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Welcome to Demon School! Iruma-kun (original Japanese title: 魔入りました!入間くん, Mairimashita! Iruma-kun), is a weekly shonen manga by Osamu Nishi. It runs in the Weekly Shōnen Champion magazine published by Akita Shoten, and began its serialization on March 2, 2017.

Iruma Suzuki is a sweet, normal boy whose irresponsible parents have led him time and again into life-threatening events. And this time, they've gone and sold his soul to a demon!... who wants to adopt him as his grandson and send him off to a school full of demons! Now, Iruma must try to get through school without anyone finding out that he's a human!

An anime adaptation by Bandai Namco Pictures began airing on October 5, 2019, the first season of which ran for 23 episodes. A second season was confirmed to be in production on September 2, 2020, and eventually began airing on April 17, 2021.

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On January 9, 2020, a spin-off manga called We are the Main Characters of the Demon World! started its serialization in the same magazine.

A manga anthology, titled After School! Iruma-kun (放課後の!入間くん, Houkago no! Iruma-kun), began its serialization on November 6, 2020 in Akita Shoten's Monthly Princess magazine.

On April 15, 2021, another spin-off titled Welcome to Demon School! Iruma-kun - Kalego Side Story (魔入りました!入間くん カルエゴ外伝, Mairimashita! Iruma-kun Kalego Gaiden) began its serialization alongside the main series. Much like the title suggests, the story focuses on Iruma's homeroom teacher Kalego Naberius during his time as a student in Babyls Demon School.


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Welcome to Demon School! Iruma-kun contains examples of:

    #-M 
  • 13 Is Unlucky:
    • There are 13 members of the Misfit Class.
    • The meeting of the greatest demons of the Netherworld is called the 13 Dinner. Said demons are collectively known as the "Thirteen Crowns".
    • One year in the Netherworld consists of 13 months and the last month only has 13 days in it. Kiriwo's birthday falls on the thirteenth day of the thirteenth month.
    • Kiriwo Amy's prison number is 1313.
  • Absurdly Powerful Student Council: Subverted. They do have a lot of influence over the faculty, which is how Iruma was able to get permission slips from several teachers, however they are also still seen as another student group and are subjected to the same rules as them.
  • Abusive Parents:
    • Iruma's parents were both horrible and selfish people who literally had him act as their slave from the moment he could walk, and made him work various dangerous jobs despite him being underage for most of it. They eventually took this to an extreme level by remorselessly selling his soul to Sullivan without his knowledge. Granted, this did actually became a real improvement to Iruma's life, but the abuse and neglect they placed upon him had a major impact on him both emotionally and mentally.
    • When it was discovered that Kiriwo Amy barely had any magic in him, his entire family immediately shunned him for this as they viewed this as a disgrace to their family name. When the boy spotted his mother among them, he ran to her for comfort. However, she coldly shoved him away from her while ordering her relatives to take him to a school that was known as the Garden of Delinquents.
  • Actor Allusion:
  • Adaptation Deviation: Starting from Episode 8, the anime changes up the ordering of some of the chapters it adapts. Episode 8 in particular moves the events of Chapter 17 to the middle of Chapter 13. Because this episode takes place before the Cannonball Execution Game, Iruma took Classroom Lectures as an Elective as to not stand out rather than because his body was sore.
  • Adaptation Expansion: Has its own page here.
  • Adults Are Useless: The various adult humans from Iruma's previous life were even worse than useless, as not only did they do nothing to help with or stop his Abusive Parents, they apparently either weren't aware in the first place or corrupt enough to be manipulated or paid to turn a blind eye. Conversely, in a rather ironic case, every single example of adult demons who aren't members of villainous groups are extremely competent and helpful, not only doing everything they can to make sure Iruma and the rest of the demonic children are protected and well-educated, but also are for the most part pretty good at it, with only a few slip-ups here and there, and even then it's simply a case of the villains being good at trickery and sneakiness rather than any negligence or corruption on the heroic demons' part.
  • Alien Sky: It was never focused on before, but in chapter 140, when Iruma is just standing around looking up at the sky during the night pondering his life in the Netherworld, it's shown in one panel that the Netherworld has two moons, one big and one small.
  • All Girls Want Bad Boys: When Iruma gets his personality flipped from nice to bad, the girls at the school suddenly gain crushes on him.
  • Alliterative Name: While not universal, a decently large number of characters in the story have both their given name and surname start with either the same letter or the same sound. Examples include (both alphatically and grouped by surname):
    • Alice and Amaryllis Asmodeus.
    • Ameri Azazel.
    • Bachiko Barbatos.
    • Blushenko Buer
    • Kamui Caim.
    • Kerori Crocell.
    • Dali Dantalion.
    • Goemon Garp.
    • Grave Sunny Gusion.
    • Quichelight Kimaris.
    • March and Mar Marbas.
    • Momonoki Morax.
    • Oswell Orias
    • Lomiere/Romiere and Rosevelt Ronove.
    • Sabro and Silvia Sabnock. (Taken further with Sabro Sabnock.)
    • Shakky Shax (Shakusu).
    • Suzy Stolas.
  • Altar Diplomacy: Many girls have considered asking out Iruma because he is Sullivan's grandson.
  • Always Chaotic Evil: Played With. Demons seem to have a strong natural inclination to do evil, but pretty much everything about their society is set up to turn them into more-or-less decent people. But even then, Babyls still offers courses in torture techniques.
  • Arbitrary Skepticism:
    • Only high ranking demons are even aware of the human realm. Due to this, most of the students think that humans are just a myth. Which is a bit odd since their School Song is pretty much just about how they will devour humans.
    • No one believes Iruma when he states his ring became sentient.
  • Amusement Park: There's Walter Park, owned by the Ronove family, which has almost everything one could expect from such a place, from attractions, to snacks, to gift shops. It does have shades of Amusement Park of Doom, however, as the source of magical power to operate the whole park is provided by prisoners held in a prison located underneath, along with the place originally being built as somewhere for demons to vent their "wicked phases", with various shady and illegal businesses continuing to operate out of back alleys there.
  • Ars Goetia: Many character names and their abilities are based off the demonic lore of Ars Goetia, which the author has mentioned as inspiration during interviews.
  • As Long as It Sounds Foreign: Beyond basing the ranking system on the first ten letters of the alphabet, none of the Hebrew script actually means anything.
  • Attention Deficit... Ooh, Shiny!: While this is exhibited the most in the Valac family, it's eventually revealed that all demons at bare minimum exhibit a downplayed case of this. If something doesn't interest them enough to keep focused on it, it will be borderline impossible for them to spend more than a day or two trying before dropping it and doing something else. This combined with the additional inherent Lack of Empathy also makes trying to perform as a group basically a lost cause.
  • Author Appeal: All of the most attractive girls in this series are also noticeably tall.
  • Badass Boast: Elizabetta gives one on behalf of the Misfit Class to Amduscias, one of the judges of the Music Festical.
    "Amduscias-sama, we appreciate your concern, but there is no need for you to worry. We're going to pierce you with the finest sound."
  • Bait-and-Switch:
    • Following being sold by his parents to Sullivan, it looked like something terrible would happen to Iruma. Cut to the next scene, and he's sitting on a chair surrounded by gifts being pampered with a look of utter confusion on his face.
    • Ameri knows that Humans exist because she states she has access to ancient Human Texts. In the Anime this is shown to be a wall of books surrounded by light, suggesting that these are some powerful artifacts. Once she opens it up its revealed the books are actually a romance manga.
    • Amy wondered what caused a strange feeling in his chest every time he was looked down upon and shunned, and didn't figure it out until he saw his childhood friend lose her most precious item. He discovered he was actually feeling ecstasy and was getting off on the misery.
