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[[caption-width-right:350:The protagonist isn't in the picture, but we all know you're just here for the monster girls anyway. [[note]]Clockwise from top: [[SpiderPeople Rachnera]], [[SlimeGirl Suu]], [[HarpingOnAboutHarpies Papi]], [[SnakePeople Miia]], [[OurCentaursAreDifferent Centorea]], and [[OurMermaidsAreDifferent Mero]].[[/note]] ]]

''Daily Life with Monster Girl'' is a manga written by Website/{{Pixiv}} artist Takemaru "Okayado" Inui about Kimihito Kurusu and the monster girls he is hosting, a [[SnakePeople lamia]] named Miia, a [[HarpingOnAboutHarpies harpy]] named Papi, a [[OurCentaursAreDifferent centaur]] named Centorea ([[AffectionateNickname a.k.a. Cerea]]), a {{slime girl}} named Suu, a [[OurMermaidsAreDifferent mermaid]] named Meroune, an [[SpiderPeople arachne]] named Rachnera, and a [[HeadlessHorseman dullahan]] named Lala. And this group's only getting bigger.

Three years ago, the government [[UnmasquedWorld revealed the existence of monsters to the world]] and began working to integrate the two societies. Just like human cultural exchange programs, some humans have been sent to live with monsters, while some monsters are now living with humans. Due to an error, Miia ended up at Kimihito's house by mistake, but her case worker is too lazy to fix it. Over time, Miia ended up falling for Kimihito, but due to the laws governing the cultural exchange program, if they ever consummate their relationship, she'll be sent back to her own country.

Things get even ''[[UpToEleven more]]'' complicated when the [[UnwantedHarem other girls]] arrive...

This series has a [[http://dailylifewithamonstergirl.wikia.com/wiki/Daily_Life_With_A_Monster_Girl_Wiki wiki]].

And there is good news for English-speaking countries; Creator/SevenSeasEntertainment has licensed the series under the title ''Monster Musume'' and started releasing it. Several volumes are available already, and most of them topped the New York Times manga charts!

The anime began airing in summer of 2015, titled ''Everyday Life with Monster Girls'', [[http://www.sentaifilmworks.com/news/sentai-filmworks-licenses-monster-musume and has been licensed to]] Creator/SentaiFilmworks. See the preview [[https://www.youtube.com/watch?v=G-IfYF_oesk here.]] Crunchyroll is also streaming the anime, which can be [[http://www.crunchyroll.com/monster-musume-everyday-life-with-monster-girls viewed here]] for folks in the following regions: [[note]]USA, Canada, UK, Ireland, South Africa, Australia, New Zealand, Latin America, the Netherlands, Scandinavia, and Turkey.[[/note]]

In December 2015, DMM launched a free-to-play browser game with a similar style to VideoGame/KantaiCollection and some RenAi elements under the title VideoGame/DailyLifeWithMonsterGirlOnline. Sadly, it was [[https://twitter.com/monmusu_online/status/786814893227859968 announced]] that the game would be shutting down on November 22, 2016.

The series' four official Japanese anthologies were licensed by Seven Seas under the title ''Monster Musume: I ♥ Monster Girls'', and released from May 2016 to March 2017.

An OVA was released in November 2016, featuring an extended anime adaptation of Chapter 17 of the manga. A second OVA was released in April 2017, featuring an anime adaptation of Chapter 26.

This manga is a BleachedUnderpants work based on the author's previous online hentai manga shorts, ''Living with Monster Girl''; please do not post tropes applying to that one.

Now has a [[Characters/DailyLifeWithMonsterGirl character page]] that is sure to [[NeedsWikiMagicLove need love]] as time goes on.

For Okayado's other works with monster girls, see ''Manga/DeadlineSummonner'' and ''Manga/TwelveBeast''.

!!''Daily Life with Monster Girl'' provides examples of:


