ones with particular effects on the story include:
  • Rentarou mentions that his parents are schoolteachers and have modest incomes, establishing that he actually works for the affections of his girlfriends.
  • Shizuka's mother played a major role in her daughter being a Cute Mute through her abusive attempts at getting her to talk like a normal person. She's initially seen in a brief flashback in Chapter 3, then takes the spotlight in Chapters 134 and 135 when Rentarou confronts her about confiscating Shizuka's phone for using a text-to-speech app to talk.
  • Hakari's father was a terminally ill middle school student with whom Hahari had herself artificially inseminated. His subsequent passing was the main factor in Hahari vying for younger days, and by extension becoming highly protective of her daughter, whom she believed would make the same reckless choices as she did without her guidance.
  • Mei's Abusive Parents disowned her after being crippled by Loan Shark debts, leaving her to wander through the snow until she was rescued by Hahari, who went on to hire her as a maid.
  • Iku's older brother Ikuya was inadvertently responsible for Iku discovering masochism.
  • Chiyo's father Hiro did everything in his power to pair up Rentarou and his daughter after Rentarou saved him from a truck as a young boy. Once they get together, he pops up to cheer on whatever Chiyo's doing, push her to be the main girlfriend (much to her irritation), or showcase her role as the responsible child to his immature parent. Her mother disappeared from her life before she met Rentarou, and Chiyo wears her glasses as a Tragic Keepsake.
  • Naddy's parents disowned her after she abandoned her Yamato Nadeshiko lifestyle in favor of that of a reverse Occidental Otaku. They had forced her to behave like a traditional Japanese lady through abusive tactics, which led to her rebelling against them and embracing American culture.
  • Yamame's father looks after his daughter quite well. Her refusal to leave the house after accidentally stepping on a bug led him to hypnotize her to alleviate her feelings of guilt and then teach her to walk on stilts so she could feel more comfortable about working in the garden.
  • Yaku and her deceased husband loved each other very much, and Rentarou finds himself navigating the legacy of that relationship - trying to live up to his example, discovering the secrets he hid, etc.
  • Kishika's parents had busy lifestyles that led to her raising her siblings all on her own. Her childhood responsibilities deprived her of the chance to enjoy being a little girl to the point where she secretly wishes to be pampered by someone else despite publicly presenting herself as a mature and knightly kendo club captain.
  • Mai always wanted to be a maid like her grandmother, the previous head maid at the Hanazono estate, and repeatedly asked her to take her to work. When her grandmother finally let her tag along, seeing Mei at work left a big impression on the young Mai, and she decided to try and be just like her. She holds her grandmother in high regard, and wants to show her that she's improved.
  • Rin's parents are strict Moral Guardians who did their best to have her avoid encountering any violence from infancy onwards, fearing her love for it would hinder her upbringing (coupled with her father's fear she'd get her heart broken over being an open Nightmare Fetishist). She caught a brief glimpse of a Resident Evil film as a young girl which, true to the trope of Strict Parents Make Sneaky Kids, had her falling back in love with violence on the quiet.
  • Eira's father is a capoeira instructor who trained his daughter extensively in the art, and as a result she became convinced she could take down anything with a kick, including colds and rivers. When he realized this, he tried to use a Bedsheet Ghost to teach her that there were some things a kick couldn't handle, but instead she developed a phobia of anything that couldn't be kicked. She also has anxieties over her role as Heir to the Dojo.
  • Matsuri met Rentarou while working at her grandparents' yakisoba stand.
• Scary Fiction Is Fun: Iku and Rin both enjoy horror movies, with the former being Too Kinky to Torture and the latter being a Nightmare Fetishist.
• Scenery Censor:
  • In Chapter 67, after Hakari gets naked, the only thing covering her body is the Written Sound Effects of the manga, which act as a sort of Censor Suds.
  • In Chapter 80, when Meme's bangs are blown away by strong wind, Nano offers to use her own billowing hair as a cover.
• School Festival: One occurs in Chapter 63.
• Screw This, I'm Outta Here: In chapter 165, Meme is happy to indulge Kishika by singing her the "Pain, Pain, Go Away" song. The moment baby mode Kishika wants to suckle, however, Meme Ninja Logs the hell away.
• Screw Yourself:
  • The cover of Volume 3 has both of Kusuri's forms getting touchy-feely.
  • In Chapter 122, Meme dreams about one Rentarou coming on to another yaoi-style.
• Second Place Is for Losers: At least for the Rentarou family, taking second is pretty much just "first loser", especially for a series whose tagline is "the romcom with zero losing heroines". Best exemplified in the 100th chapter, where everyone was nervously looking over the results of an in-universe popularity poll and anyone who hadn't been called yet agonized over the possibility of not being #1. They all won, including Rentarou, so that was a moot point.
• Seen It All: By the time Kishika shows up to be girlfriend number 17, everyone else is so used to one another's oddities that they take Kishika's slips into infancy in stride. As the narration notes while everyone is watching Hahari nurse Kishika:
  While they were a bit disappointed [Kishika] wasn't really quite as cool as they first thought, that "same ol' same ol'" feeling really did make them feel right at home.
• Self-Deprecation:
  • Karane doesn't think much of the conception of the manga's setting in Chapter 29, pointing out things like Kusuri's drugs, Kurumi's fourth-dimensional stomach, and Hahari's Mount Everest-sized boobs.
  • In Chapter 37, Rentarou says the author's "messed up in the head".
  • Two guys in Chapter 61 at a bookstore display with copies of the manga itself call the title “cringy as hell” and mention the creator wanting to crawl in a hole and die due to being “too ahead of the curve”. Later, one of Chiyo’s classmates in Chapter 71 says that 100GF is more expensive and worse for the brain than cigarettes.
  • In Chapter 84, the girlfriends wonder why they're doing a Baby Morph Episode again, with Nano suggesting the manuscript was late and Hakari commenting that a weekly series with 18 main characters was always going to be too much for the author.
  • In Chapter 125, Kusuri complains that the "stupid idiot moron author" made the manga so dumb she can't have a dramatic run in peace.
  • In Chapter 127, Hakari, Mimimi, and Karane are concerned that the sheer amount of dialogue in the manga will prevent them from showing off their swimsuits for Rentarou, with Karane saying it's because "that moron author can't stop writing so much moronic dialogue".
  • In Chapter 172, Ahko says she doesn't really get difficult manga, and likes 100GF because it's super easy. Kurumi comments you have to be smart to write difficult manga.
• Sequel Episode: As the cast's size has increased, early chapters that featured particular gimmicks are revisited and reused with the girls that have joined Rentarou's family since the last time.
  • The "Freaky Friday" Flip chapter, "His Name", occurred very early, when there were only six girlfriends. It was revisited after the number of girlfriends had grown from six to twenty-five. With more than quadruple the potential for chaos, "His Name Returns" was a two-parter from chapters 148 and 149.
  • The Baby Morph Episode, "Everyone Was a Baby at Some Point", originally featured the first seven girlfriends, minus Hakari, being turned into infants. The plot was revisited shortly after Kishika's entry into the family and every girlfriend after Kurumi, this time plus Hakari, was babified. A second sequel followed after Matsuri joined the family, with every girlfriend after Kishika getting babified.
  • Chapter 62, "The Rentarou Family's Idolmaking Project", begins an arc that sees the then-thirteen girlfriends recruited into training as an idol team for a show to be held at school. The first arc after songstress Himeka Saiki joins the family is a repeat, in which the thirteen girls that have joined are the ones training to be idols. Some pages are panel-for-panel repeats of the original, and the sequel also shows off the Character Development their trainer, Tina Quali, received the first time around.
  • Chapters 120, 130, 157, and 165 are titled "Rentarou's Family's Daily Life" parts 1, 2, 3, and 4 respectively. They consist of various 2 to 3 page skits showing the characters in one-off Friendship Moments between the cast and often mix up the pairings of the girls seen normally in the series. For example, Mai taking care of Momoha after she'd been drinking, Kusuri and Momiji becoming a pair of tiny traveling nurses, or Nano mesmerizing Suu with her ability to recite Pi by memory.
• Serious Business: The aptly named Serious Group, who go well above and beyond with all of the products they sell, often causing problems for people unaware of their practices.
• Sexy Soaked Shirt:
  • In Chapter 25, the announcer is drawn in wet clothes while explaining the rules of the Eating Contest.
  • In Chapter 126, an adult theme park includes a roller coaster with a splashdown element intended to invoke this trope.
• Sexy Sweater Girl: The theme of Chapter 171; after Rentarou accidentally drinks the Kills you if you aren't thinking that the "stacked woman-ponytail-knit sweater" combo is the best! drug, he's tended to by the E-cup+ girls while they're wearing sweaters.
• The Shameless: Momoha is the closest to a straight example of this so far. She spends most of her money on alcohol and gambling, drinks while on duty despite being an ethics teacher, and while she isn't the first teacher to join Rentarou's harem, she is the first girl to ask him to have sex with her right after she confesses to him. That being the case, she uses the money she doesn't spend on her vices to provide support for the school's gardening club and her parents, weeds the school grounds every day of her own accord, and if she can't indulge in her desires at the moment, she has no problem waiting until she can. Rentarou doesn't hesitate to call her out on her unethical behavior, nor does she hesitate to call him out for dating 20 girls alongside her, one of whom is 89 years old.
• Shapeshifting Excludes Clothing: Kusuri's drugs that de-age or shrink people play this straight in both directions.
• Shapes of Disappearance:
  • During Meme's introduction to the harem in Chapter 46, she hides behind Rentarou, meaning that she isn't standing where the new girl usually is when Rentarou says his Mad Libs Catchphrase, instead showing a blink effect in Rentarou's hand.
  • In the Season 1 opening sequence, the outline of Rentarou’s backpack flashes on his desk when he realizes he forgot it at his house.
• Shared Dream:
  • In Chapter 109, the Big Cheese of the Publishing Biz confronts the harem in their dreams to overrule their plan to serve Serious Kids Beer at a sleepover.
  • In the Volume 11 extras, Meme and Karane both dream about switching bust sizes.
• Shout-Out: A plethora of them, being a Gag Series and all.
• Show Within a Show:
  • Kusuri's favorite, Pepepe no Pentarou. The little guy's merch pops up all over the series.
  • In Chapter 60, Iku mentions that she is going to see Pa-On: The Bludge.
  • Episode 1 changes the Castle in the Sky reference to Fortress in the Sky, with "Balse" getting changed to "Balus".
• Shrinking Violet: Meme hates being noticed, so she grew out her bangs to cover her face and acquired a reflexive Ninja Log technique to quickly hide when she feels nervous. She has an admiration for Mimimi who loves being the center of attention.
• "Shut Up" Kiss: In Chapter 132, Eira talks continuously out of fear that Rentarou will reject her, but the boy promptly kisses her to assure her that he does accept her confession.
• Sick Episode:
  • Chapter 143 sees Mai falling ill with "little sister anxiety", induced by feeling her (imagined) position as Mei's little sister is under threat.
  • Chapters 171-173 form a trilogy of these, as Rentarou repeatedly downs Kusuri's lethal drugs and different groups of girlfriends have to look after him in order to cure him.
• Silly Brain Diagram: In Chapter 31, a map of Rentarou's brain shows that he (quite literally) has "love" written all over it, with only a tiny spark of "desire" in the center.
• Simple Solution Won't Work:
  • In chapter 34, Karane suggests that Hahari could use her authority as the school chairwoman to prevent the baseball club from being disbanded. Hahari refuses to give the club any special treatment, since she would have to do the same for all the other school's clubs in order to avoid playing favorites.