[[folder:Tropes A to D]]
* AccidentalMarriage: Centaurs have strict rules about only letting one's "master" ride on their backs. Naturally, Kimihito finds this out right after he spends most of chapter 4 riding Centorea.
* ActionGirl: The special ops, with special mention to Zombina who totes uzis.
* ACupAngst:
** Manako's response to finding out that a 103cm I-cup bra was insufficient to contain Centorea is to go into shock and grab at the air in front of her chest. Even the fairly buxom Miia and Rachnee are slightly alarmed.
** Tionishia tries to cheer her up by saying small breasts aren't bad. Doppel points out Tio can't understand what it means to be flat since her own bust is 160cm, which is big enough to make Centorea seem flat by comparison.
** Centorea herself, believe it or not, suffers from this slightly when she meets Cathyl, a minotaur who she is displeased to note is bustier than her. Though it should be noted that Tionishia is also bustier than Centorea, but she's never had a problem with her[[note]]Perhaps because Tio's uniform is fairly modest while Cathyl wears a skimpy bikini top, plus Cathyl is even bigger than Tio both overall and has a bust 11cm bigger than her as well.[[/note]].
* AdaptationInducedPlotHole:
** In the manga, Cerea drags Miia along so they can search for Lala's head, while the anime has Miia frantically volunteer herself just to not be left with the headless body. Both versions display that she's much more terrified of the head (even just knowing that there's one lying around), so she should have believed that staying with the body was the lesser of two evils, though it is hinted that it's the absence of Kimihito when something scary is happening that she's most afraid of.
** In the anime, the episode that has Kimihito help Miia with her shedding takes place after Suu and Mero have joined the household, whereas in the manga, the chapter took place beforehand. This creates the plothole of Suu being badly affected by Miia's cooking despite it being shown in episode 12 that she can eat poisonous plants just fine (albeit becoming poisonous herself).
** In the anime, the episode that has Kimihito catching a cold happens after Rachnera has joined the harem, instead of before like the manga. This gets lampshaded when she finally tires of the squabbling of the other girls and webs them all up, only to have Suu run off to "help" Kimihito before she can deliver any instructions of her own.
* AdaptationalModesty: Let's put it blandly: the single page comics that started it all were barely even PornWithPlot[[note]] and even then entirely on the basis that they focused less on sex and more on the comical SliceOfLife situations that might emerge from living with a non-human person[[/note]]. The anime falls into the ecchi category (albeit pretty heavy ecchi).
* {{Adorkable}}: Meroune. Centorea has her moments, too.
* AllMenArePerverts: Not even Kimihito is above this. He may have superhuman self-control, but we get numerous looks at his internal monologue as the girls try to charm him and they show that he does, in fact, have a working pair down there.
* AllMythsAreTrue: All ''monsters'', at the very least.
* AllThereInTheManual: The [=MonMusu=] Collection [[http://imgur.com/a/MyfIP end-cards]] in the anime, which give detailed facts about different extra-species:
** The first expands on [[SnakePeople lamia]] as well as their sub-species, like echidna (which have venom like vipers) and melusine (a winged type).
** The second shows [[HarpingOnAboutHarpies harpies]] and their sub-species, including raptors (carnivores that are more like eagles or hawks) and poultry (which are essentially chickens in harpy form).
** The third covers [[OurCentaursAreDifferent centaurs]] and their sub-species, which include lightweights (aka racing centaurs, a fragile type built for speed) and heavyweights (built for size and strength).
** The fourth looks at [[SlimeGirl slimes]] and their sub-species, such as red slimes (an acidic type with the personality to match) and green slimes (a poisonous type who can't keep full humanoid form).
** The fifth is about [[OurMermaidsAreDifferent mermaids]] and their sub-species, among them sharks (who have a skeleton made of cartilage in their lower bodies) and fresh water class (who travel between rivers and oceans like salmon).
** The sixth looks at [[SpiderPeople arachne]] and their sub-species, like small breeds (which are small and good at jumping like jumping spiders) and large breeds (which are larger and covered with hair like tarantulas).
** The seventh explains Monoeyes and their sub-species, like the {{Cyclops}} (who are larger than the others) and the [[Manga/GeGeGeNoKitaro Backbeards]] (who have a variety of eye powers like hypnosis and EyeBeams).
** The eighth covers [[OurZombiesAreDifferent zombies]] and their variants, such as [[{{Mummy}} Mummies]] (who often have difficult personalities due to being former royalty) and {{Chinese Vampire}}s (''jiangshi''; who practice tai chi to ward off joint stiffness).
** The ninth discusses [[OurOgresAreHungrier ogres]] and their relatives, such as [[AllTrollsAreDifferent trolls]], which are bigger and more muscular than regular ogres; and [[OurGiantsAreBigger gigantes]], which are even bigger and stand more than 10 meters high.
** The tenth discusses [[DraconicHumanoid dragonewts]] and their relatives, such as Ryu-jin, which are a wingless Eastern-dragon species, and wyverns, which have their wings on their arms and can actually fly with them. The card also has {{doppelganger}}s, who have no sub-species mentioned.
** The eleventh covers [[PlantPeople dryads]] and their relatives, such as alraune, who are flower-based, and mandragora, who are a root-based species known for their extremely loud screams. The card also has [[HeadlessHorseman dullahans]], who have no sub-species mentioned.
** The twelfth is about the various long-lived and slightly out-of-fashion subspecies of [[OurDemonsAreDifferent devils]], such as greater devils, who look like [[SubculturesInJapan Kogals]] from the 90s, and elder devils, who look like disco dancers from Japan's bubble economy in the late 80s. The card also has kobolds, who have no subspecies mentioned.
** The manga also has pages after the story is done devoted to explaining the physical traits and societies of different monster girl types: for example, kobolds have a near monopoly on the world's cobalt supply, making them all extremely wealthy. This is why Polt is able to afford to build her massive gym and stadium.
* AllWomenAreLustful: TheSeries, ''God dang it''. Those who are not in for outright sex will tease the protagonist to no end. Chapter 31 shows that they're all genuinely oblivious to the idea that most girls ''wouldn't'' like mixed baths.
* AmusingInjuries: In chapter 5, Kimihito walks into the kitchen, and has a big u-shaped hoofprint on his face. He explains to Miia that he accidentally walked in on Centorea while she was bathing after her morning exercise. Later Miia has hoofprints all over her as well when she tries to stop Centorea from running away, with Kimihito, from filling out her [Centorea's] homestay application. And then there are all the times Kimihito gets crushed by doors...
** Zombina as well, since already being dead she can survive them. She takes her hand falling off as one would their wrist watch coming loose.
* AnimationBump: The anime already had good animation, but the twelfth episode pulled out all the stops, featuring many fluid and elaborate animations.
** The animators included an amusing reference to this, with Kimihito destroying the infamous [[http://macrochan.org/search.php?tags=QUALITY%20Cabbage QUALITY Cabbage]] (which became a symbol of cheap animation) during his "food rampage" at the end, as to signify that they are against cutting corners and half-assing things.
* ArbitrarySkepticism: Despite being extra-species themselves, the girls have a hard time believing that dullahans are anything other than an old myth, even after Lala turns up. Kimihito lampshades this by saying something like "You guys are in ''no'' position to talk.".
* ArentYouGoingToRavishMe:
** Most of the various girls that move in with Kimihito really want to have sex with him. But due to a combination of him being AboveTheInfluence, and also being thrown in jail if he did do it with them, he never takes advantage of them, even when they practically throw themselves on top of him.
** There have actually been several occasions where sex would have likely occurred (Kimihito even noting his resistance to his sexy roommates has its limits), only for an AmusingInjury or InterruptedIntimacy to occur. The chances of a successful seduction get lower as more monster girls start living with him, because while most of the girls would jump at the chance for a romp in the sheets (or on the floor, or anywhere really) with Kimihito, they, similarly, will stop at nothing to keep the OTHER girls from getting intimate with him. Miia and Cerea in particular are prone to protecting his "purity" (for themselves, that is).
* ArtShift: In episode 3 of the anime Miia, Papi, and Centorea are about to fight each other for Kimihito's affections. They are rendered as creepy, [[Anime/PuellaMagiMadokaMagica Madoka]]-esque blobs of color with no pupils, moving in an unnatural way. The scene also ends in a PastelChalkedFreezeFrame.
* ArtisticLicenseBiology: All over the place. Then again, monster people were considered fictional to humans until a while ago. There might be an explanation for how their bodies work in their world, though they wouldn't necessarily work in the real world. Likely justified due to [[AWizardDidIt supernatural elements]]; after all, it's not as if [[OurZombiesAreDifferent Zombina]] or [[HeadlessHorseman Lala]] could even be "alive" otherwise.
* AudienceParticipation: The author adds in new {{Cute Monster Girl}}s to Kimihito's harem based on the readers' votes.
* AuthorAppeal:
** Guns seem to be one of the author's appeals, given the [[GunPorn exquisite amount of detail with which he draws them]].
** Having the characters wear ''Franchise/MetalGear'' outfits, as he's twice had Miia dressed as Snake and Rachnee once dressed in [[VideoGame/MetalGearSolid3SnakeEater The Boss]]'s sneaking suit.
* AuthorAvatar: In a bonus chapter for chapter 8, the author is portrayed as a hermit crab. He even gets a cameo as a plushie in some panels.
* AwesomeButImpractical: Manako has a transforming BriefcaseBlaster. However the bonus chapters at the end explain that it's riddled with so many flaws that only a few prototypes were produced before the project was scrapped.
* BalancedHarem: All the girls have their equal take of ShipTease with Kimihito. Kimihito freely admits to himself that he'd enjoy being married to any of them.
* BarbieDollAnatomy: The broadcast version of the anime does a good job of not drawing too much attention that it's somewhat censored, unlike the manga, but this trope is particularly glaring when Kimihito goes on a fake "date" with Zombina; she unstitches her breast, causing it to flop onto the floor. Kimihito freaks out a bit when he picks it up and realizes what it is, but what's shown is a perfectly round, smooth, flesh-colored lump.
* BatmanGambit: The threat of "D" was thought up in order to make Kimihito closer to one of his girls so he can choose one. [[spoiler:[[AvertedTrope Unfortunately for Doppel, the plan's originator, the whole thing completely backfires.]] [[DidntSeeThatComing Instead of picking a single girl, he got closer to]] ''[[BalancedHarem all of the girls living with him]]'', and may have even captured the affections of her co-workers too.]]
* BeautyEqualsGoodness:
** So far, the biggest jerkasses of the manga are the racist couple, the director, and the orc gang. [[{{Gonk}} None of them are pleasant to look at]].
** Averted by Rachnera's initial host family. They look like fairly normal, decent people, but they sold her off because she wasn't what they were expecting.
*** Chapter 26 also mostly explained the reason why they sold her off. Along with the above, it is revealed Rachnera accidentally cut the daughter's face with her [[AbsurdlySharpClaws claws]]. It seemed this was the deciding factor into their belief that they truly could not live together.
** Also averted pretty hard by Draco, and even harder by [[spoiler: [[GodSaveUsFromTheQueen Mero's mom.]]]]
** Apparently played straight by Kiira the Killer Bee. She's the most serious and least attractive villain introduced so far. She instantly tries to kill Kimihito with her stinger and has a nightmarish insectoid face and arms that are covered in a carapace that makes them look sinisterly skeletal. [[spoiler: Subverted in chapter 45, when it's revealed that she really wasn't trying to kill Kimihito and her venom isn't actually that strong - she just has a one-sided feud with Rachnera, who humiliated her by catching her in a web. When she was trying to cross into Japan, she saw Rachnee and began hurling threats at her, resulting in getting herself classified as a dangerous species. Once she's calmed down, she's also drawn in a much more human-looking and attractive manner, with a more human-looking face and more emphasis placed on her breasts and hips than her stinger and inhuman hands and feet.]]
* BedmateReveal: The very first scene of the series: Kimihito wakes up to find that Miia is in bed with him, having decided to use him as a warm body to warm herself up. Unfortunately, that also means her instinctive reaction to someone trying to wriggle free is to grasp him tightly in her coils. At first, this only means a MarshmallowHell, but Kimihito quickly faces the prospect of being crushed to death.
* BeeAfraid: Chapter 44 introduces the first of the three extraspecies girls that came illegally to Japan, Kiira the Killer Bee. She is based on the very dangerous ''ōsuzumebachi'' ([[https://en.wikipedia.org/wiki/Japanese_giant_hornet Japanese Giant Hornet]]), is treated almost without a trace of comedy, and wastes no time in going after Kimihito with her deadly sting.
* {{Bifauxnen}}: [[spoiler:[[http://www.mangahere.com/manga/monster_musume_no_iru_nichijou/c019/16.html Draco]] [[http://www.mangahere.com/manga/monster_musume_no_iru_nichijou/c019/31.html turns out to be one]]]]
* BiggerOnTheInside: Kimihito's house has enough space for every extra-species girl he lives with, including an Olympic-sized pool for Mero, a bath big enough for Miia's snake body, and rooms comfortable for both Cerea and Rachnera, and yet the house is never referred to as anything resembling palatial or a mansion.
* BigSisterInstinct: Surprisingly enough it's Papi who shows the most protectiveness towards Suu.
* {{Bishounen}}: [[http://www.mangahere.com/manga/monster_musume_no_iru_nichijou/c019/16.html Draco]] from chapter 19. [[spoiler:Although SHE turns out to be a {{Bifauxnen}}]]
* BizarreSexualDimorphism: Downplayed with centaurs; due to being a combination of BarbarianTribe and HordesFromTheEast for much of their history, only the strongest male centaurs survived long enough to breed. This "natural selection" caused the next generation of male centaurs to become more muscular, more violent, and (unintentionally) [[{{Gonk}} more ugly]]. However, in today's modern world, the war-specialized muscular brutes that are the male centaurs have fallen out of use, and female centaurs are looking elsewhere to find a mate.
** Orcs as well. The male orcs shown in the manga and anime look like anthropomorphized pig men, while the browser game features a ''much'' more comely [[http://vignette4.wikia.nocookie.net/dailylifewithamonstergirl/images/6/67/0015_full.png/revision/latest?cb=20151231010005 female orc.]]
** Chapter 49 shows some mummy men that look like goofy little men covered from head to toe in bandages; the mummy girl shown later is a sexy brown-skinned lady [[SeductiveMummy with a few bandages]] in strategic places, much like the ones in the online game and the subspecies cards in the anime.
* BlandNameProduct: ''Monsterbooks Coffee''.
* BleachedUnderpants: As noted in the description, most of the original Monster Girl works are far more explicit.
* BloodlessCarnage: In chapter 39, Zombina gets [[spoiler:torn in half by a Jiang-Shi FriendlyEnemy of hers]], and there's absolutely no blood, guts or gore around. Of course, the manga is primarily a light-hearted comedy; however, in Zombina's introductory chapter, she was shot multiple times and bled profusely.
* ABloodyMess: In chapter 6, Kimihito was at the fridge when the girls caught up and rammed into him. In the aftermath they saw him lying on the ground with the splattered ketchup thinking it was his blood.
* BoobsOfSteel:
** Tionishia sports the largest set, with Centorea and Rachnera somewhat behind, and she is the strongest. Being an Ogre / Oni helps as well.
** Centorea is no slouch in the strength department either, feeling perfectly at ease with full-plate armor. This is similarly justified by the racial gift of her strong centaur body.
** Rachnera is no weakling, but her superiority in combat is generally more along the "ambush and trap" variety.
** Cathyl is a Minotaur who is both taller and bustier than Tionishia, and is quite the powerhouse herself.
** And then of course, Suu and Kii take it UpToEleven [[spoiler: with their ability to reach {{Kaiju}} proportions (and the bust sizes to match)]]
* BreakingTheFourthWall: The color pages at the start of chapter 39 feature Doppel talking to the readers and showing them the other MON girls in their sleep. Since she's an EldritchAbomination of sorts, she managed to see beyond the manga pages!
* BreastExpansion: As part of Suu's shape changing abilities, if she consumes enough water she can change from the appearance of a young girl to a buxom adult.
* BrokeEpisode: In chapter 25, Kimihito finds out he doesn't have a lot of money leftover due to having to buy so much food to feed the girls with, and they're out of food. [[spoiler:Fortunately the vendors give them a lot of free food, mostly stuff they couldn't sell, and later Suu and Kimihito visit Kii, who gives them a lot of edible plants from the forest. Ms. Smith later tells him that the government would reimburse him for living expenses. He tells her she should have told him about this sooner. He then spends almost all of Chapter 26 OutOfFocus, having his various receipts and claims audited by the government. ]].
* BrutalHonesty: Rachnera generally does this as she doesn't like sugar-coating things. She's [[spoiler:happy when Centorea says she dislikes her, after pretending she didn't because it means she finally spoke her mind.]] Or when she [[spoiler:tells Centorea her sandwiches are not very good because she just put chopped raw vegetables between two pieces of bread.]]
* BullyingADragon:
** After being offered help by [[spoiler:[[SpiderPeople Rachnera]]]], the Director tells her that she has no right to be high and mighty when he's the one who can make money off of her [[spoiler:webbing, and that she should [[BeCarefulWhatYouWishFor keep it in one place, not all over the building]]. She proceeds to [[AndIMustScream encase him in webbing]].]]
** Later, Rachnera is taunted by [[spoiler:Lilith]], in an attempt to [[BreakingSpeech break her]]. See ShutUpHannibal.
** The leader of the orcs chases after Doppel, who was in the form of Lilith, with the intent of raping her. Kimihito distracts him before he can do so, and Doppel gets her revenge by transforming into a monstrous form and terrifying the orc into insanity.
* ButtMonkey: Draco becomes this after her first appearance.
* CallBack:
** In Chapter 26 in Cerea's room you can see the body armor and the saddle she has used in previous chapters.
** The chapter featuring Doppel has her turning into various girls, including a member of [=ANM48=], who weren't seen at all since chapter '''one'''.
* CanonImmigrant: At the beginning of Chapter 43 Miia [[http://imgbox.com/Qn899zTy is reading]] a fashion magazine for liminal girls. The featured models come from the online game, ''VideoGame/DailyLifeWithMonsterGirlOnline''. (To be more specific they are [[http://dailylifewithamonstergirl.wikia.com/wiki/Kalolo Kalolo]], [[http://dailylifewithamonstergirl.wikia.com/wiki/Bisque Bisque]], [[http://dailylifewithamonstergirl.wikia.com/wiki/Rus Rus]] and [[http://dailylifewithamonstergirl.wikia.com/wiki/Rohe Rohe]])
* CantHaveSexEver: Not without the monster girl being kicked out of the country, anyway. Note that [[ShownTheirWork real-life exchange programs]] usually have this policy. Subverted as of chapter 5, as Kimihito has been made into the guinea pig of a new amendment to the exchange program allowing interspecies marriages, presumably rendering the rule invalid. As the series progresses we see many other men and monster girls getting into clearly romantic relationships without a word about the no sex policy.
* CasualDangerDialogue: Happens from time to time, due to the often dangerous situations Kimihito is put in by the monster girls.
* ChekhovsGun:
** When Miia first meets Draco, Draco gives her a can of coffee as a gift. [[spoiler:After Kimihito saves her from Draco, she throws it at Draco to [[ShutUpHannibal shut her up.]]]]
** When Mero is introduced, there are times when she speaks with a high regal tone, with her being portrayed as a regal monarch. [[spoiler:Turns out, she is a princess for real]].
* Myth/ClassicalMythology: A lot of the girls are based on Greek myths: Miia (lamia), Papi (harpy), Centorea (centaur), Rachnera (arachne), Manako (cyclops), Kii (dryad), Cathyl (minotaur), Merino (faun), Ton & Kot (barometz).
* ColorCodedForYourConvenience: The main girls have consistently followed a color scheme with their hair, feathers, scales and the like, and is utilized in the anime opening.
** Miia: Red
** Papi: Blue
** Centorea: Yellow
** Suu: Green
** Meroune: Pink
** Rachnera: Light Purple
** Lala: White/Grey
* ColorFailure: Manako after hearing just how much larger Centorea's breasts are than her own.
* ConspicuousCG: The kissing fish in Episode 9 feel out of place among the other sea creatures.
* ContinuityCameo: Polt the Kobold, who has a much more prominent role in the manga, is shown running through the park in episode 10 of the anime.
* ContrivedCoincidence: Subverted. When the main characters are trying to root out a vampire at a monster convention, by an amazing coincidence there's a huge display of vampires' classic weaknesses that they conveniently use to test on the person they think is a vampire. But while at first it seems to serve no purpose other than to comically conveniently further the plot, some other monster girls explain that it's there so that the countless ''other'' blood-sucking monster breeds can easily demonstrate to the people they meet at the con that, despite sucking blood, they aren't vampires, a known, dangerous extra-species.
* CouldHaveAvoidedThisPlot: If Kimihito had mentioned [[spoiler:his financial troubles in feeding the household to Ms. Smith (or alternately, if she had remembered to tell him about the government reimbursing him for such in the first place, rather than at the end of the chapter after eating all his food)]], Chapter 25 wouldn't have happened. Kimihito is left even more frustrated when he realizes this at the end, and the gang end up [[spoiler:eating out all day the next day... [[NoodleIncident and getting thrown out a steakhouse]]]].
* CrackDefeat: In chapter 17, Miia and Meroune have a swimming race. Mero is expected to have the advantage, being a mermaid, but Miia uses her 8-meter body to simply stretch a long distance, allowing her to cover much of the pool without swimming. In the end, [[spoiler:both of their {{Logical Weakness}}es come into effect (to clarify, the heated pool isn't warm enough to keep Miia going and the chlorinated water poisons Mero), and Cerea wins despite not being shown for the entire race. Doubles as a BrickJoke, as Cerea actually ''does'' mention that she's going to participate in an earlier panel, but she's ignored despite her protests.]]
* CrapsaccharineWorld: The first chapter lays out a pretty optimistic view of the world, but also lays out subtle indications that things are not quite as happy as they seem. The exchange program's been a "huge success", ''various'' extraspecies have been able to integrate well with human society, and it didn't really change the world much. However, the exchange laws are explicitly noted to be full of loopholes:
** While either humans or extraspecies harming each other would punish one side or the other, this simply leads to people from both sides abusing the law to their own advantages while also being protected because they haven't ''technically'' harmed someone, and the legally permitted penalties are so absurdly negligible that the orc leader points out that all he'd get for what amounts to a terrorist attack is ''community service''.
** If an extraspecies is found away from their host, ''they'' are the one in violation of the laws, even if the reason for it is something like being sold off to someone else, with no mention of any penalties to the host for the separation. Heck, in Chapter 26 it is even revealed that the host family that sold them off '''can still be a host family for an extraspecies, even to said extraspecies they sold off.'''
** Young monster girls are also in danger of being kidnapped by humans, likely to be sold into any number of horrifying scenarios. The ones rescued in Chapter 20 are ''children''.
** While extraspecies along the lines of cat girls have integrated well, to the point of being celebrities in some cases, the "various" successes do not apparently include the more monstrous variants, such as most of the girls living with Kimihito. Racism toward them is shown repeatedly throughout the series.
** It's noted that most places are not built with non-humanoids in mind. Chapter 15 implies that Kimihito's home is one of the only places that is. Justified because the other species were unknown to most of humanity. In chapter 17 it was shown that attempts at integration are being made. Not a road without speed-bumps, though, since there are lots of different species, each one with different needs. The equipment in the gym that was set up for extra-species, for example, was full of human equipment unsuitable for those without legs similar in size and shape to a human.
** The chapter introducing Miia's mom has introduced a bright spot in this darkness. [[spoiler:In the TheUnmasquedWorld, the lamia can procreate with much more ease, since with the access to human society, they can also have access to human sperm banks and can procreate by artificial insemination. Note though this option is never mentioned, perhaps because lamia prefer actually mating with a man, pleasure seeming to be their aim as much as procreation.]]
** Chapter 36 has put a dark twist to the mermaid society. [[spoiler: Because of their love of tragic love stories, many mermaids have eloped with humans. Because of this, the overall human-mermaid relationship is a bit fragile]]. Chapter 37 [[spoiler:reveals the elopement problem isn't nearly as bad as it seems. Meroune's mother having exaggerated the scope of it as part of her plan to create tragedy]].
** There's also the issue of if a host has any type of sex with their hosted nonhuman, ''even if the nonhuman started it, whether or not it was voluntary'', they'll be sent to jail, while the nonhuman in question will only get deported. Albeit the government seems to have given up on the "no sex" rule as the series has progressed.
** Humans don't have it exactly easy, either. For starters, almost all the girls are ''way'' stronger than normal people (though many have various weaknesses humans don't). Anyone can become [[ZombieApocalypse the living dead]], and some of these undead have access to some pretty lethal weaponry. The sea is home to a kingdom led by an extremely rich and powerful [[spoiler: (not to mention ''dangerously unstable'')]] queen that can remodel a normal house without anyone noticing, so who knows what will happen if her beloved daughter ever gets in danger? There are sentient moving treefolk that are shown to take [[GaiasVengeance drastic measures against pollution]] (albeit said dryad was not in her right mind at the time). While the only liminal terrorist group shown is pretty goofy, the mere fact they exist is a quite worrying situation. Shapeshifters and [[EldritchAbomination creatures outside comprehension]] are known to exist, so hope they never turn bad (though mitigated by the on we have met admitting she is not much stronger than a human). Finally, apparently there are [[DevilButNoGod demonic girls, but not angelic girls (again mitigated by how little they have to do with mythological demons).]]
* CrashIntoHello:
** How Kimihito first meets Centorea, where they even lampshade it.
** His meeting with Meroune also goes something like this. Kimihito plucks her from her runaway wheelchair and ends up smashed between her and a pole during their first encounter.
* CrazyPrepared: Yukio's onsen has something for just about every type of extraspecies. They have extra-long pools so Miia can ''really'' stretch out, extra-deep pools so Centorea can completely submerge herself, and shallow waterfall pools so Suu can still enjoy the water without being diluted. Yukio herself typically wears a '''huge''' sealed full-body suit when walking around the hot springs area, to protect her ice-cold body from the ambient high heat.
* CreatorCameo:
** A variation: Okayado's AuthorAvatar, a hermit crab with pen tips for claws so he can draw, appears in several panels of the manga, and makes multiple appearances throughout the anime.
** Okayado himself appears in Episode 7 of the anime as someone named Okayada. However, not only is his character not seen, he's barely audible due to other characters talking over him.
* CuteMonsterGirl: It's in the name, folks.
* {{Cyclops}}: Manako was initially called a cyclops, but was later reclassified as a monoeye in the anime. Episode 7's [=MonMusu=] Collection shows the monoeye's sub-species, such as the cyclops, who are bigger, bustier, and expert blacksmiths, making them the envy of other monoeyes; the one-eyed monks [[note]][[{{Youkai}} Hitotsume-nyuudou]][[/note]], who are actually regular monoeyes that have converted to Buddhism, and are stern both with themselves and others; and the [[Manga/GeGeGeNoKitaro backbeards]], who look like children and have an assortment of eye powers like hypnosis, inflicting blindness, and EyeBeams.
* DamnedByFaintPraise: Centorea is shocked when [[InnocentlyInsensitive Ren]] says that her room smells like a barn. When she asks Miia for confirmation, she simply says that she's gotten used to it.
* [[DarkHorseVictory Dark]] [[JustForPun Half-Horse]] [[DarkHorseVictory Victory]]: Miia challenges Meroune to a swimming competition in Polt's gym. They are able to go head-to-head, [[spoiler:at least until Miia starts to feel ill because of the cold, and Mero almost faints because of the chlorinated water. The winner is... Centorea, who until that moment hadn't even been seen in the panels!]]
* DatePeepers: Chapter 18 has the girls tail Kimihito and Ms. Smith, spying on their date together. [[spoiler:Turns out it's a cover to flush out an assassin out for Kimihito's life should he marry a monster girl.]]
* ADayInTheLimelight: Chapters 38 through 42 are dedicated each to a different girl, in order: Lala, Zombina, Doppel, Tionisha and Manako. Lala's chapter sets up the following by making it so MON gets a forced vacation and Kimihito has to go on a date with each one of the girls.
* DebutQueue: Each of the girls gets a chapter that introduces them. Including the MON, who are a police force consisting of non-humans who take out non-humans criminals trying to exploit the rule that humans can't touch non-humans.
* {{Deconstruction}}: Of the CuteMonsterGirl: rather than taking the fantastic creatures at face value, the comic puts a good deal of time and effort into delving into the complexities of their anatomy and how they would interact with the world around them: Mero the mermaid for instance must avoid chlorinated water, as trying to breathe in it is like inhaling bleach fumes and will make her horribly sick. Miia, being part snake, has an aversion to cold. Manako the cyclops has horrible depth perception, and so on. These usually [[HilarityEnsues end in humor]] but also lead to a couple of tense moments, like the time [[spoiler:Miia nearly drowns in a pool when the cold water saps her strength.]]
* DCupDistress: Centorea's breasts are so big that they make it hard to hold her lance correctly when jousting.
* DefeatByModesty: Centorea's jousting match with her mother [[spoiler: ends in a draw because they both suffer a WardrobeMalfunction.]]
* DepartmentOfRedundancyDepartment: Ms. Smith is surprised at how casually [[ClingyJealousGirl Miia]] accepts Papi as a second guest, to which Miia responds, in three different ways, that Papi is just a child (she's actually Miia's age).
* DepthDeception: In chapter 24, the latest threat to Kimihito's life is a truck barreling down the street. It's shown in extreme closeup for two panels, one of them the standard "Corner of a vehicle speeds into frame before a collision." [[spoiler: It's a remote-controlled toy that comes up to his knee. Getting hit by such a thing would be unpleasant, but hardly fatal.]]
* DestructoNookie: All of the girls during the {{Lunacy}}. Kimihito even admits he first has to train his body like mad to even stand a chance of surviving the wedding night with whomever he picks.
* DidntThinkThisThrough: [[spoiler: Lala]] visits Kimihito in the hospital alone to avoid all the girls trying to fit in one room. Pretty good thinking until Kimihito realizes a girl with [[spoiler:a detachable head, that claims to be the Grim Reaper,]] might (and does) cause a scene.
* DiplomaticImpunity: As the police are not allowed to arrest monsters for fear of a diplomatic incident, a group of Orcs attempt to invoke this in order to hold up a doujin store. Unfortunately for them, there IS a task force meant for just such a situation in the form of MON.
* DirtyKid: The young boys who usually play with Papi.
* DisproportionateRetribution: Kimihito is at times subjected to this by the monster girls, but usually the injuries he suffers are accidental.
* DoItYourselfThemeTune: The opening and ending are sung by the girls' voice actresses (the former by the girls at Kimihito's house, the latter by MON's girls).
* DoesThisRemindYouOfAnything: When [[VideoGame/{{Touhou}} Suu and Papi cosplay as Utsuho]], with Suu controlling the hands and feet, the others attempt to call them. Suu ends up fumbling with the phone and drops it between her breasts, with all of this happening in public. The phone goes ''all the way down'' and then they attempt to call her again. With the phone on vibrate. [[MaleGaze The people watching from afar would have their noses bleeding by this point]]. The anime makes it even ''worse'', as Suu's efforts to recover the phone make it look like Papi is [[ADateWithRosiePalms pleasuring herself]].[[note]]If you read this like a {{doujinshi}}, then you're right on track, since it is common for the series.[[/note]]
** At the extra-species convention, Polt demonstrates the use of an exercise machine to simulate riding a centaur. However, the way she was doing it and her reactions make it look like she's doing the cowgirl position for... something else...
** At the same convention, the 'Exchange Program Matching Party' where extra species can meet with potential hosts, looks for all the world like a dating service. The hallways are full of human males and female extra species hooking up and openly flirting with each other as they enter soundproof, unmonitored rooms with just a couch, pillows and a blanket in the back, where the hosts can conduct 'private interviews' with the extra species ladies (that day was focused solely on female monsters looking for male hosts). They can even leave forms on their doors detailing their 'preferences' as to what kind of monstergirls they would like to 'interview'
* DoubleStandardAbuseFemaleOnMale: Largely averted. While Kimihito does take the majority of abuse, most of it is accidental and the girls tend to be apologetic afterwards.
* DoubleStandardRapeFemaleOnFemale:
** Suu does not understand the implications of what she does to the other girls when she engulfs them, but if they get even the slightest drop of water -- or body fluids -- on them, she will happily violate them with her amorphous body and tentacles. This is played for laughs and even her victims treat it as nothing but a minor annoyance, telling Rachnera that she'll just have to get used to it.
** It's impossible to disguise the fact that Rachnera is basically a lesbian rapist. The fact that her assaults involve a lot of [[UsefulNotes/{{BDSM}} bondage with Rachnera acting like a dominatrix]] is used to [[PlayedForLaughs play them for laughs]] but what she did to Lilith the devil was ''unmistakably'' sexual assault. Course this is mitigated by how she did it (at least partly) to find out if Lilith was the one threatening Kimihito's life (she had observed the devil was toying with Cerea's mind), and Lilith turns out to be a hardcore masochist and becomes obsessed with Rachnera.
** Soundly averted in the case of [[spoiler:Draco]], whose molestation and attempted rape of Miia is in no capacity portrayed as anything other than a bad thing.
* DoubleStandardRapeFemaleOnMale:
** If any of the girls raped Kimihito, ''he'd'' be the one sent to jail while the offending girl would only be deported! Considering how much stronger they are than him (and how horny they can get), it's really impressive that he's managed to fend them off as long as he has! [[spoiler:Admittedly, he is eventually selected as a test case for interspecies marriage, meaning that if it does happen, neither of them will be punished, but that would be poor consolation to a rape victim.]]
** Chapter 27 might as well be called DoubleStandardRapeFemaleOnMale as we learned that lamias have been reproducing by kidnapping and imprisoning men to use as [[SexSlave fodder for breeding]] and played for laughs. This came to an end when the extra-species laws came into effect, forbidding them from doing so anymore. Though that hasn't stopped them with the idea that the lamias that attend the exchange bring back their host. On the topic of Chapter 27, Miia's mother fondles Kimihito's junk twice and subjects him to a poison that forces the victim to become lustful toward Lamias proportionately to their repulsion toward the race (i.e. the less a man wants to have any involvement with Lamias, the more potent it becomes).
* DraconicHumanoid: Dragonewts resemble Western dragons, complete with wings and tail, though [[WingsDoNothing they can't fly]]. Episode 10's [=MonMusu=] Collection also covers their subspecies, which include Ryu-jin (a long-lived wingless type who resemble Eastern dragons rather than Western dragons) and wyverns (an aggressive, none-too-bright type who can fly).
* DrunkOnMilk: Rachnera gets drunk on caffeine (from tea and coffee); this is actually achievable [[ShownTheirWork in spiders]].
* DubNameChange: The English dub of the anime uses the term "demihuman" instead of "liminal" for referencing monster races.