  • After Rentarou secured 18 girlfriends, he goes to the shrine of the Love god that "granted" him the 100 soulmates boon. While the god is remorseful, he asks why Rentarou simply doesn't tell his soulmates that they need to be coupled with him for the sake of their life (as if they make eye contact but the girl truly rejects Rentarou for any reason, the bad karma from doing so will kill her). Rentarou responds that if he did, he's basically be coercing all of his girlfriends into a relationship regardless of their wishes, and he'd rather be in a relationship where they want to stay with him naturally.
  • Since Tama wants to laze around without being a burden while Hahari is an extremely rich woman who adores cute things, one might think the easiest solution is for Hahari to adopt Tama, which Hahari herself points out. Unfortunately, being adopted by Hahari doesn't make Tama happy, because lazing around doing nothing all day makes Tama feel worthless compared to everyone else.
• Sitcom Archnemesis: Uncle Hiro and Papa Yakuzen's Ship-to-Ship Combat over their daughters eventually develops into this, much to said daughters' embarrassment.
• Sleep Cute: Somehow managed with 14 girlfriends at the end of Volume 8.
• Sliding Scale of Plot Versus Characters: The overarching plot revolves around Rentarou being destined to have 100 soulmates and his efforts to ensure that all of them are happy with him, and the manga puts considerable effort into fleshing out the soulmates in question.
• Sliding Scale of Silliness vs. Seriousness: Can best be described as a Gag Series with sincere heart. On the one hand, the creators' response to the absurdity of the concept is to lean into it by piling the absurdity on. On the other hand, Rentarou's romances need to be sincere and heartfelt to make the concept work. Which means the series needs to be able to switch between modes when needed.
• Soft Water:
  • Rentarou saves Hakari's life by redirecting their fall towards a swimming pool instead of the hard ground.
  • Averted when Kusuri almost falls off the roof by accident. They are all terrified for her safety, despite the pool being directly below. Fortunately, Rentarou pulls her up, and all the other girls have his back.
• Solo Mission Becomes Group Mission: When Rentarou makes his plan of rescuing Hakari from her mother known to the other girls, they all decide to join him in his mission.
• Someone to Remember Him By: Hahari got impregnated at age 13 because her lover had a terminal disease. Deconstructed, as by necessity for this trope, Hahari was left a single, grieving mother once Hakari's father actually passed on, and while she loves Hakari deeply, it was a task that took her complete devotion.
• Soul-Crushing Desk Job: Tama's job as an office lady eventually wore her down so hard that the only reason she didn't commit suicide was the thought that she might just reincarnate as a human instead of a cat like she wanted and experience that hell all over again. Before meeting Rentarou she was perfectly prepared to starve to death as a stray cat rather than rejoin the work force as a human.
  Tama: Tama's already embraced the feline condition, meow... give me felinity, or give me death...
• Soulmate AU Fic: A relative of this, being an original and officially published soulmate setting; here, while people can have soulmates, it's not a guaranteed thing, and those who do are fortunate. Meeting a soulmate requires eye contact, it feels like a shock just ran through your body (a ZING!!), and it happens at a destined time. People can have any number of soulmates (usually one), or none at all, and how many they'll have is normally divinely decided at birth. However, there doesn't seem to be a way to know the identity of your soulmate(s) ahead of time, there's no guarantee the relationship will work out, if it doesn't work out they'll die of bad luck shortly afterwards, and nothing about the whole situation is commonly known; Rentarou only knows about any of this thanks to the God of Love telling him.
• Spaghetti Kiss: Invoked in Chapter 86 when the whole family plays the Pocky Game. Karane and Hakari wind up having their candies connect end to end and both think they're kissing Rentarou.
• Speaking Up for Another: In Chapter 135, Rentarou confronts Shizuka's mother after she confiscated her daughter's phone. She believed that Rentarou was enabling her daughter by transcribing her books into a text to speech app, with Rentarou rebutting that forcefully trying to get Shizuka to talk like a normal person wouldn't get the desired results.
• Special Edition Title: Episode 11 has Hahari buy the episode's end credits for a deranged fairytale fantasy sequence with her singing an original ED, dragging the others along for the ride.
• Spiritual Antithesis: To a manga that started getting serialized right alongside it, Girlfriend, Girlfriend. Both are wacky gag-based harem romantic comedy manga, both have devoted and straightforward male leads, both have everyone admit that what they're doing would be considered cheating in any other relationship, and both have the girls try to make the relationship work as the harem grows. However, there are key differences; while the attraction is supernatural in 100 Kanojo, everyone is genuinely in love and they are willing to make friends with the rest of the harem, eventually piling up into a family dynamic. Rentarou also has energy to spare so his girlfriends never have to feel like they're left out of the loop. In contrast, Girlfriend, Girlfriend has the love happen naturally, but it focuses on the problems with a harem; that the girlfriends he has do in fact want to monopolize their man's attention even if they like the other girls, and explores what happens if a haremette wants him all to herself or when he can't keep up with their needs and his own selfishness. The harem is also much smaller and he only intends on dating two of them.
• Spit Take:
  • Karane in Chapter 9 when Rentarou mentions her staring at Hakari and Nano's busts.
  • Naddy in Chapter 71 when Chiyo reveals that some of her classmates are underage smokers. She tries to hide it by claiming she can't handle soft drinks.
• Spoiler Opening: A minor example. The ending reveals Shizuka, Nano, and Kusuri's names before they come up in the show itself (having already been foreshadowed in Episode 1).
• Sprouting Ears: Karane sprouts a cat's ears and tail after seeing a cat in Chapter 2, which the anime makes more prominent.
• Squee:
  • Hahari does this whenever she experiences a Cuteness Overload.
  • Kurumi does this whenever she gets the food she's craving.
  • Yaku does this whenever she sees antiques.
• Staircase Tumble: Rentarou tumbles down an escalator from seeing Iku in a dress in Chapter 60.
• Standard Female Grab Area: Discussed in Episode 6 of the anime. One of the creeps at the pool tries to grab Hakari by the arm, believing that its feel is comparable to the chest and is less taboo than the latter.
• Stating the Simple Solution: Karane asks whether Hahari can just exert her authority as chairwoman of the school to keep Iku's baseball team open despite it having only one member. In a rare act of maturity and responsible behavior, Hahari refuses to give the club any special treatment, because if she were to make an exception for one club, she would have to do so for every club in order to avoid playing favorites.
• Stepping Out to React: In Chapter 112, upon hearing that Mimimi intends to drop out of the muse-ical club's play due to the club president insisting on including a kiss scene where Mimimi kisses a fellow actor (i.e. the president), Rentarou calmly leaves the roof and ventures into a nearby forest, where he throws a tantrum over not wanting Mimimi to kiss someone she doesn't love.
• Strictly Formula:
  • The introduction of a new girlfriend follows a similar pattern each time. A chapter focuses on Rentarou encountering the girl, the two of them experiencing the Soulmate sensation, and Rentarou getting to know them in a one-on-one capacity, in the process discovering their odd quirks and winning their affection. The following chapter or two focuses on introducing the new girlfriend to the rest of the Rentarou Family, often engaging in some activity related to the character's interests and/or their quirks. For example both Mei and Mai, maids of the Hanazono household, were met with activities that included everyone dressing as a maid, while Rentarou and the girls assisted athlete Iku in a game of baseball. Once the activity ends, the new girlfriend reaffirms her love for Rentarou with a kiss.
  • While there are variations on the formula, the main exception is Hahari, who had everyone meet her pretty much simultaneously, with the Rentarou one-on-one following later.
• Stripperific:
  • Hakari's idea of a "freedom outfit" is a ribbon wound around her body to hide her private parts and melted chocolate hearts painted on her bare skin.
  • Meme wears the same outfit (minus the hearts) in an Imagine Spot in Chapter 76.
• Stumbling in the New Form: Hakari invokes this trope in Chapter 23 after she and the other girls undergo a "Freaky Friday" Flip. She and Nano have only slightly different builds, but she pretends to have trouble moving around as an excuse to flirt with Rentarou. Karane, on the other hand, struggles to stand up straight in Hahari's body, since the former is the main source of A-Cup Angst and the latter has the biggest boobs in the harem.
• "Success Through Sex" Accusation: Chapter 55 implies that a student was threatening to spin such a story about the school chairwoman in order to blackmail her. While she is a pervert with a fetish for cute things, she became chairwoman by simply buying out the school just to spend time with her new boyfriend.
• Sunglasses at Night: Rentarou wears these in Chapter 75, while trying to be manly.
• Super-Speed: The Vice-Principal, to the point where she's been called "The Hag Closest to Supersonic Speeds in this World".
• Surprisingly Realistic Outcome:
  • Kurumi is just a kid, so she can't enter an Eating Contest on her own without parental supervision. Fortunately, there Ain't No Rule that she can't join on a team with seven other people, one of whom is an adult.
  • When the girls join Iku's baseball team, Hahari, Mei, and Kurumi can't, because they aren't high school students. Hahari and Mei are adults, and Kurumi is in middle school. Fortunately a little pleading from Rentarou and a very relaxed referee gets them to play anyways.
  • The brief interlude where Toruru blackmails Hahari is an indicator of the fact that yes, what Hahari does on a normal basis would be a crime in a more realistic manga, and if word were to get out that she was in a poly relationship with students from her school (up to and including her own daughter) and several middle schoolers, everyone would be destroyed by the social fallout.
  • After attacking a pair of Chiyo’s classmates to get them to stop smoking in the park, Naddy is confronted by two police officers called in response to the commotion she caused.
  • The bocky sticks in Chapter 86 are made extra long so the bocky game contestants wouldn't know who grabbed the other end, but they all break under their own weight as soon as the game starts.
  • In Chapter 96, Hahari buys an expensive vase to display in her office that she thinks Yaku would enjoy. It turns out that its design is not the only reason why it’s so expensive; it’s also because it’s big enough to fit at least five or six people inside of it.
  • Just because one of your female enemies fell in love with you doesn't mean every female enemy you meet is going to fall in love with you.
  • Tama quit her job because she didn't like having to go to work every day. Without a source of income to buy food, she would've starved to death if Rentarou hadn't met her.
  • More than one joke revolves around the difficulties of remembering every member of a massive group of people. Chapter 168 in particular introduces a brand new character who acts as if she's been a part of the group the whole time, and while nobody recognizes her, nobody thinks to speak up out of the fear that they might have forgotten someone until Rentarou shows up and confirms that he has no idea who this new girl is.
• Suspiciously Specific Denial: Karane denies to Rentarou that she and the other girlfriends (absent Shizuka) tried to peep on him when, as far as he was concerned, they were not doing anything. This immediately tells him what actually happened and the other girlfriends actually facepalm at Karane.
• Symbolic Cast Fadeout: Inverted. The anime shows group shots of the titular girlfriends, with those who have joined the harem in the anime being filled in, while those who have yet to join are shown as silhouettes.

T-Z

• Tag Line: "The love comedy where nobody loses." Alternatively, "The naive harem romcom with zero losing heroines!"
• Take That!: In Chapter 26, Rentarou calls bubble tea "pandering to selfie culture".
• Taste the Rainbow: Exaggerated. As more and more girlfriends are added to the harem, the number of unique personalities among them expands as well. Take a look at the Characters pages to see the full extent.
• Team-Based Tournament:
  • Rentarou's girlfriends are a Taste the Rainbow pack that continuously grows with each passing volume. Whenever they compete against a large group, the Opposing Sports Team they've faced the most is the Gorira Alliance, whose members all look alike except for the leader and her boyfriend. While they first compete in a bouquet toss at a park, and second in an Eating Contest, they're all on good terms with one another when they're not participating in any contest.