[[folder:Tropes E to I]]
* {{Ecchi}}: There is topless nudity and lots of {{fanservice}}, but nothing more racy than that. This varies sometimes. Even compared to the bold previous chapters, chapter 20 is unbelievably raunchy when you see it for yourself. [[UpToEleven And then there's chapter 21.]] For anime only viewers, see episode 10. Yow. Yet even that pales in comparison to Chapter 36. Don't read that with anyone else in the room.
* ElephantInTheLivingRoom: In the Extraspecies convention, Kimihito and Miia check out a room built for those with reptilian attributes. Inside waiting was [[PsychoLesbian Draco]], who declares that this would be an ideal living space for her and Miia while going on about her imagined future together. Miia and Kimihito were instead focusing on a lamia tail warmer before leaving, completely ignoring Draco, much to her shock and despair.
* EmergencyTransformation: [[spoiler:Lala turns Yuuhi into a zombie with Zombina's tooth so she can come back and continue living after she dies.]]
* EroticEating: [[HarpingOnAboutHarpies Papi]] can't hold a popsicle on her own without the risk of dropping it, so she asks Kimihito to do it for her. Passersby conclude that [[AccidentalPervert he's a pervert who is doing it on purpose]].
* EvolvingCredits: The final episode's credits sequence adds Lala to the final shot of the harem cuddling Kimihito in bed. Kimihito's expression also changes from [[BlankWhiteEyes stunned]] to serene, showing how he's grown used to having the girls around.
* ExactWords: The Volume 6 color page story has Rachnera testing out various bondage poses on an unwilling Miia and Centorea (she also did it to Mero, [[TooKinkyToTorture but she wasn't exactly "unwilling" about it...]]). When Miia demands that she "stop doing this kind of stuff all the time", Rachnera agrees that doing the same thing over and over gets dull... so she ties up Miia in a new pose.
* FantasticArousal:
** Suu does this to Centorea, Miia, and Papi in chapter 10 while trying to get water/sweat off them. Anytime that Suu gets a chance to wrap herself around any of the monster girls, she tends to end up [[BlackComedyRape getting a little too touchy]].
** On a more general note, the tip of a lamia's tail. Dragonewts are just as sensitive there.
* FantasticRacism:
** Towards the monster girls. And if they retaliate, they get kicked out of the country. Though in fairness, it goes both ways.
** Draco believes that the Dragonewts are superior to everything else on the planet and thus kings of not only reptiles, but all species.
* FantasyCounterpartCulture: According to the chapters where the girls' mothers come to visit them, lamias live in a [[ArabianNightsDays pseudo-Arabic]] country (Miia's mom is dressed more or less as a belly dancer). Harpies live in villages similar to [[BraidsBeadsAndBuckskins Native American]] ones. Centaur society is not really documented but it most likely is an approximation of Medieval Europe.
* FastballSpecial: When an orc manages to capture Doppel, who's disguised as Lilith, Kimihito distracts him by throwing the actual Lilith, who's tied up in bondage, into the back of his head.
* FeeFiFauxPas: Played with when the majority of the crew tour a shopping mall for the first time, since the usual supermarket is closed: street vendors go into a panic as they try to hide or at least stop cooking chicken, fish, and even horse as the mermaid, harpy, and centaur come into view. Kimihito hastily contradicts the assumption, at least for the non-vegetarians. Also leads to an associated conversation held by Kimihito to his harem about possible food clashes.
* FishOutOfWater: The world (extra-species and humans) is experiencing this thanks to the fantastic CultureClash. It is particularly harder for non-humanoid species in human cities (justified because humans have never experienced having centaurs, mermaids and arachnes as fellow citizens, so the cities aren't adapted (yet) to them).
* FoodPorn: Later chapters feature entire full-page panels devoted to showing off mouthwatering food.
* {{Foreshadowing}}: The author's note in Chapter 8 regarding Suu's appearance says that some of the other most requested monster-girls were a spider girl, a dullahan, a mermaid, a plant girl, and a dragon girl. All of which end up appearing later in the manga.
** The anime does this a lot, to the point that it sometimes gets into LateArrivalSpoiler territory for people who haven't read the manga.
* ForgetfulJones: Harpies as a whole have terrible memories. Papi can't even remember Kimihito's name, only calling him 'hubby'. Eventually, he realizes [[spoiler:her memories are forgotten after her third step or so, and has her stop walking to explain more about the situation]].
* FreezeFrameBonus: At the end of every episode in the anime, a set of descriptions for subspecies of creatures representing the main heroines is displayed. However, it's only up for a few moments, necessitating pausing if one wants to read their descriptions.
** In Episode 11, when Polt is shown running past Manako, [[spoiler: D can actually be seen in the background]].
** Episode 12 has a few of them, for example the silhouette of [[Manga/NamiuchigiwaNoMuromisan Muromi]] hidden in the splashes when Kimihito floats down the river, and also, in the shopping district sequence, a sign reading NIKI KETTEI.[[note]]Meaning more or less "Second Phase Confirmed", possibly alluding to a second season in the works.[[/note]]
* FriendsRentControl: Justified; all expenses needed to house the many people that live with Kimihito are paid for by the government as part of the exchange program. The associated rising food expenses versus a constant income, on the other hand, comes to a head in Chapter 25... [[spoiler:by the end of the chapter, it continues to be played straight.]]
* FullBoarAction: A wild boar appears out of nowhere in Chapter 21.
* FunbagAirbag: A pretty literal case when Kimihito meets Mero. He catches her before she can crash into a telephone pole, with her breasts cushioning the impact to his face.
* FunnyBackgroundEvent: (Episode 4) While Miia, Centorea and Kimihito discuss what to do with Suu, she already plays TV console tennis with Papi.
* GagBoobs:
** Miia and Centorea. Gets [[LampshadeHanging lampshaded]] where both call each other on their bust size.
** Outclassing either of them is the Ogre Tionishia (who is said to have a 160cm breast size) and Cathyl, a Minotaur who leaves all three in the dust.
* {{Gainaxing}}: Centorea. Her breasts bounce a lot thanks to their size and her lack of a bra. This actually turns out to be a problem in Chapter 29, as the bouncing keeps throwing off her aim while jousting.
* GenreSavvy:
** The CrashIntoHello above? Centorea believes all stories in Japan have their true love met this way, particularly if they are eating a piece of toast. This is a common staple in anime.
** In chapter 43, Ms. Smith warns Centorea to keep an eye on Kimihito because three dangerous extra-species individuals just entered the country illegally. When Centorea asks her why they would target him, Smith outright says there's ''no reason at all'' to think they will. It's just that Kimihito is just such a WeirdnessMagnet that they may as well take some precautions this time around for a change.
* GentleGiant: Tionisha, but also all the ogre subspecies according to ep. 9's end card. Despite their size and strength, they're very laid back and not aggressive. Taken UpToEleven with the Gigantes: 10 mt./30+ ft. girls ashamed of their nudity (almost nothing fits them) and so afraid of hurting someone by accident that they'll stand still for hours. Awwwww.
* GettingCrapPastTheRadar: Arguably the whole series, but some Stealth Crap should be mentioned: The cut screen in the mid of Ep. 4 looks like Suu "unbirthing" Kimihito. (But since she's a Slime...)
* GivingUpTheGhost: More than one victim of Miia's cooking, as well as Miia herself when she finally comes across Lala's head and later watches Lala drink tea (read: pull off her head and pour the tea down her neck).
* GodivaHair: Frequently in the anime, so it can avoid showing [[NippleAndDimed anything that's fine in manga form and not-so-fine on television]]. Also the only form of covering doppelgangers wear since they use it to transform.
* {{Gonk}}: Male Centaurs are so ugly and brutish that the only way many of the females will ever mate with them is if they are put in the mood by a handsome human male. Much in the same way 'teasers' are used when breeding racehorses.
* GratuitousEnglish: The English subtitle below the series' kanji says ''"Everyday that there is a monster girls."''
* HalfHumanHybrid: Due to the monogendered nature of their respective species, Miia and Papi are this, having an inverse of the HumanMomNonHumanDad subtrope; [[spoiler: Chapter 29 reveals that Cerea also falls under this.]]
* HannibalLecture: Lilith, [[spoiler:bound to a tree by Rachnera,]] tries this on her by calling her basically a frightened little girl hiding behind her tough outer shell. [[SubvertedTrope Not only does it not take,]] but it [[BlackComedyRape mostly just serves to make it that much worse for herself]]. [[DoubleSubversion Then again]], the fact that she reacted like that does opens up the possibility that Lilith may have struck a nerve.
* HappyEndingMassage: The eel mermaid masseuses in Chapter 35 go straight for their clients' erogenous zones and don't let up, for a PG-13 version.
* HarpingOnAboutHarpies: Papi and her mother. Episode 2's [=MonMusu=] Collection also covers several harpy subspecies, such as land animals, the harpy version of birds such as emus and ostriches, adapted for terrestrial life; poultry, the harpy version of chickens; and raptors, the harpy version of eagles and hawks.
* HeIsNotMyBoyfriend: When Meroune innocently asks Centorea if she's dating Kimihito in chapter 12, the latter replies this way. Not that they'd mind being his girlfriend/wife though.
* HeadbuttThermometer: Centorea demonstrates this to Suu, who then performs this on Kimihito. It doesn't quite work as well as Centorea intended, mostly because Suu almost drowns Kimihito and just repeats what Centorea said--that is, ''her'' body temperature.
* HeadlessHorseman: A female Dullahan named Lala shows up, minus her steed.
* HeartBeatDown: The ending of the anime opening credits has all the girls combine this into one giant attack and throw it at Kimihito.
* HeroicSacrifice: Subverted. Kimihito takes the hit when the purse snatcher tries to slash Centorea with her sword. Luckily it's just a (very sharp)fake. While Centorea knew it, Kimihito did not, making his attempted sacrifice completely genuine.
** [[spoiler:Meroune injures her tail when she saves Kimihito from the traps in her mother's throne room.]] Luckily she's able to make a full recovery.
* HiddenPurposeTest: In Chapter 29, [[spoiler: it turns out Centorea's mother challenged her to a duel not because she disapproved of Centorea's relationship with Kimihito, but to prove that the centaur race's old custom of only breeding with the strongest centaurs was outdated, since Centorea's father was a human.]]
* HighCollarOfDoom: "Cobra Miia" had one resembling a cobra's hood.
* HoistByHerOwnPetard: Happens to Miia twice in chapter 12:
** The first time, she notices Meroune's clothing keeps slipping off due to a mermaid's natural sliminess. So Miia plays with Suu to get slimed up too, but Kimihito just tells her to take a bath.
** The second time she turns down the temperature to make Meroune feel cold, despite the fact that Miia herself doesn't like the cold. Then Mero mentions that compared to the temperatures in the deep parts of the ocean, the AC feels nice to her.
* HornyDevils: Chapter 21 introduces Lilith. She has a young-looking body like Papi, can hypnotize people, and really enjoys watching sexual acts.
* HostileShowTakeover: {{Downplayed}}. In the Anime episode that introduced MON, the ending theme(focused on MON) is played as the opening theme with the regular opening theme(focused on the main cast) serving as the ending theme.
* HouseFey: The Cultural Exchange Between Species Bill lets people have monster girls living with them as au pairs. The closest thing to fairies in this setting would be kobolds or dryads.
* HowWeGotHere: Chapter 6(episode 3 of the anime) starts with Miia, Papi, and Centorea, fighting over Kimihito, each saying they'll be the one he marries. It goes back to earlier that day to show how this happened: Ms. Smith's announcement that Kimihito must marry one of them, and the effects of the full moon causing them to lose control of themselves.
* HumanSubspecies: Both the politically correct, and actual classification of the "monsters" of the series. For the most part they act like humans with physical quirks; [[spoiler:in fact, humans and some extra-species have always reproduced together]] and the zombie extra-species is, in fact, composed of [[OurZombiesAreDifferent actual former humans anyway]].
* HurricaneOfPuns: The first volume of the English manga has ''so many'' animal puns. While present in the second volume as well the amount of puns seem to have been drastically reduced.
* HypocriticalHumor:
** In chapter 2, Miia yanks Kimihito into a dressing room to show off some bras, which he is clearly uncomfortable being in. He rushes out after seeing her topless, and accidentally yanks her panties away, which seem to be a thin triangular shaped piece of clothing. She then says only a pervert would steal a girl's panties, while completely ignoring the fact that she constantly teases him and goes topless around him, putting him in those perverted situations against his will.
** In Chapter 19, Miia is indignant when Mero introduces her to a sea snake, believing she's doing so just because Miia's a snake. This despite Miia making fun of the other girls by comparing them to sea animals.
** Miia, Mero, and Rachnera say they thought [[spoiler: Dullahans]] were made up. They're not ones to judge, being a snake-lady, mermaid, and spider-woman respectively. As Kimihito points out.
* IdiosyncraticEpisodeNaming: Every episode of the anime is titled thus: ''Species'' [number] - ''Daily Life With'' [plot description].
* ImagineSpotting: Kimihito in particular is prone to this.
** In episode 2, Kimihito notes that Miia's image of him looks nothing like him.
** In episode 3, Centorea talks about the proud centaur race and behind her a group of armored centaurs are visualized. Kimihito asks "Are those [[Manga/JojosBizarreAdventure Stands]], or what?".
** In episode 6, Kimihito comments that Miia's NakedApron fantasy has nothing to do with cooking.
** In the final episode, Centorea tastes some carrots and extols their virtues during a DisneyAcidSequence. Miia, who is not even near her, points out that her poor taste buds are only ''one'' of the reasons behind her terrible cooking. Behind her, Rachnera wonders who she's talking to.
* ImmodestOrgasm:
** The first is before you're even ''ten pages'' into the story, too (or 3 minutes into the Anime).
** A RunningGag is that [[SlimeGirl Suu]] is often prone to causing the other girls to have them whenever she gets thirsty.
* ImprobableFoodBudget: Averted in chapter 25. With Lala's addition to the group, Kimihito discovers that he can't afford to feed everyone. [[spoiler:Later played straight and justified, as food expenses are also paid for by the government.]]
* ImprobablyFemaleCast: Aside from the Orcs in Chapter 11, the male centaurs in Chapter 29 (in a flashback), Sebasstian and Flounnder in Chapter 34 and Kyurii's father in chapter 50, every single Extraspecies seen has been female. That said, Lamias and Harpies at least are a OneGenderRace.
* ImADoctorNotAPlaceholder: Centorea's response to Mero's suggestion that she help carry a large quantity of groceries: "I'm a knight, not a packhorse." Her response to Kimihito asking her to do it? "As you command, milord!" and strapping everything to her back.
* ImTakingHerHomeWithMe:
** In chapter 19, [[GentleGiant Tionishia]] mistook "touching the dolphin" with "abducting it from the pool".
** In Chapter 33, Papi and others help on a farm and she absolutely falls for the baby chickens to the point she won't leave the farm without them.
* InSeriesNickname: Kimihito is rarely called his real name, as each of the girls have their own [[AffectionateNickName nickname]] for him.
* InstantSedation:
** Played with when Ms. Smith uses darts meant for Extraspecies. So when Kimihito was hit with three of them she was glad to see that he was still fine.
** Straighter example in Chapter 27 with lamias' neurotoxin. Can be taken orally. Several hours of sleep with no risk of overdose and hardly any ill effects. Or maybe the one administering it doesn't care about others' well-being. [[spoiler:Rachnee later pays her back for the hangover.]]
* InterruptedIntimacy: If it ever looks like one of the girls is about to do it with Kimihito, you can count on another one showing up to stop them.
* IntimateHealing: In Chapter 13, many of the ladies' suggestions to help Kimihito get over his cold tend to degrade towards this. In the end, what actually works is another example: [[spoiler:Suu gives him filtered water out of her body, by ''breastfeeding him''.]]
* IronicEchoCut: In Chapter 40, [[spoiler:Doppel unleashes what's implied to be her true form on the Orc Leader. Immediately following is a cut to Liz and Kinu playing the ''Call of Cthulhu'' tabletop RPG and coincidentally summarizing the events that had just occurred.]]
* IWantGrandkids: Miia's mother. Also applies to the ''entire lamia race''; lamias require human men to be able to reproduce, so they are often forced to kidnap men and press them into becoming the father of the next generation of lamia. The Extraspecies Exchange Act stopped this kidnapping, so each Lamia tribe sent out a representative to find (and seduce) a man so he would come willingly. [[spoiler: Miia is the representative of her tribe.]]