  • Iku's introductory arc consists of Rentarou and the girls playing baseball against Jurassic High's baseball team, whose members are closely themed around dinosaurs. The pitcher manages to dislocate Iku's shoulder with one of her pitches, and the catcher demeans Shizuka in an attempt to invoke the mercy rule for the game. The latter quickly proves to be a huge mistake for Jurassic High. Though after the game, all hard feelings on both ends are dropped
• Team Kids: Among the titular girlfriends:
  • Shizuka, who everyone else strives to protect if she's hurt physically or emotionally.
  • Kusuri, whose attempt at an immortality drug left her in a child's body. (Though she can temporarily age herself up to her actual age of 18.)
  • Chiyo, the youngest of Rentarou's girlfriends.
  • Kishika, who mentally regresses to infancy whenever she gets pampered by someone else.
  • Matsuri, who shares a class with Chiyo.
  • A moment halfway through chapter 61 features Shizuka, Kusuri, and Chiyo chatting with Rentarou watching from afar, happy that the normally rigid Chiyo can lower her guard with friends she can be a kid and act her age with... only for the narration to remind everyone that Shizuka and Kusuri are 3 and 6 years older than Chiyo, respectively.
• Tears of Joy: Rentarou is prone to doing this frequently. In one chapter when the girlfriends reaffirm their love for him, he cries so much the rooftop gets flooded.
• Technicolor Eyes: Nano and Rin have red eyes. Mei has hypnotic, rainbow colored eyes.
• Teen Rebellion: In Chapter 44, Hahari tries to pass off Kurumi constantly rebuffing her as a rebellious phase, even though A.) it's already been established that Kurumi is being irritated by a craving for a French kiss, and B.) Kurumi's disgust with Hahari has been present for as long as they've known each other.
• Terminal Transformation: Discussed. While Kusuri's Magic Antidote can reverse most of her drugs' effects, the baby transformation drug would kill the user if neutralized within an hour, and the body shrinking drug would kill the user if neutralized before it wears off.
• Terse Talker: Invoked in Chapter 127. Kusuri creates a drug that limits the characters to saying two words at a time to prevent the dialogue balloons from blocking everyone's swimsuits during a date to a night-pool.
• Test of Pain: In Chapter 89, Mei and Iku participate in an ascetic training regimen created by the Serious Group, the former in the hopes of being able to better serve Hahari and the latter to feed into her masochism. The training is described as so hellish that only one person ever managed to complete the entire regimen, with such exercises as doing a hundred cleaning laps, meditating under the watch of a machine that smacks them if they lose focus, chanting prayers at the top of their lungs, simple meals that are difficult to eat, and Meditating Under a Waterfall that's only just warm enough to avoid causing hypothermia. The two of them are the only ones in the trainee group still standing in the end, and after they leave, it's revealed that the one other person to complete the regimen was Rentarou.
• Thanks for the Mammary: Rentarou accidentally gropes Hakari's breasts during the kissing game in Chapter 2.
• That Came Out Wrong: In Chapter 66, Mei pulls what looks like a rear end out of the potluck, and Rentarou announces that that's what he added. He then has to quickly clarify that it was supposed to be heart-shaped ham, and that the bottom part must have gotten cut off.
• Themed Harem: See Cast Full of Crazy further up? That's the theme. Although the harem covers a rainbow of personalities, body types, and traits, they're all misfits and weirdos of one stripe or another, be it physically, mentally, and/or socially, who find friendship and family with each other.
• Thunder Shock: Accompanies a ZING!! sound effect whenever Rentarou locks eyes with a Soul Mate.
• Title Confusion: With the title being so long, most everyone, including the creators, uses an abbreviation:
  • The Japanese side uses "100人の彼女" (Hyakunin no Kanojo, or "100 Girlfriends") or "100カノ" / "Hyakkano" (a portmanteau of Hyaku (100) and Kanojo).
  • The English side uses "100 Girlfriends" or "100GF".
• Title Drop: Karane and Rentarou in Chapter 18 when subjected to Hahari's Lie Detector chair.
• Tongue Suicide: Mei attempts this in Chapter 59 after accidentally breaking a drug vial intended to help the girls escape the photo booth.
• Tournament Arc: Parodied with the Eating Contest starting in Chapter 25, which has multiple rounds and a system of Scoring Points, such that actual strategy is required, and ignoring that one would be sated very quickly in reality.
• Toy-Based Characterization: In Chapter 29, Kusuri plays with a Pentarou doll with the other girls. She's quite enthusiastic about it for the majority of the chapter, though she briefly becomes embarrassed about doing so when she temporarily ages herself up during the play session.
• Trailers Always Spoil: Zigzagged. The anime's promotion has no problem revealing (most of) the girlfriends, but if they have a big reveal or development in their intro, it's kept secret (e.g. Shizuka using her phone to talk).
• Training from Hell:
  • The Gorira Alliance regularly set off fireworks in their mouths as training to eat spicy food.
  • Iku actively seeks out opportunities to do this, as part of her belief that pain is good for you.
• Transformation Sequence: In Chapter 29, Kusuri takes the neutralizer to turn back into her 18-year-old self, and calls out, "Transformation sequence!"
• Trauma Button: After Nano gets shrunken in Chapter 72, Yamame puts her stilts on and nervously tells herself that she isn't gonna step on Nano. Yamame wears stilts in the first place because she stepped on a bug when she was young.
  Momiji: This seems like a sore spot for you.
• Trivial Tragedy: When she was a little girl, Yamame accidentally stepped on a bug, squishing it. The incident devastated her so much that her father had to hypnotize her in order to break her out of her guilt-ridden state, and then teach her to walk on stilts so she could feel more comfortable about working in the garden.