[[folder:Tropes J to P]]
* JustAKid: Papi and Suu are treated more like Kimihito's little sisters than romantic rivals by the other girls in the household. Rachnera even volunteers to "babysit" them when Miia, Meroune, and Centorea visit a gym built specifically for extraspecies like them.
* KarmaHoudini: Despite the fact that the law is very clear about sexual intercourse in the host home, Miia and the others all routinely make passes at or otherwise force themselves onto Kimihito. He is always the one taking all the heat and being constantly reminded and threatened about the consequences, and yet the girls are never reprimanded for THEIR behavior or told to have any sort of self-control.
** Smith repeatedly shirks her duties and responsibilities making life harder for Kimihito, with no punishment. Bringing Miia to live with him by accident, dumping more exchange students on him without consent, and [[spoiler:turning him into a guinea pig for inter-species marriage]]. Her only comeuppance being that she's overworked and under paid.
** Lilith the devil never changes her mischievous ways and every time she's about to get in serious trouble (being chased by a wild boar and about to be molested by an orc) Kimihito saves her. Then she just disappears until next time. The only time she was actually punished, by Rachnera, it turns out she was TooKinkyToTorture and actually ''enjoyed'' it.
* KnightOfCerebus: There are frequently "arc villains" so to speak who suddenly appear to represent the darker side of a sudden monster-human warming in relations. This is always ultimately subverted, however, as they inevitably reveal quirks that destroy their credibility, suffer a HumiliationConga, or join the harem's antics the chapter just after, with everything forgotten and wiping off the CerebusSyndrome along the way. These are not mutually exclusive.
** The Orcs seem to be this in chapter 11, despite being quite a bit sillier than most examples, but that chapter turns out to be an OutOfGenreExperience.
** [[SpiderPeople Rachnera]] served as a slightly straighter example. Not only is she more monstrous than most of the other girls, she quickly and easily [[spoiler:ties up the [[VillainOfTheWeek chapter's antagonist]] in a single panel. And her backstory, revealed in the next chapter, depicts a darker side to the exchange program: her host family illegally sold her to the director simply because they were expecting a more humanoid extraspecies, such as the cat girls that the media tends to focus on (although the truth proved to be not quite that simple: they honestly thought the director was part of the exchange program, and sold Rachnera off because she accidently injured her daughter). However, looks were deceiving: Rachnee's far from evil, more bitter than anything, and she ends that very chapter with joining the group.]]
** A straighter example is [[spoiler:the [[OurDragonsAreDifferent dragonet, Draco.]] Not only is she a fearsome sight, but she has the sheer, high-octane crazy to back it up, kidnapping and almost ''[[RapeIsASpecialKindOfEvil raping Miia]]''. Unlike Rachnera, she has no FreudianExcuse for her actions, and unlike the orcs she's competent and played deadly serious.]]
** [[spoiler:The Dullahan, Lala, makes her first appearance [[CliffHanger grabbing Kimihito by the notch in her scythe]]. Like Rachnera, however, she ultimately turned out to be (relatively) harmless: she plays up the 'doom and gloom' angle because she enjoys [[MrImagination playing pretend]], and just like Rachnera she joined the group when all was said and done.]] [[spoiler:Except her [[HiddenInPlainSight chuuni act covers up]] [[GrimReaper her control over death.]]]]
** Octo the scylla is [[spoiler:initially portrayed as a manipulative sea witch, responsible for human-mermaid elopement becoming a growing problem in mermaid society, even going so far as to kidnap Meroune. Then it turns out Octo wanted a chance to talk with Mero alone, in the hope that she could put a stop to the rumors about her, and Mero came willingly. Octo's not responsible for the growing rate of elopement (which is all down to the mermaids themselves), doesn't have any supernatural powers, and just wants to be left alone.]]
** Perhaps the scariest example so far is [[spoiler: Mero's own mother, queen of the mermaid kingdom. She personally instigates and spreads evil rumors about Octo, and also blows the mermaid-human elopement problem way out of proportion, in order to create a huge political upheaval that would result in the re-segregation of humans and extraspecies races. Why? Because it would be so ''tragic''. She's also revealed to have been cheating on the mermaid king (Mero's father) with a human boyfriend, and said schism between humans and extraspecies would separate the two of them, adding more to the ''tragedy''. And to top it off, she nearly drowns Kimihito and almost kills Mero, her own daughter in the process when she loses control of the various death traps she had set up. She's the villain that comes the closest to causing harm on a very large scale and multiple major character deaths in the series. Of course, as per usual, as soon as she is foiled, all is fixed and forgiven, and the status quo is mostly maintained.]]
** The Colossal Slime in Chapter 54 & 55 provides the straightest example yet. She's a {{Kaiju}} of a slime whose only goal is to absorb Suu in order to gain access to all the knowledge and memories the latter has accumulated while living with Kimihito, a process that would effectively kill Suu as an individual. She's not played for laughs or titillation at all, and even after being defeated she nearly kills Kimihito and Suu.
* LatexPerfection: Suu's shapeshifting abilities come in ''very'' handy, able to form perfect human legs for Meroune's disguise and perfect human arms for Papi's disguise. Unfortunately, said legs and arms are under the sole control of Suu, who can be scatterbrained at the best of times.
* LecherousLicking: Miia does this to Kimihito under {{Lunacy}}, as does her mother when she decides to take Kimihito for herself. It helps that Lamias have {{Overly Long Tongue}}s. Suu also occasionally does this to any girl covered in liquid.
* LethalChef: Anything Miia cooks is almost certain to make you sick or even pass out from just the smell. At first it was thought to be due to her just being a horrible cook, adding ingredients to the food simply because they have the same color or adding different ingredients because they have similar sounding names. But then it's also revealed that since she's a carnivore, she has fewer taste buds and can not judge her own cooking.
** Taken UpToEleven in the anime, due to SequenceBreak. In the Manga, Miia's first culinary nightmare occurred before Suu was introduced (in fact, Suu first entered the house because she was attracted to the smell of Miia's cooking). In the anime, Miia's first LethalChef attempt occurs after both Suu and Meroune had been added to the household, so Suu was shown being affected by it (normally she's the only one who can eat it without any side effects, due to being an ExtremeOmnivore). Albeit it may simply be that Suu was playing along and mimicking the actually sick girls, since the "soul" coming out of her is solid unlike theirs and is also smiling.
* LimitedWardrobe: Justified in that many of the girls need specially modified clothing to be able to wear them properly. (Meroune's skin is constantly coated in a slippery film, Papi has large, feathery wings instead of arms, Suu can only wear waterproof items such as a raincoat, etc.) For Smith, it's because she needs to wear her work uniform and is too lazy to wear anything else than a tanktop and panties at home. The trope is averted by the most fashion-conscious girls (Tio, Manako and especially Miia).
* LittleBitBeastly:
** All the girls shown during the 1st chapter, where the news reporter states that the program was a "huge success" and that the world hasn't changed much from it. It explains quite a lot about what happens to our poor protagonists, who don't fit into this category in the slightest.
** We actually get to meet an extraspecies girl who fits this category for the very first time in chapter 17: a Kobold (dog-girl), and a rather [[GenkiGirl genki]] one at that. Since then, more and more have been showing up: dragonets, dryads, and devils all fit this category, culminating in a [[HeadlessHorseman dullahan:]] just going by the manga, you'd never know she's not human until her head comes off or you get a look at her [[BlackEyesOfCrazy eyes]] (in full color, however, her skin's an obvious giveaway).
** And after them, we get [[AnIcePerson yuki-onna]], [[{{Kitsune}} nine-tailed foxes]], a minotaur, a faun, barometz, and lizardfolk.
* LittlestCancerPatient: Shows up, and is dealt with in the story's normal off-the-wall manner. [[spoiler:Lala 'cures' her with one of Zombina's stolen teeth, killing her and turning her into one of the undead. It works out fairly well, all things considered (she certainly doesn't have to worry about terminal diseases any more), but is a bureaucratic nightmare.]]
* ALizardNamedLiz: The names for most of the Monster Girls are all indicators of their species.
** Each of the {{Cute Monster Girl}}s in Kimihito's harem has her name derived from her species name -- Miia[[note]]romaji: ''Miia''[[/note]] from ''La'''''''mia''''', Papi from ''harpy''[[note]]"Harpy" is ''haapii'' (ハーピー) in Japanese romaji, and adding a dakuten to ハ (ha) makes it パ (pa).[[/note]], '''Centor'''ea from ''Centaur'', Suu from ''Slime''[[note]]romaji: '''''su'''raimu''[[/note]], Meroune from ''Mermaid''[[note]]Her last name, Lorelei, also refers to a famous siren from German folklore[[/note]], Rachnera from ''Arachne'', and Lala from ''Dul'''la'''han''.
** It isn't limited to the main cast either, see also: Zombina the [[OurZombiesAreDifferent zombie]], Doppel the {{doppelganger}}, Draco the [[DraconicHumanoid dragonet]], Yukio the [[AnIcePerson yuki onna]] and Liz the [[LizardFolk lizardwoman]].
** Even Ms. Smith qualifies, her given name is Kuroko (kuro meaning black and ko being a feminine suffix) and she is a female MIB.
* LoadsAndLoadsOfCharacters: New monster girls are introduced pretty much every chapter, so the cast quickly becomes pretty crowded. Though most of these characters don't have more than a couple of chapters of screentime.
* LoopholeAbuse:
** The Interspecies Protection Act has a few, namely, the "Humans can't attack monsters" and vice-versa law, which can be exploited by criminal monsters.
** When Miia gets insulted a second time by the racist couple in chapter 2, she remembers that she can't attack humans. However, that doesn't stop Kimihito from punching both of them in the face.
** This particular abuse caused some, currently unknown, [[ObviousRulePatch changes to the Extraspecies Exchange Laws.]]
** In Chapter 14 and episode 6 of the anime, [[spoiler:a director tried to use the loophole of recording documentary of Kimihito's female guests to get away with taking uncensored film recordings, Miia's shed skin, and Papi's egg to sell for money. [[SpannerInTheWorks Good thing]] Suu and Kimihito were there.]]
** In Chapter 16, a man tries to use the 'monsters can't harm humans' rule for[[spoiler:...[[AttemptedRape VERY bad reasons.]] Unluckily for that guy (and luckily for everyone else), [[BullyingADragon Rachnera doesn't give a shit.]] ]]
** Papi and other Harpies lose their memory after taking three steps. [[spoiler:As long as they can avoid that however it will last much longer]]
* {{Lunacy}}: The full moon apparently awakens a monster girl's more primal instincts. And wouldn't you know it, it comes the night [[spoiler:Ms. Smith introduces the inter-species marriage addendum.]] Poor Kimihito spends the whole night [[spoiler:trying to avoid some unwanted monster sex.]]
* MadeOfIron: Kimihito can take ''a lot'' of punishment. Subverted when [[spoiler:Lala explains that in a lot of cases '''he does die''' from his injuries but is too stubborn to stay dead.]] Lampshaded in Chapter 38, where the hospital doctors can't figure out how he's uninjured despite the daily abuse.
* MaleGaze: A plethora of them happen in chapter 43 at [[spoiler:Polt's gym. When Polt and Miia show off some stretches, the human male clients are shown thinking and enjoying the ladies' large and bouncy breasts]].
* MarryThemAll: Suu thinks [[http://2.bp.blogspot.com/-IjjvOZiGdYs/VPp0yy8oCmI/AAAAAAAAJ5E/cbU_m_P6xJE/008.png?imgmax=3000 this is probably the best way]] to solve Kimihito's "harem problem." Of course, whether or not she fully understands what marriage is is an open question.
* MarsNeedsWomen: Gender-flipped. Lamias and harpies are both female-only species and require human men to mate with in order to perpetuate the species. [[spoiler: Chapter 27 reveals that lamias had previously kidnapped men as sex slaves for this, but were forced to stop with the species exchange program and Miia's original purpose was to find a man to bring back as a communal husband for her village]]. Alraune, from Episode 11's [=MonMusu=] Collection, are similar, requiring other species to propagate.
* MarshmallowHell:
** Kimihito is often put into this by Miia and Centorea.
** [[StatuesqueStunner Tionishia]] gets in [[BoobsOfSteel on the act]] in Chapter 22.
** [[UpToEleven Taken Up To Eleven]] in Chapter 29, when he found himself [[spoiler: drowning between Cerea and her mother's breasts]] while [[spoiler: they were making up after their duel]].
** In Chapter 36, it's Octo's turn to smoosh him.
** [[UpToEleven Taken up past Eleven]] in chapter 41 where while his head is on Tionishia's lap, she leans over to grab something and nearly kills him with the weight of her breasts.
* MassOhCrap: In chapter 26, Centora, Miia and Papi have one when they realize [[spoiler:their mothers are coming to visit]].
** The racist guy and his gang when Rachnera [[BigDamnHeroes comes to spoil their]] [[AttemptedRape 'fun'.]]
* MaybeMagicMaybeMundane: Due to the extra-species highly resembling creatures from myth and fantasy, it's sometimes assumed in-universe that they have supernatural powers, such as the rumor that Octo can grant wishes. However, as noted under deconstruction, the series bases as much of the extra-species' features in real-life science as possible, as so far no species has displayed any supernatural powers, save for [[spoiler:the Dullahan race, which Lala shows at the very least can teleport and can manipulate death.]]
* MeaningfulBackgroundEvent: In Episode 11, if you're paying close enough attention, [[spoiler: you can spot "D" [[https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtl1/t31.0-8/11999612_774896442621116_7184502263175840496_o.jpg in the background of at least one scene before she actually appears]].]]
* MercyKill: A typically weird and light-hearted variant. [[spoiler:When there's a dedicated effort to make the undead welcome, productive members of society, 'curing' terminal diseases with zombie bites can become quite tempting.]]
* MermaidProblem: [[AvertedTrope Not an issue]] for any of the girls (Mero, and Miia with her similar body structure, have genitalia on the ventral portion of where their human halves transition into tails), but referenced by some hecklers.
** As early as the first volume, Miia is shown lying on a bed, (almost) completely naked, just wearing "panties" (actually an adhesive triangle of cloth that sticks to her very human genitalia). From what you can see, her snake tail has a lengthwise crease where it connects to her human waist, making it look like Miia had legs, but they then fused together to form the snake part of her.
** Discussed a bit during the gym chapter: Centorea doesn't have anything between her ''front'' legs, but still wears clothing there because to not do so would make her look naked from a human perspective, despite not actually showing anything.
* MistakenForCheating: Cathyl believes her home-stay carer/boyfriend is cheating on her when she hears him talking to several girls in the barn late at night. [[spoiler:Kimihito later recites off their names, explaining that those are the names of the farm's sheep and cows.]]
* MomentKiller: With such a large harem of extremely jealous girls, it's assured that as soon as Kusuru gets into a situation that starts turning romantic, one or more of the other girls will interrupt it.
* [[MonsterOfTheWeek Monster Girl of the Week]]:
** The series takes this formula from chapters 19 to 22. In order, we get a [[DraconicHumanoid dragonewt]], a [[PlantPerson dryad]], a [[OurDemonsAreDifferent devil]], [[spoiler:and a [[WalkingSpoiler dullahan]]]]. Notice a theme? You shouldó [[spoiler:the first three are {{Red Herring}}s for an anonymous assassin going by "D," and while "D" was initially determined as a fake in Chapter 22, a SECOND letter comes in. At first, it seems to be an actual [[{{Yandere}} threat]], but then in Chapter 24 it's revealed to be a Dullahan with a penchant for long-winded speeches and pretending to be the [[GrimReaper Grim Reaper]].]]
** It takes this formula again during the vacation arc in chapters 31 to 34, where we get a [[AnIcePerson yuki-onna]], a [[{{Kitsune}} nine-tailed fox]], a [[ALoadOfBull minotaur]], a [[FaunsAndSatyrs faun]], a pair of [[PlantPerson barometz]] and a [[LizardFolk lizardwoman]].
* MoodWhiplash:
** The introduction of the [[PigMan Orcs]] has a good amount of this. First they enter the store, armed with [=AKs=], and take the workers as hostages. Then they make their demands which are... to get [=OrcXElf=]/Princess/Royalty/Slave/everything pornography. Hm. Maybe these guys are not so threatenWTF?! Did one of them just unload their bullets into the stomach of a police officer while taking another hostage as a rape victim?! [[spoiler:[[OurZombiesAreDifferent The officer]] and the [[{{Doppelganger}} "rape-victim"]] are actually part of [[AmazonBrigade MON]], make it out easily, and end the threat, but still, that was one hell of a mood change.]]
** In Chapter 18, the monster girls believe Kimihito is cheating on them with Ms. Smith. Hijinks ensue as they follow their "date" until they learn the real reason for it: [[spoiler:Kimihito received an anonymous death threat and they're trying to flush out the perpetrator.]]
** Chapter 22 has the reveal that "D" was [[spoiler:Doppel all along.]] The group laughs it off as a well-intentioned plan gone horribly awry. [[spoiler:Then a second letter from a REAL threat comes along, and everyone assumes it's just Doppel again.]] The real clincher is [[spoiler:a Dullahan hooking Kimihito by the neck with her scythe.]]
** Chapter 38 goes from Lala hilariously visiting Kimihito in the hospital to [[spoiler:her having to figure out whether to prevent the death of a terminally ill girl she meets. For just a moment she drops the overblown grim reaper act and legitimately doesn't know what to do. She eventually comes to a solution though. See TakeAThirdOption below.]]
* MortonsFork: Kimihito is presented with one at the end of chapter 5. Ms. Smith says the government is going to try out inter-species marriage, and decided he was going to be the test case. So she tells him to marry one of the girls living with him. Since all three of them are {{Clingy Jealous Girl}}s however, this doesn't work out well for him as they all try jumping him at once in the next chapter, once [[{{Lunacy}} the full moon]] puts them in the mood.