• True Companions: There are several occasions where the harem demonstrates that calling themselves a family isn't just for show:
  • In Chapter 15, Rentarou decides he's going to rescue Hakari and go on the run together to try and escape her mother, and asks the rest of the harem - Karane, Shizuka, Nano and Kusuri - if they'll wait for them. Instead, they say they're coming with them, knowing they're giving up on their families, homes, and school.
  • Rapko undermining Shizuka's self-confidence in Chapter 35 during the baseball match against Jurassic High triggers the family's collective Berserk Button, and they go all-out to make a comeback.
  • The family collectively volunteers to protect Meme from the newspaper club in Chapter 55.
  • The relay race in Chapter 99 showcases how the harem has become this for its members; they've spent so much time together, and have become such close friends, that they're able to operate in sync without communication. The efforts and expectations of the rest of the harem encourage each member to do their best.
• Tsundere:
  • Karane Inda, to parodic degrees. This includes being a Bad Liar. (It turns out her whole family's absurdly tsundere too.)
  • Kurumi Haraga is grumpy and hostile to everyone when she's hungry, but apologetic and demure when fed.
  • Kishika Torotoro tends to react with hostility if she thinks she'll be provoked into an infantile state.
  • Mai Meido adamantly insists that she hates Rentarou for being inferior to Mei in her eyes, but her real love for him always bleeds through.
• TV Genius: Kusuri is able to invent drugs that can do anything, such as magnetizing the iron in your blood, accidentally turning people into kissing-zombies, deaging herself and her family to children, and swapping people’s bodies. And all of them can be neutralized with a single Magic Antidote. Rentarou even calls her "Doraemon" at one point.
• Twerp Sweating: Hakari's father appears to Rentarou as a ghost with the intent to scare him. However, Rentarou's overwhelming decency and courtesy purifies Father in Law's soul and sends him to heaven against his wishes.
• A Twinkle in the Sky: The pharmaceutical spy becomes this in Chapter 74 after being punched by Kusuri's father.
• Two-Timer Date: Rentarou thinks that he can 100-time all his girlfriends. He quickly rejects the idea as it would be cruel.
• Unaffected by Spice: The Yakuzens test various prototype drugs on themselves on a regular basis, resulting in this trope.
• Under Strange Management: Hahari buys out Rentarou's school to become the new chairwoman the day after she falls in love with him. Owing to her adoration of anything she finds cute, at least two of the teachers owe their jobs to her, one of them being hired because Hahari thought she was cute, and the other a hedonistic drunkard who lives in a tent in the school garden. It turns out that it's policy at Hanazono companies to hire people if they're cute, no questions asked.
• Undying Loyalty: Mei's complete devotion to Hahari is a result of her Dark and Troubled Past having virtually obliterated her sense of self. Not only can almost nothing catch her off guard, but she literally can't understand the concept of not following orders.
• Unexpectedly Dark Episode:
  • Volume 4's extra chapter features Mei's backstory and why she's so loyal to Hahari, which inclues Mei being thrown out by abusive parents and collapsing in the snow outside the Hanazono household. When Mei wonders why Hahari even cares, Hahari encourages her to live and later takes her in. Humor is still present as, before going into the tale, Mei warns everyone that it was cut from the main story because it clashed too heavily with the manga's normal tone, but it's okay to tell it in the extra chapter, and Hahari breaks the somber mood by revealing she did everything she did because of how cute Mei was. Mei is, predictably, overjoyed by the praise.
  • Ch. 134-135, in which Rentarou and Shizuka must confront Shizuka's mother, is easily the soberest story in the manga thus far, more than even Hahari's introduction in Vol. 3 (which was still peppered with zany jokes throughout). Most of the harem make only background cameos in the first part and are completely gone in the second, the conflict in Shizuka's family is played deadly straight, and the few jokes are very gentle and low-key.
  • Chapter 164 goes from a Festival Episode to a horror story, as Matsuri runs afoul of a divine Jerkass Genie.
• Unexpectedly Obscure Answer: The Teddy Baby quiz is composed entirely of this sort of question.
• Unfortunate Search Results: Rentarou tries to search online for stories about people's lives being ruined by cabbage addiction when the girls get addicted to addictive cabbage. But because the situation Makes Just as Much Sense in Context, his search yields zero results.
• Universal Group Reaction: All the girls tend to react with a simultaneous "THROB!" whenever Rentarou affirms his love for them.
• Unlimited Wardrobe: Hahari loves dressup and has a gigantic closet filled with everything from costumes to baby clothes. If she doesn't have something specific, she'll pay for it to be tailored overnight.
• Unspoken Plan Guarantee: Rentarou comes up with a convoluted and detailed scheme to use blindfolds, dice rolls, and careful choreography to completely obfuscate which of Hakari or Karane he kisses first. Naturally something spoils every attempt and they eventually give up (after a lot of pain and embarrassment on all sides).
• Unstoppable Force Meets Immovable Object: In the sports festival arc, Uto is tasked with producing a spear that can pierce any shield and a shield that can deflect any spear. Her answer? A plastic fork and a paper plate. She reasons that the strongest spear wielder could pierce anything with a plastic fork and the strongest shield bearer could deflect anything with a paper plate. And it works.
• Unusual Hiring Practices: Hahari has been shown to hire at least a few people because she thought they were cute, either as staff at her mansion or as faculty at Rentarou's school. Her companies do this too, as they also hire people based on how cute they are.
• Unusually Uninteresting Sight: Granted that a lot of the mains' weirder adventures tend to happen away from the general populace, and the whole world got covered in one person’s hair at one point, but this still crops up several times. Chapter 72, for instance, has Nano going through a whole school day six inches tall without raising a single comment from anyone outside the mains.
• Verbal Tic:
  • Kusuri has a habit of saying "yep, yep!" at the end of her sentences ("nanoda!" in Japanese), which was originally translated as "yeppers!". She even says it in her sleep.
  • The leader of the Gorira Alliance adds "uho" to the end of her sentences.
  • Mimimi adds "naturally!" to the end of her sentences. She even says it in her sleep.
  • Naddy tends to say “ya hear?” at the end of her sentences quite a bit.
  • Yamame is prone to saying "aye" quite a lot.
  • It seems to run in Kusuri's family. Her mom says "Mm-hmm" and her dad says "uh-huh".
  • Yaku adds "yes yes!" to the end of her sentences ("nanoja!" in Japanese).
  • In Chapter 71, Akogare and Manesu add "bloomin' tosser" and "bleedin' muppet" to the end of their sentences, respectively.
• Versus Title: Several chapter titles:
  • "Rentarou's Family vs. Challenge Ramen"
  • "Rentarou's Family vs. The Quad Town Public Sports Festival"
  • "Rentarou's Family vs. Kiraisugi's Athlete Corps"
  • "Yaku vs. Kishika vs. Rentarou"
  • "Rentarou's Family vs. Youkai (It's Basically Total Youkai War)"
• Vignette Episode:
  • Chapters 120, 130, 157, and 165 spotlight the activities of various groups of girlfriends.
  • Chapter 153 has the thirteen girlfriends from Yamame to Himeka each checking in with one of their thirteen predecessors for advice on performing as idols.
• Violence is the Only Option: Naddy believes this in Chapter 71, suggesting that Chiyo beat up her classmates if they refuse to listen to her about smoking. Chiyo reprimands her, telling her that violence is out of the question. Pages later, Naddy threatening to tie them up and Chiyo head-butting Naddy to stop her is what straightens them out.
• Voices Are Not Mental: It's clear from the dialogue that when the girls switched bodies with each other in Chapter 23, the voices remained in their original bodies.
• Vomit Discretion Shot: Takeko Deluxe throws up after the Eating Contest, but her vomit is pixellated.
• Wacky College: Wacky Elevator School version. The current chairwoman bought the school on a whim, is accompanied to work by her maids, and is obsessed with cute things; the Vice-Principal stalks the halls looking for male students to forcibly kiss; the ethics teacher and groundskeeper is a homeless alcoholic who lives in a tent on the grounds; and one of the Japanese teachers dresses like a stripperiffic cowgirl and speaks horribly broken Engrish. Regular visitors include a woman who rejected her humanity to become a cat and now wears cat ears and a tail, and the chemistry club president's grandmother, an 89-year-old who looks like an 8-year-old. Then there are the students...
• Wacky Parent, Serious Child: Hiro and Chiyo. Hiro is an avid Chiyo fan who'll go to extreme lengths to cheer her on, and is firmly on board Rentarou/Chiyo, doing everything he can to get them closer together. Chiyo, on the other hand, is a serious and diligent Class Representative who takes care of the house, and is one of the harem's straight women.
• Wall of Text: Played for Laughs in Chapter 37. After each of the current girlfriends tell Rentarou all the things they love about him, Rentarou fires back with a massive two-page list of every single thing there is to love about them.
• Wardrobe Malfunction:
  • Both Rentarou and Iku lose their clothes to Terano's fastball.
  • In Chapter 78 this happens to Hakari. She's uncharacteristically embarrassed because a dirty rooftop is not a sexy setting to bare herself.
• Weaksauce Weakness: The "Soulmate Sense" doesn't go off unless both Rentarou and the prospective soulmate make eye contact and can see each other clearly. The first time this is shown is with Hahari, where despite having a clear line of sight with each other and having a conversation, it isn't until the drug he took to see infrared wears off and he can see her that the "sense" goes off.
• Weddings in Japan: Rentarou and the girls decide to perform a mock wedding in Chapter 146 in a mix of Japanese and Western wedding wear. Half of the girls wear Japanese wedding dresses, and the other half wear Western wedding dresses, while Rentarou splices Japanese and Western groomswear together Two-Face-style.
• Weight Woe: Played for Laughs at the start of Iku's intro chapter, where all the girlfriends realize the Eating Contest from a few chapters ago did, in fact, leave its mark. Hence, they go off to do some "secret cuteness training" (even dragging along Kurumi, whose metabolism defies weight gain, and Mei, who hadn't even participated), allowing Rentarou to meet Iku by himself.
• Wet T-Shirt Contest: Hahari organizes one—but with Maid uniforms instead of shirts.
• We Want Our Jerk Back!: The three-chapter arc leading into Ch. 50: After Karane loses her Tsundere-ness thanks to a drug, while everyone is charmed by her new sweet behavior at first, they soon all agree that they prefer the old her.
• Wham Line:
  • Chapter 14: What starts off as a simple Bouquet Toss episode pivots on its last line, when Hakari makes a simple request:
    Hakari: Rentarou-kun...would you...please break up with me?
  • Chapter 57: Rentarou sees through his newest soulmate, Naddy's, Dark Secret:
    Rentarou: You really are Japanese, aren't you?
  • Chapter 134 has Shizuka suddenly without her phone. It isn't until she shares a bath with Nano that we see why in a flashback:
    Shizuka's Mother: Shizuka... give me your phone.
  • Chapter 168: As the chapter goes on, it becomes apparent that there's a new girl in the group that nobody recognizes, both in-universe and out. The audience might be forgiven for thinking that they've accidentally skipped a chapter (especially since the weekly release skipped a week), or that Rentarou met her offscreen and didn't introduce her yet. Then Rentarou disabuses us of that motion by asking a question that's likely on the audience's mind as well. What makes this especially shocking is that it leaves the audience questioning if this girl is even a girlfriend.
    Rentarou: Who are you?
• Wham Shot:
  • The last panel of Chapter 17, where Rentarou Zings with Hahari, showing that his girlfriends won't just be girls his own age.
  • At the start of Chapter 51, Rentarou Zings with Chiyo, showing that his girlfriends include relatives of his own family.
  • Subverted in Chapter 74. Kusuri invites Rentarou to her home to meet her parents. Aware of the previous two Wham Shots, Rentarou braces himself for a Zing with Kusuri’s mother... and nothing happens. But then, Kusuri’s grandmother comes home and—ZING!!