* MumLooksLikeASister: Miia's, Papi's and Centorea's mothers all look barely older than their daughters. While for Papi's mom this is to be expected (Harpies' petite bodies allow them to fly), no reason is given for why Miia's and Centorea's mothers look that way and is even lampshaded in the case of Miia's mother.
* MundaneUtility: In chapter 27 Kimihito decides to thoroughly clean the house before Miia's mother arrives. Papi uses her wings as a feather duster and Suu turns into a Roomba to clean the floor.
* MushroomSamba: In Chapter 45, when Kimihito and Centorea get home, they find that the interior of the house has somehow turned into a giant dungeon, Papi is now a tiny fairy-harpy, and Suu is a giant monster slime. [[spoiler: Mero reveals that it's all a hallucination caused by inhaling the spores being given off by a mushroom-like person that Papi brought home. She managed to avoid being affected because she breathes mostly through her gills, and the spores aren't transmitted through water.]]
* NakedPeopleAreFunny: The nudity is played for [[{{Fanservice}} titillation]], but most scenes also invoke this mentality. Hijinks often ensue because someone got naked where they weren't supposed to.
* NeckSnap: Kimihito is on the receiving end of this courtesy of Miia during the shedding scene. [[MadeOfIron He's better in the next scene, of course.]]
** Miia performs a less severe version on Centorea in Chapter 12 to snap her out of a medieval fantasy with Mero. Centorea is still massaging her neck several panels later.
* NeverLiveItDown: The fact that Miia has dislocated Kimihito's shoulder in Chapter 1 is brought up multiple times throughout the series. Chapter 11 has her almost drown in Mero's personal pool because her body cooled down, and she's embarrassed when the incident is brought up twice in Chapter 17, especially when Kimihito initially doubted that she could swim at all[[invoked]].
* NewPowersAsThePlotDemands:
** It's nearly becoming a running gag for Suu to randomly turn out to have whatever power is needed this week. Of course, Suu is a previously unknown species, so this could simply be a case of powers no one knew about, rather than spontaneously displayed.
*** Suu suddenly shows off a whole raft of new imitation-based powers in Chapter 13, including shapeshifting into a fairly convincing duplicate of another person.
*** In the same chapter, shown briefly, is what seems to be a empathy link ability, as Suu was able to suddenly experience every sensation Kimihito was feeling while sick by touching his forehead with the tip of the slime feeler on her "hair". In the next chapter, it was shown that this extends to being able to read minds in general, as she did to expose the director's true nature to the rest of the cast.
*** In chapter 18, Suu imitates clothing and limbs to disguise the other monster girls as humans.
*** In chapter 20, Suu turned into a {{Kaiju}} and apparently doing so makes her smarter, though she had to fall into a pile of experimental fertilizer first so it may be a one-off event.
*** The intelligence boost returns in chapter 31 when she absorbed the minerals from the hot spring they were visiting.
*** As of chapter 25 Suu can detect poisons and changes shape to indicate them. This despite being apparently immune herself (though it does "poison her words", as observed by Kimihito). Also she can spit ingested poisons at others.
*** As of chapter 30, Suu is also apparently able to heal injuries to a certain extent, shown when she healed the torn skin on Kimihito's finger simply by putting said finger in her mouth (although the kind act was overshadowed by her smothering and once again nearly drowning him). As of yet, it isn't clear whether this ability only functions for small injuries like the torn skin on the finger, or if it would work for larger injuries as well.
** In chapter 18, Rachnera reveals that she can use her thread like a cup telephone.
*** In chapter 32, Rachnera forms clothing from her thread almost instantly. Kimihito promptly lampshades this by saying that it's kind of ridiculous.
** While pursuing Miia and Kimihito, Miia's mother suddenly reveals that she has Pit Vision which lets her track via infrared heat.
* NiceJobBreakingItHero:
** In general, the girls tend to break windows and doors anytime they suspect Kimihito of trying to get intimate with one of the other girls.
** In chapter 12, Kimihito has Meroune in a BridalCarry, causing Miia to get insanely jealous and slam into them to break them apart. Turns out that he was just carrying her to the second floor so she could see what was up there. Miia also breaks Meroune's wheelchair in the process, so now he has to carry Mero that way for the rest of the day, something the former is not pleased about.
** [[spoiler:Lala performs an EmergencyTransformation and turns an ill girl into a zombie so she can live after passing away. Unfortunately she used one of Zombina's teeth landing her, and the rest of the MON squad in hot water.]] Oops.
** Dopple tries to make Draco apologize to Miia, making sure they'd run into each other and providing the perfect opportunity. Unfortunately she arranged for Liz, who Draco had also angered, to show up so she could reconcile with her too. Making it look like shes going behind both their backs getting them even madder at her.
* NinjaLog: Another of Rachnera's many abilities (see NewPowersAsThePlotDemands above) that shows up in chapter 55. At one point it looks like Kimihito fell inside the giant toxic slime and his body started to melt, but it was actually a decoy puppet made of Rachnera's silk, that looked exactly like the real person. For bonus points, Rachnera seems to be dressed as ''kunoichi'' (ninja women) usually are in fiction, fishnet top and all.
* NippledAndDimed: The manga freely displays nipples, but the anime won't. It usually gets by, except when Zombina purposely detaches a breast to make Kimihito pick it up, what we see is a featureless lump of flesh. This, however, is simply a case of TooHotForTV.
** The OVA, however, not being intended for TV broadcast, really goes to town on it.
* NoCartoonFish: In Chapter 19, the various sea life seen in the aquarium are drawn in a very realistic art style compared to the rest of the manga.
* NoNudityTaboo: Most if not all of the Monster Girls in the series have this to at least a minor extent and are universally at least less embarrassed by it than human women would be. Kimihito comments on how the mandatory mixed bathing policy of the hot springs they were at had scared away all of their female customers, and all of the members of his harem react with surprise that this would be the case, or otherwise express openness or indifference to the concept of mixed bathing, which later gives them the idea to [[spoiler:combine that knowledge with Centorea's mixed bath dating idea she had when discussing ways to bring in customers and have the resort feature interracial dating meetups in the onsen]].
* NoPeriodsPeriod: Averted in Chapter 14 and Episode 6 of the anime, which revolves around Papi laying an egg, the bird equivalent to a period.
* {{Nosebleed}}: Kimihito tends to get these, most notably the first episode of the anime when Miia bathes in his presence. It's generally in response to seeing nipples.
* [[NotUsingTheZWord Not Using the M Word]]: "Liminals", or Extra Species, is the more politically correct term for Monsters in the English manga. Admittedly calling them ''Monsters'' can have very negative connotations for such a racially fragile situation.
* OlderThanTheyLook: Miia seems rather calm at the prospect of Papi and Kimihito bathing together. Reason?
--> '''Miia:''' "I can be calm and mature because I'm a woman and she's a child."\\
'''Ms Smith:''' "She's actually your age."\\
'''Miia:''' [[ClingyJealousGirl (breaks down door to bathroom)]]
** Harpies tend to look like young teenagers even when fully grown [[JustifiedTrope for the sake of flight.]]
** The various devil subspecies all look to be a particular age, even if they're actually much older.
* OneGenderRace: Lamiae and harpies are both all-female races.
* OneNoteCook:
** While Miia is usually a LethalChef whose cooking is dangerous to consume, she is actually pretty good at fixing eggs.
** Centorea is a good cook by centaur standards, but as centaurs are herbivores her cooking skills are limited mostly to raw vegetables and salads.
* OnlyOneName: Most characters go under this, when they're not [[NoNameGiven nameless]]. Exceptions are Kimihito Kurusu ([[OnlyKnownByTheirNickname mostly]]), Centorea Shianus, Rachnera Arachnera and [[AwesomeMcCoolname Meroune Lorelei de Neptune]]. And, if [[http://s13.postimg.org/r7kqlk60n/1442081515644.jpg this piece of merchandising]] is canonical, Kuroko Smith.
%%* OurMonstersAreDifferent
* OurCentaursAreDifferent: While the female centaurs of this world are more like English knights of a royal Court, the males are instead modeled after the stereotypical barbarian hordes from other works. Centorea even has a full body suit of armor. They also have horse ears instead of human ears. The [=MonMusu=] Collection in Episode 3 covers centaur subspecies such as the FragileSpeedster lightweights; the large, muscular heavyweights, who're generally amiable and absent-minded; and the dairy breeds, who serve as wetnurses for other centaurs who are having difficulty with breastfeeding.
* OurDemonsAreDifferent: Devils resemble humans with horns, bat wings, and a tail. According to Episode 12's [=MonMusu=] Collection, subspecies are identified by how old they look (which gives no indication as to [[OlderThanTheyLook how old they actually are]]). Lesser devils look like children and enjoy playing pranks. Greater devils look like older human teens, and enjoy dressing in human fashions (unfortunately for them, [[OutdatedOutfit they're often out of date]]) as well as playing pranks. Elder devils look like human adults, and can potentially [[LongLived live for centuries]], resulting in them setting aside other devils' trickster ways.
* OurMermaidsAreDifferent: One of the characters is a mermaid named Meroune. The [=MonMusu=] Collection in Episode 5 reveals several sub-species like sharks, former pirates whose fish bodies have a cartilage skeleton like sharks; fresh water class, a nomadic species that travels between rivers and oceans like salmon; and eels, who have long snake-like bodies that allow them to live on land and produce even more mucus than the other mermaids.[[note]]The eels are notable for appearing in the manga before Episode 5 was released.[[/note]]
* OurOgresAreHungrier: The ogres in this world are horned and very large, but all of them are {{Gentle Giant}}s. Episode 9's [=MonMusu=] Collection shows some sub-species, like oni, who are smaller than regular ogres, can have skin colors like [[RedOniBlueOni red and blue]], and are native to Japan; [[AllTrollsAreDifferent trolls]], who are larger and more muscular than regular ogres; and [[OurGiantsAreBigger gigantes]], who are the biggest of all with heights of over 10 meters, and also the gentlest.
* OurZombiesAreDifferent: The zombies of this world were created by a disease, making them effectively {{plague zombie}}s, albeit benign ones. Due to their dead bodies, they can't heal injuries and are in danger of decaying unless special measures are taken. Episode 8's [=MonMusu=] Collection reveals some sub-species, like the early zombies, who were created before modern preservation technology existed, forcing them to live in cold environments to avoid decaying; the {{mumm|y}}ies, who live in deserts and require long baths to moisturize their bodies; and the jiang shi or [[ChineseVampire Chinese hopping vampires]], zombies from Asian countries whose stiff joints cause their arms and legs to be locked straight, so they alleviate the stiffness by practicing tai chi.
* OutOfCharacterMoment:
** Kimihito is usually a pragmatic and humorless person, but in Chapter 39 he does crack a joke about Zombina being able to discard unwanted body parts... while being chased by a psychotic jiang-shi and carrying Zombina who has been bisected by Shiishii, the aforementioned jiang-shi! It's possible that, since the chapter is an action movie pastiche of sorts, he wanted to try what's it like to be an action hero who casually spouts cheesy one-liners.
** In Chapter 22 and the related anime episode Manako mentions having liked the creepy and edgy message written by "D" [[spoiler:actually Lala]], full of references to death, darkness and hellfire. She never displays any NightmareFetishist tendencies at any point in the series. But maybe she was just envious because nobody sends her "love" letters...
* OutOfFocus:
** Lala is barely noticeable outside her introduction and Chapter 38. Sure, one of her traits is that she has little presence and struggles to be noticed (and let's not speak of her social anxiety...).
** After the mothers arc, Papi has become little more than a background character until the mushroom arc, where she becomes plot important, and the vampire arc, which centers around her.
* OutOfGenreExperience:
** Chapter 11 puts the harem comedy on hold for a terrorist hostage rescue. A ''silly'' terrorist hostage rescue [[spoiler:with orcs demanding orc friendly hentai manga]].
** Chapter 38 completely skips over the typical {{Fanservice}} and downplays the comedy. The story is mostly about Lala's relationship with a terminally ill girl at the hospital.
* OutWithABang: The same [[spoiler:moon that puts the girls into a mating frenzy]] also causes them to forget their inhuman strength and cease holding back. Kimihito, his willpower wavering, suddenly realizes ''exactly'' what that means for him if he gives in.
* ParentalAbandonment: Kurusu reveals in chapter 16 that he lives with his parents (who are currently abroad).
* PayEvilUntoEvil: So you think you're safe from doing wrong to monster girls just because of an exploitable protection law? Kimihito and Rachnera would like to prove otherwise.
* PervertRevengeMode: Zigzagged. Sometimes the girls play it straight, sometimes they're actually amused by Kimihito's AccidentalPervert moments. When he accidentally walks in on Centorea in the shower, the next scene has him apologizing to her, sporting a nasty hoof-shaped black eye. Astonishingly for a scene like this, Centorea is ALSO apologizing: she never told him she takes a shower after her daily exercise.
* PillarOfLight: From the opening of the anime, the harem's love manifests as a giant pillar of light that ends up forming a giant heart, which they use to hit Kimihito with their emotions. As usual, the girls go overboard and he's knocked out.
* ThePlan: In chapter 18, Kimihito and Ms. Smith go out on a "date", prompting the girls to [[DatePeepers follow them around]]. In the end, it wasn't really a date, but instead an attempt to flush out a potential assassin who wrote a threatening letter to him if he should marry one of the girls. Ms. Smith then plans for all of the girls to go on a date with him in an attempt to flush out the perpetrator. Although they do meet some antagonists, none of them turn out to be the one who wrote the letter. Then a second one is sent. Then they finally catch a suspicious person in chapter 22, [[spoiler:who turns out to be Doppel, who was also the culprit for the first letter. She claims she wrote it so that he would go on a date with the girls, and hopefully pick one of them to marry, though it backfires HORRIBLY as he wound up getting closer to all 6 of his girls AND the other agents of M.O.N..]] As chapter 22 ends with the culprit found, they state [[CliffHanger they didn't write]] that second letter... [[spoiler:It was sent by a Dullahan named Lala who joins the house at the end of chapter 24]].
* PlantPerson: There're a number of plant-based species, noted for typically not associating with other species and not wearing clothes. Dryads are one such, an easy-going species associated with small to medium-sized trees and vines, who sometimes befriend helpful members of other species. Barometz are another, a species who resemble pan fauns, but produce cotton instead of wool. Episode 11's [=MonMusu=] Collection adds two others: alraune, a flower-associated species [[MarsNeedsWomen who require other species to mate]], and mandragora, a root-associated species, who are [[ShrinkingViolet extremely shy]] and who can [[SonicStunner scream so loud they knock people out]].
* PlanetOfHats: The various monster species usually have a personality trait or two that all of them share to some degree: harpies all have abysmal attention spans, lamia are all sex-hungry to some degree, and so on.
* PoorCommunicationKills: Essentially Chapter 28 with Papi and her mother. Papi believes her mom is trying to take her home [[spoiler:while her mother is just trying to recover the picture she accidentally added in her message of her and Papi's father]].
* PornStash: The girls stumble across Kimihito's in one of the anime's omake.
* PrettyFreeloaders: Chapter 43 reveals this is actually not the case. With the exception of Papi and Suu, who are too mentally immature to hold a job (not to mention that Suu, as a slime girl, is an open secret and not actually covered by the interspecies exchange program), and Lala, all of the girls living at Kimihito's house have a job, are actively seeking one, or have personal wealth; even Rachnera, who gets frequent requests for her silk from various laboratories.
* ProductionThrowback: Okayado's one-page comics included in the DVD sets have exactly the same style and format of his early pornographic comics, but obviously SFW and starring Kimihito and his harem instead of the eight unnamed brothers and their mates.
* ProductPlacement: The Chevrolet pick-up in chapter 9, kinda...
* PsychoLesbian: [[spoiler:Draco towards Miia]]
* PunchedAcrossTheRoom: When the two racists begin calling Miia names at the love hotel, Kimihito responds by hitting the male of the pair so hard that he's thrown into his girlfriend and they both get knocked outside.
* PunctuatedForEmphasis: When [[spoiler:Lala]] goes into another one of her dramatic speeches instead of telling Ms. Smith [[spoiler:why she ran away to see Kimihito]], she says:
-->'''Ms. Smith''': Why. Did. You. Come. Here?

[[folder:Tropes R to Z]]
* RaincoatOfHorror: Suu's body is actually liquid, and would thus soak through any clothes she tries to wear except for a raincoat. PlayedWith, in that this is from the Harem genre with material borrowed from the Horror genre.
* RapunzelHair: Several characters. Ms. Smith, Miia, Centorea, Mero, Lala, Doppel, Tionishia, Miia's mother, Papi's mother, Mero's mother, and Shiishii all have hair reaching (and in a few cases passing) their waists.
* RealityEnsues:
** Pretty much any time a monster girl's physiology becomes a plot point, as noted under {{Deconstruction}}.
** Kimihito's MadeOfIron status baffles the doctors at the hospital, who can't figure out how he doesn't have any serious injuries despite the daily abuse. They even force Kimihito to stay so they can run further tests on him, trying to find out why this is possible.
** While Centorea's GagBoobs are played for laughs, its damn near impossible for her to find a bra that can fit a chest that large (and if it does fit, it might just snap from the strain).
** When a Slime appears in the house Centorea, using videogame logic, believes she'll be able to dispatch. Not only does the "slime are weak enemies" logic not hold water, her sword does absolutely nothing to it's liquid body.
** Miia is unable to get a job at a small store, because she's simply too long to fit in it.
** After her date with Kimihito, Manako is not magically cured of her crippling shyness around people and fear of looking others in the eyes. She mentions that she'll try to overcome her fears, if anything.
** Miia, an untrained gym trainer, doesn't realize humans don't have the same bodily limits as she does and many of her students end up hurting themselves with some lower body stretches.
** Mero's obsession with tragedy leads her to try and invoke AllLoveIsUnrequited. Only to realize its not all its cracked up to be when once she realizes how painful losing Kimihito to another girl would actually be.
* TheReasonYouSuckSpeech: [[spoiler:Kimihito]] of all people gives one to Ren, a member of Rachnera's previous host family who wanted to take her back. She is berated for treating Rachnera living with her family as a trial to endure, rather than considering Rachnera's own feelings on the matter.
* ReptilesAreAbhorrent:
** Discussed in Chapter 26. When Miia is once again planning an evil scheme to get rid of one of her "competition", Mero and Cerea think this is why snakes have such a bad reputation.
** In Chapter 32, she (reluctantly) takes the role of the play's antagonist named "Cobra Miia".
** Averted in chapter 43 when Miia finds [[spoiler:dozens of Japanese people who visit shrines believe snakes are lucky and want to get pictures with her. This even helps her get a job working there]].
* RewatchBonus: Doppel as an IncrediblyObviousTail in chapter 22, and also knowing from Chapter 30 that [[spoiler:[[TheyKilledKennyAgain Kimihito's actually dying and coming back to life over and over again.]]]]
* RPGEpisode: Chapter 45 is a downplayed example. Kimihito returns home only to find himself into a huge dungeon, with the girls turned into characters straight out of a fantasy RPG: Centorea is a paladin, Papi a fairy, Miia a princess (later on, a shrine maiden), Rachnera a thief/merchant, Suu a giant slime and Lala as basically a more "edgy" and intimidating version of herself. It turns out that it was all a collective [[MushroomSamba shared hallucination]] caused by [[spoiler:the spores released by Kino, the matango (humanoid mushroom).]]
* ScoobyStack: Centorea, Miia, and Papi do this in chapter 5 after Kimihito wakes up from getting hit by three tranquilizers Ms. Smith shot at him accidentally.
* ScrewDestiny: Essentially what each of the "Mothers coming to visit" chapters boil down to.
* SeductiveMummy: The [=MonMusu=] Collection endcard for episode 8 of the anime describes mummies as a [[OurZombiesAreDifferent zombie subspecies]] whose native environment keeps their bodies intact and protects them from decay, resulting in them looking like attractive humans with parts of their body in bandages. The downside is that their environment robs their skin of its moisture, so they need to take long baths to replenish it, supplementing it with the placebo measure of sucking the life-force out of young men.
* SeldomSeenSpecies: Among the many extraspecies girls in chapter 49 there are owl harpies (a subspecies of raptor harpies), a leech girl and a lamprey girl (a subspecies of eel mermaids).
* SelfFulfillingProphecy: When Lala first shows up, she claims to be a Grim Reaper here to pick up Kimihito, who was going to die soon. All of the girls besides Rachnera then run away from the house with him in tow. But their attempts to "save" him make things worse, such as Centorea dragging him behind her after he falls off, Meroune nearly drowning him, and Miia nearly constricting him to death again. Then Ms. Smith shows up and explains who Lala really is. [[spoiler:Her species likes to spout off high art, difficult to comprehend things. The fact that they can detach their heads only adds to that illusion. But Ms. Smith tells them Lala isn't really much different than they are. But then in chapter 30 it's revealed that Lala actually ''is'' a {{Psychopomp}} who's pretending to be a gothy teenager pretending to be a psychopomp and she actually was attracted to Kimihito because of how regularly he was in mortal peril.]]
* SeriousBusiness:
** Ms. Smith says the law is pretty clear that a human and non-human in the same homestay program having sex is a big no-no, and will lead to criminal charges for the human, along with the non-human being deported. (Which is pretty much what happens in RealLife.) So naturally when Kimihito accidentally takes Miia to a love hotel (because she wanted to go somewhere private where people couldn't keep gawking at her, and was also big enough to fit her), Ms. Smith leads a police SWAT team and they blow the door away into the room when they hear about a human and non-human going into a love hotel. Miia taking off her clothes and telling Kimihito to do it with her right before the cops bust in doesn't help matters any.
** When Kimihito gets sick in chapter 13, Ms. Smith quarantines the girls from nursing him lest they catch his illness. While he only had a little cold, she explains it as if they'd waste away if they caught it (an idea that Mero finds romantic), so they send Suu to nurse him back to health, but not before giving her all sorts of weird ideas such as feeding him something strange Miia cooked up. However this could be subverted as it is clear Ms. Smith just used this as an excuse to get out of doing mountains of paperwork and falls asleep soon after arriving to "help".
* ShaggyDogStory:
** Kimihito's food hunting in Chapter 25. After much trouble, he finally manages to secure a large supply of food, even creating a banquet for his tenants... [[PrettyFreeloader then MON came along]] and [[BigEater helped themselves.]] The supplies went down ''fast'' in a combination of HeroicBSOD and UnstoppableRage... [[ItMakesSenseInContext of cooking]]. Then the knife is [[UpToEleven further twisted]] in another direction when it's revealed that [[spoiler:the bureau is ready to reimburse any expenses for housing extra species. Including food. [[BrickJoke Ms. Smith had to remind him that they]] ''[[BrickJoke did]]'' [[BrickJoke modify his house for housing Meroune for free.]] ]]
** Papi's mother's visit in Chapter 28. It seems as if she's there to bring Papi home whether the latter wants to or not. [[spoiler: In reality, she had just come to get the picture of her and her human husband, which she'd accidentally mailed to Papi. The conflict was due only to the fact that [[MyHovercraftIsFullOfEels her Japanese was incomprehensible]]. ]]
* ShesGotLegs: When asked what he likes best in a woman in an omake, Kimihito says "legs". Going by his response to Rachnera in the main story when he first meets her, the species of the legs in question doesn't seem to be foremost on his mind, meaning that for his harem, this is only an issue when it comes to Miia and Mero, neither of whom have legs.
* ShootTheHostage: Zombina, being undead, is not adverse to shooting through her own body to surprise kidnappers.
* ShotgunWedding: Miia's mom tries to force "Darling" into one.
* ShoutOut: Numerous examples, which belong on [[ShoutOut/DailyLifeWithMonsterGirl the subpage]].
* ShownTheirWork: The series often incorporates aspects of real-life animals into the biology of the monster girls, some of them pretty obscure.
** Miia's horrible cooking and Cerea's bland dishes are both justified by real-world biology. [[http://animals.pawnation.com/animals-taste-buds-6163.html Omnivores]] (like humans) have over twenty times as many taste buds as carnivores (like snakes)--of course Miia's cooking tastes fine to her. On the other hand, because herbivores, like Cerea, generally have twice as many taste buds as omnivores, omnivores just can't appreciate her vegetarian cuisine.
** Spiders do [[http://en.wikipedia.org/wiki/Effect_of_psychoactive_drugs_on_animals#Spiders get drunk on caffeine]].
* ShutUpHannibal: Rachnera's response to the second breaking speech? [[spoiler:Tie Lilith up and dominate her into a weak sub]].
* SickEpisode: Kimihito spends most of Chapter 13 sick in bed, with Suu taking care of him.
* SillyMeGesture:
** Miia does this in Episode 6 of the anime after she tells everyone why she didn't taste [[LethalChef her food]] before serving it to them.
** Ms. Smith does this in Episode 7 when explaining that Rachnera "went outside without authorization" (that is, she managed to escape Ms. Smith and MON).
** Papi does this in Episode 10 after Kimihito scolds her for having forgotten Kii.
* SlimeGirl: Humanoid slimes are a very recent discovery in this series, with Suu being the only one known. The [=MonMusu=] Collection at the end of Episode 4 reveals some subspecies, including red slimes, whose bodies are very acidic; green slimes, whose bodies are poisonous; pink slimes, who feed on nectar and smell like flowers; and black slimes, who have fallen foul of human pollution.
* SnakePeople: Lamiae, like Miia. The [=MonMusu=] Collection at the end of Episode 1 lists several other subspecies, including the viper-like echidna; the {{medusa}}, whose angry glare comes from her poor eyesight; and the melusine, a shore-dwelling creature with a set of [[WingsDoNothing impressive but purely-vestigial wings]].
* SomeoneToRememberHimBy: Meroune tries to invoke this when Lala says Kimihito is about to die, planning on recounting his death to their children. Miia stops her before she can get anywhere though.
* SophisticatedAsHell: In the English translation of the manga at least, during the flashback to when humanity put a stop to the Lamia habit of keeping Tribe Husbands:
-->'''Government Agent:''' Sorry, ladies. We've been turning a blind eye to it up 'till now, but you are hereby charged with kidnapping, assault, and [[ArsonMurderAndJaywalking weird, kinky crap.]]
* SpiderPeople: One of the characters is an arachne named Rachnera. The [=MonMusu=] Collection in Episode 6 covers sub-species like the small breeds, which are smaller but good jumpers like a jumping spider; the long legs breed, which have long thin legs and look and live like wolf spiders; and the large breeds, which are larger and covered with hair like a tarantula.
* SpitTake:
** Ms. Smith does one in chapter 5 when Kimihito blames her for the latest incident between Centorea, Miia, and Papi fighting, when she accidentally shoots him with three tranquilizers meant for the girls.
** Cerea does this in Chapter 26 after hearing [[spoiler: Kimihito deny Ren from being Rachnera's host family again]]. By doing so she sprays Miia which results in Suu attacking Miia [[FunnyBackgroundEvent in the background]].
* SpoilerOpening: The opening shows [[spoiler: Papi, Centorea, Suu, Meroune and Rachnera]] before they actually appear in the series. It also shows [[spoiler: a quick insert of the MON squad]]. Interestingly, it does not show [[spoiler: Lala]].
** Also a spoiler ending, showing [[spoiler: all the MON girls in greater detail, revealing that they are a special monster squad,]] even though they're only introduced halfway through the anime.
* StalkerWithACrush: Draco towards Miia, [[spoiler:and [[{{Yandere}} "D"]] toward Kimihito.]]
* SuckOutThePoison:
** In Chapter 20, a dryad Papi found (and then planted) grew into a 50-foot violent behemoth due to absorbing toxic waste. Suu absorbed the same waste and also grew huge, but managed to keep sane. Apparently, her new super-size also grew her brain, because she suggested that the best course of action would be to remove the toxin from the dryad's system. Papi immediately jumps on the dryad's giant breast and attempts to suck the toxin out...through her nipple. She is swatted away, and Kimihito is pressed onto the dryad's breast and commanded to finish the job. ''Awkward'' [[CringeComedy does not even]] ''begin'' to cover it. The worst part? [[spoiler: It actually worked.]]
** Chapter 44 has Centorea protecting Kimihito from the attack of an angry hornet girl. She gets stung right on the nipple for her troubles... you can see where this is going. [[spoiler: The next chapter reveals that the venom was actually quite weak so Centorea was never actually in danger. [[NotSoAboveItAll She was just using it as an excuse to get Kimihito to touch her]].]]
*** Lampshaded with a box on one panel that says that this technique doesn't actually work.
* SuperhumanTrafficking: The Director buys exotic monster girls and sells them into slavery.
* SupernaturallyDeliciousAndNutritious: When Kimihito [[GotVolunteered gets volunteered]] by Ms Smith [[ItMakesSenseInContext to allow several blood-sucking monster girls to feed on him]], they all comment on how unusually tasty his blood is.
* SuperWindowJump: Happens regularly. Luckily, the windows are made of SoftGlass.
* SureLetsGoWithThat: When Octo ends up tangled in threads after getting close to Kimihito.
--> '''Octo:''' "You... you set a trap for me knowing that I would go after him?!"\\
'''Rachnee:''' *Looks confused for a moment* "That's right!"\\
'''Kimihito:''' "What was that look just now?"
* SwitchedAtBirth: In an omake featuring Miia, Centorea, and Papi's mothers together, Papi's mother explains that harpies in the same family group have an UncannyFamilyResemblance to the point of being InexplicablyIdenticalIndividuals. Combined with harpies' [[TheDitz birdbrained natures]], mixing up one another's children actually happens a ''lot''. Papi's mother is ''pretty'' sure Papi is actually hers.
* TheSymbiote: [[AllThereInTheManual There's speculation]] that the head and body of a dullahan are two separate organisms.
* TakeAThirdOption: [[spoiler: When Lala is unsure of whether to save a dying girl's life or not, she settles on a middle ground: stealing one of Zombina's teeth and turning her into a Zombie so she can keep living after she should have died.]]
* TapOnTheHead: Averted in Chapter 38. [[spoiler:Lala slams her scythe down on Kimihito's head with the specific intention of nearly killing him, so they could have a private talk in the afterlife.]]
* TemptingFate: {{Subverted|Trope}} with a vengeance in chapter 24. When confronted with his alleged fated demise and after going through [[{{Irony}} too many close-calls during the chapter]] [[SelfFulfillingProphecy thanks to the girls trying to protect him]], Kimihito gets fed up with the situation and stomps away while quoting every DeathFlag[=/=]FamousLastWords he can think of.
-->'''Kimihito:''' [[IfWeGetThroughThis Miia, if...]] ''[[IfWeGetThroughThis if]]'' [[IfWeGetThroughThis I make it back alive, we're getting married!]]\\
'''Miia:''' [[GenreSavvy Huh... Wait, Darling! That's a Death Flag!]]\\
'''Kimihito:''' [[DeathByPragmatism I'm not sticking around here!]] [[ScrewThisImOuttaHere I'm going home!]] [[note]]A bit of {{Woolseyism}}. The original line (こんな所にいられるか!俺は部屋に帰らせてもらう!) seems to go more along the lines of a horror/suspense movie character who decides to step into an apparently secure enclosed location only to discover that the killer/monster is already there and he/she gets killed.[[/note]]\\
'''Miia:''' STOOOOOOP!\\
'''Kimihito:''' [[VisualNovel/{{Air}} Can I just go to the goal right now...?]]\\
'''Miia:''' Wait, Darling!\\
'''Kimihito:''' [[VisualNovel/FateStayNight You don't mind if I beat that thing, right?]]\\
'''Miia:''' [[LeaningOnTheFourthWall Of all things why do you have to raise so many Death Flags?!]]\\
'''Kimihito:''' [[VideoGame/ElShaddaiAscensionOfTheMetatron No problem, everything's fine.]] [[Anime/PuellaMagiMadokaMagica I'm not afraid of anything anymore!]]
* ThemeTuneCameo: Some of the web shorts have the girls hum one of their {{image song}}s, and one of them has Papi hum the anime's main theme. Doubles as an EarlyBirdCameo, as the image songs weren't revealed until after the shorts were released.
* ThemedHarem: {{Cute Monster Girl}}s. By chapter 4 there is a Lamia, a harpy, and a centaur, all living with one guy. It's [[LampshadeHanging explicitly referenced]] in chapter 6 by one of the girls. Chapter 8 adds a Slime girl [[AudienceParticipation by popular demand]], and chapter 10 adds a Mermaid using the same method. Chapter 15 also adds an Arachne, and chapter 24 adds a Dullahan. As of Chapter 22, MON may well be on the way to joining them. And Chapter 25 drops hints that the Dryad girl from chapter 20 may end up in here as well, since she needs to pick a host family and the only human she seems to be able to stand is Kimihito.
* TheyKilledKennyAgain: [[spoiler: [[RewatchBonus In hindsight]], Kimihito is actually this. [[WalkingSpoiler Lala]] reveals in Chapter 30 that he ''actually dies'', but he's just too stubborn to stay dead.]]
* ThoseTwoGuys: The racist couple. For some strange reason they have a tendency to be at the same place as Kimihito and the girls who live with him at certain occasions. And yes, [[PoliticallyIncorrectVillain they do constantly spew racist insults at the girls]] and [[{{Jerkass}} act like dicks around pretty much anybody they come across, humans or not]]. And yes: they do have a tendency to get their [[LaserGuidedKarma just desserts]] in the end.
* TitleDrop: At the very end of the 12th ([[TwelveEpisodeAnime and final]]) episode.
-->'''Kimihito''': ''It's a bit noisy and difficult at times, but every day is a lot of fun. That's everyday life with monster girls, I guess.''
* TogetherInDeath: Lala is mostly unconcerned by the continual rivalries for Kimihito's affections, since she seems to be planning on this. As she puts it, [[spoiler: talking to him on one of his many return trips to the afterlife,]] "All will die, that is destiny. Even a marriage would end when death comes... If you die, your soul belongs to me. So once you die, just leave the rest to me."
** Back during Lala's introduction, Miia had tried to invoke this when she couldn't protest further against Kimihito being doomed to die and the girls' attempt to save him only edging toward a SelfFulfillingProphecy.
* TrashOfTheTitans: Ms. Smith's apartment is filled with trash bags and stacks of stuff when seen in chapter 4.
* TwelveEpisodeAnime: The anime has 12 episodes, with each episode adapting two chapters from the manga.
* TheUnmasquedWorld: By the time the story begins, the existence of monster girls has already become public knowledge for some time. However there are still some monster types humans are unaware of. Slimes ''[[BrokenMasquerade were]]'' one of them.
* TheUndead: Zombies, of course. Interestingly, dullahans are not, despite their detachable heads and their general demeanor revolving around death.
* UnmovingPlaid: The orc leader's camo jacket in episode 7.
* UnprovokedPervertPayback:
** When Papi tells Kimihito she's about to lay an egg, he gets beat up by the other girls, as they assumed he had sex with her. They're relieved when they find out it's just an ordinary unfertilized egg, much like a chicken would lay. Unfortunately he's got several lumps on his head due to their beating.
** In Chapter 39, Zombina hits Kimihito when her shirt gets torn upon over a splinter on the wooden floor while he's trying to sew her body together. She admits to herself that her newfound sense of modesty is unusual, as she had once been shameless enough to purposely remove one of her breasts and make him sow it back on.
* UnwantedHarem: Kimihito finds himself in this situation due to the increasing number of monster girls that show up and end up living with him. The fact that they fight over and seduce him constantly, and that he's not allowed to have sex with them (except the one he marries, which brings its own problems as the girls fight over that), doesn't make things any easier. Gets an extra dose of drama as he likes all of the girls and would like to marry them but is afraid to choose between them in part because, like any other caring (non-oblivious) harem protagonist, he knows that no matter who he chooses he'll still break the hearts of everyone else.
* ViralTransformation: Zombies are the result of Humans contracting an infectious disease, turning them into one. [[spoiler:This includes being bitten by a zombie or scratched by their teeth]].
* WalkingSpoiler: While Lala's existence has quickly reached ItWasHisSled territory (no thanks to [[TrailersAlwaysSpoil gracing the cover of Volume 7]]), she's still introduced fairly late in the story, and a lot of important reveals are tied directly to her.
* WeaksauceWeakness: 4/7 of the girls can't stand being in cold temperatures.
** Suu, being made of slime, freezes solid.
** Miia is cold-blooded, so she goes into hibernation/gets sleepy.
** Mero's body is actually resistant to cold ''temperatures'', but also produces liquids to keep her constantly hydrated. This means that for her, being in cold air is like the chill humans get when they go from water to air.
** Rachnee's body slows down as well. (Similarly, she can't stand heat either.)
* WeightWoe: The [[AllThereInTheManual profiles]] for some of the larger girls ("larger" referring to their overall body size, not fat) tends to keep their weight obscured.
* WeirdnessMagnet: Discussed by Smith in Chapter 43. She asks Centorea to keep an eye on Kimihito, because she was informed that there are three very dangerous extraspecies girls on the loose, and knowing his record they will probably be interested in him one way or the other. [[spoiler:She's right, of course.]]
* WhamEpisode: Chapter 22, [[spoiler:wherein a Dullahan sneaks up behind Kimihito and apparently ''chops his head off''. Closer inspection of the panel right before DOES reveal a notch in the scythe's blade, though. She just hooked him with it, but still...]]
** Chapter 38 [[spoiler:sees Lala befriend a dying girl, and question whether she should let her pass away or ignore the rules and save her life.]]
* WhamLine
--> [[spoiler:'''Doppel''': I didn't write a second letter.]]\\
[[spoiler:'''Lala''': You. You are on the brink of death.]]\\
[[spoiler:'''Mero's Mother''': Mero was taken by Octo...but she's not in harm's way, of course. Even if Meroune finds out the truth, everything will still proceed as planned. Yes...everything is going my way.]]
* WhatMeasureIsANonHuman: Unlike other series with similar concepts, this issue is notably unaddressed since many of the "monsters" are effectively just "HumanSubspecies". The problem they face is common human prejudice akin to different minorities rather than being alien species. This is mainly because 1) they've always existed, rather than as a fantasy introduction; [[TheMasquerade the human government has just kept them hidden]] and 2) they are effectively "human subspecies" and for the most part they act like humans with physical quirks; [[spoiler:in fact, humans and some extra-species have always reproduced together]] and the zombie extra-species is, in fact, composed of [[OurZombiesAreDifferent actual former humans anyway]].
* WireFu: When Miia and Rachnera [[HeyLetsPutOnAShow agree to help put on a show]] for Ils' failing shrine, Rachnera ties strands of her silk to Ils' body, allowing her to "fly" around the stage.
* WoundedGazelleGambit: In chapter 12, after Miia declares Kimihito off-limits to Meroune, the latter replies in kind. When he returns to the room, Mero asks him to take her back to her room because the warm air and low humidity is making it hard for her to breathe. Once they're alone, she starts asking him about not having a girlfriend, only for Miia to bring the others in wearing swimsuits to foil Mero's plan. [[spoiler:In the end, Miia's worrying was for nothing, as Mero read about ''Literature/TheLittleMermaid'', and wants a tragic love story just like that, where she falls in love with a guy who doesn't notice her despite all of her sacrifices for his sake.]]