  • The end of Chapter 94, where Rentarou runs into Uto wearing the school uniform after what he thought was a long-term farewell the day before, revealing she's not actually a Wandering Minstrel, she's a Chuunibyou.
  • The end of Chapter 134, where Rentarou doesn't Zing with Shizuka's mother.
• White Is Pure: In her first appearance, Mimimi is dressed entirely in white, and the first thing she does when she meets Rentarou is buy him a white outfit. It's later shown that she values inner beauty just as much as she values outer beauty.
• Who Writes This Crap?!: In Chapter 35, Karane yells "Screw this manga!" when the opposing team openly cheats during a game.
• Wingding Eyes:
  • Many characters get heart eyes when experiencing extreme loving emotions; this's best shown on the manga covers, where every girl with visible eyes has heart eyes.
  • Himeka has four-pointed stars in her eyes, in a nod to Oshi no Ko, replacing the standard gleam other characters have.
• World Limited to the Plot: Only a handful of girls have appeared in the manga well before they joined Rentarou's harem.
• World of Technicolor Hair:
  • Seen whenever the series ventures into color. The Hanazonos have pink hair, Nano has silver hair, Yamame has deep green hair, Momiji has purple hair, Ahko has pale blonde hair shading to pink at the ends, and Uto's hair goes from dark blue-green to aqua. (Shizuka's finalized hair color may also count if seen as dark blue rather than a shade of black.)
  • Naddy's hair color varies, being either light green^note likely as a way to depict her particular shade of blonde, much as light purple can be used to depict silver hair in anime or blonde.
• World of Weirdness: The world around them is implied to be this. Whether it be Kusuri's drugs or anything the Serious Group produces.
• Wrestler in All of Us: Karane performs various holds on Rentarou when she's embarrassed.
• Writing Around Trademarks:
  • What the anime inevitably does to all the Ghibli references, beginning with the "Fortress in the Sky" example mentioned above. Said moment even has a picture of Laputa pixelated within an inch of its life.
  • The anime subs mash together Resident Evil and Biohazard, the international and Japanese names of the franchise, to create Resident Hazard: Kissage.
• Wrong Bathroom Incident: In Chapter 130, Rentarou's date with Ahko runs into a problem when the gal restaurant turns out to only have a girls bathroom, which Rentarou refuses to use.
• Years Too Early: "Tama" ^note Actually Yaku in Tama's body while the girls are doing a "Freaky Friday" Flip uses this teasingly in Chapter 149, saying Rentarou's ten years too young to stroke her belly.
• You Have GOT to Be Kidding Me!: Rentarou's reaction to getting love shocked at the sight of his cousin Chiyo Iin.
• You Taste Delicious: In a variation of the trope, Rentarou has this reaction after eating 24 breads that taste and feel like the girlfriends' characteristics (a Kusuri-Momiji collaboration). The girlfriends have a similar reaction to eating bread that tastes and feels like Rentarou.
• You Were Trying Too Hard: The ramen shop owner kept trying to change the restaurant’s challenge dish every time someone beat it, unknowingly catering each new iteration to be beaten by a different girlfriend.
• Yuri Fan: Shizuka has no issue enjoying erotic yuri fiction, and Mai looks to be really into it (or at least boss/subordinate yuri).
• Zany Scheme: Rentarou is prone to these in order to please his ever growing harem. Examples include:
  • Setting up a convoluted game to prevent his first two girlfriends from feeling jealous of the other having his first kiss. (It doesn't work out.)
  • Copying an entire book series by hand for a text-to-speech app for another girlfriend's phone.
  • Breaking into the home of a wealthy family to rescue a girlfriend whose mother wants to cut all ties with him.
  • Improvising a particular recipe to satiate a girlfriend's appetite, burning himself in the process.
  • Stripping down to a loincloth to prevent a girlfriend from overworking herself from training for an upcoming game.
  • Hideously deforming himself during a beauty seeking contest in order to force a draw between the contestants.
  • Setting up a Body Double to satisfy a girlfriend's desire for a French Kiss without her getting a headstart on him.
  • Sewing and rigging multiple life-size puppets to make the audience bigger during a concert. Twice.
  • Standing all his girlfriends on dirt piles to placate the newest addition's height insecurity.
  • Helping Nozawa-sensei draw the manga to tense up his body so that his new girlfriend can practice massaging males.
  • Developing a DJ persona and routine to convince middleschoolers not to smoke. (Fortunately, he doesn't wind up needing to use it.)
  • Studying an old kids show front to back in order to pass a trivia game during a date.
  • Removing numerous degenerates from a forest to prevent them from crossing the paths of his most kindhearted girlfriends.
  • Staging atmospheric conditions to bypass the publisher forbidding the girls to drink fake beer.
  • Playing every male role in a beauty play when all the male actors become crippled by a girlfriend's beauty.
  • Dressing up as a girlfriend's homemade life-size plushy to avoid feeling jealous of it getting more of her attention than him. (In this case, said girlfriend actually anticipates Rentarou doing something wild and possibly life-threatening to solve the problem; this was actually her compromise.)
  • Shaping his body into different numbers to appeal to a girlfriend's Number Obsession.
  • Taking up various physical tasks to ward off an Occidental Otaku trying to court one of his girlfriends.
  • Helping a construction crew finish their work faster so he and his girlfriends could make it to their date on time.
  • Training himself to be a "mommy" to his latest assortment of babyfied girlfriends.
• Zettai Ryouiki: This is Momiji's favorite part of Naddy, the space between her shorts and chaps.
• Zombie Gait:
  • Inverted in the kissing zombie arc. The kissing drug that turns the girls into kissing zombies actually makes them run faster than normal.
  • Played straight in Rin's introductory arc, where the girls play zombie nurse tag to break in the new member.

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