    • Sabnock sees there is a Demon King's club and rushes to join, thinking this would be a club filled with people looking to become Demon King. What he finds is a group of nerds who use the club to study the writings of the Demon King. However, Sabnock quickly becomes engrossed into the writings and joins anyway.
  • Better Off with the Bad Guys: The story starts with fourteen year-old Iruma being sold to the devil by his own deadbeat parents and brought to Hell. Fortunately, all said devil wants is a grandson to show off to his friends and Iruma starts to live a life of luxury. He stops trying to go back to the human world when he remembers how his parents stole anything he produced and made him live in the wilderness.
  • Blatant Lies:
    • Despite his clothes showing he had to ruff up some people, Azz states he only "peacefully talked" to get others to leave Clara alone. Iruma doesn't buy it.
    • Ameri didn't take the Manga because she enjoys it, she took it because she needed to study it.
    • Ameri isn't making Iruma read her manga because she wants him to, she is having him read it to confirm he is a human. Also she won't be able to confirm it till he reads her the entire series. She is just being thorough.
  • Brick Joke:
    • The reason why Sullivan wanted a grandkid is because his friends keep bragging about theirs and it made him jealous. Later on during their meeting, his friends start it off by gushing about their grandchildren.
    • In Chapter 181, Lied assembles a class meeting about how to get closer to Elizabetta causing Azz to suggest to Iruma that they leave after just getting there. At the end of the chapter when Lied calls another class meeting on what his first message to her should be, Azz once again suggests to Iruma they leave.
    • After the Harvest Festival, Iruma and Lied hang out at Lied's apartment to play videogames. It comes to light that they both consider the other to be like a little brother to them, which makes them argue over who really is the little brother. Many chapters later at Iruma's birthday, Lied reveals that his birthday is in September, a month before Iruma's, which definitely makes him the older brother.
  • Call a Rabbit a "Smeerp": Due to the Demon World being completely isolated from the human world for countless generations, and the fact demons overall favor a heavy "evil" aesthetic, there are many mundane objects and activities that wind up getting called something scary and/or overly-dramatic, such as referring to the game of dodgeball as "Cannon Ball Execution".
  • Call-Back: At the beginning of the Music Festival arc, Soi Purson is properly introduced to the reader (and to the rest of the Misfit class) with Kalego pointing him out from the middle of the group. At the end of the arc, after being accepted as one of their own by the class (and after being the showstopper that wins the festival), the final page has a reversal of that shot, with Kalego pointing out that the rest of the class is standing right next to him, with all of them taking off their enchanted glasses at the same time. They are even in the exact same formation.
  • Cast of Snowflakes: Almost everybody in the story has a distinctive design, from the main characters to incidental background demons. Many of them are so distinct that they're still recognizable when acting as part of Faceless Masses.
  • Chekhov's Gag:
    • In Chapter 6, Iruma learns how his human blood can be used as a healing agent and enhancer to materials in the Demon World. During the Harvest Festival, he uses his blood to enhance a vine plant that will help him escape from a deep chasm. It turns the vine into a towering plant that is taller than the previously largest trees by several magnitudes.
    • Iruma's ability to read Hatsukoi Memory, and having worked on it when back on Earth, at first is just a reason for the start of his friendship with Ameri, but during the Harvest Festival his encyclopedic knowledge of the series allows him to retell it to Thoth the Genie, who guards the Seed of Beginning and requires being told something that moves his heart and is funny. Thoth is so moved, he gives the Seed to Iruma.
    • Ameri keeps on running into Iruma being Dragged into Drag, so she's well aware of Iruma's secret identity right when Team Kuromu needs a replacement idol who's already up to speed with the team's secret identities.
  • Chekhov's Gun: On day 1 of the Harvest Festival, Misfit student Schneider Allocer works with Jazz to get points by disguising himself as a faculty member setting up a fake submission point for people to drop their goods off at. On the fourth and final day after Koko Orobas has stolen the special plant pot needed to grow the legendary leaf from Lied, Allocer sets up another fake submission station and Koko falls for it, giving Allocer back the item, and allowing him to give the pot to Iruma. And again when it turns out that Orobas collected so many high-value items that not even the Legendary Leaf's massive point value is enough to bring Iruma and Lied to victory. It's pointed out that the pot is still a separate item from the Leaf even if the Leaf was planted in it, and thus has its own value to bring them over the top.
  • Comically Missing the Point: Due to their cultural differences, Iruma's demonic friends and schoolmates often interpret his actions and words as shows of strength and him flexing his great demonic powers, which isn't helped by his Achievements in Ignorance. Even when he's not doing anything in particular, such as walking to school instead of flying as he has no innate magical powers, that could still be misconstrued as him willfully limiting himself to challenge his own strength.
  • Crash-Into Hello: How Iruma and Ameri first meet, mirroring a scene from her shoujo manga. Because she can't actually read them she suspected it's a human love spell and believed Iruma was trying to make her fall in love with him.
  • Crazy-Prepared: Parodied when Iruma was getting ready for Walter Park. He and Sullivan prepared a backpack for everything Iruma might need, which is shown to be a backpack filled so much its twice the height and about four times as wide as Iruma. Opera objects to Iruma taking it.
  • Crouching Moron, Hidden Badass: Sullivan's two peers are likely on the same level of power and threat as him. They are also loving doting grandparents who spend much of their important meeting sharing stories of their grandkids.
  • Curb-Stomp Battle: In the Walter Park arc, Kalego, Balam, and Opera face down a fusion of the three giant monsters. The former two demons are rank 8, and while Opera's rank is unknown they still are capable of terrifying Kalego. The battle is over in swift course when the three take the beast on. Their students and Iruma wonder if just one would have yielded the same easy result.
  • Cute Monster Girl: While they may be demons, all the female students and teachers definitely count as this, and the ED even focuses on them. A number of the male demon characters could also potentially qualify as Cute Monster Boys.
  • Custom Uniform: Many students who have unusual body proportions wear these, though some atypical ones just wears them to suit their tastes.
  • Deal with the Devil: The whole plot gets kicked off when Iruma's irresponsible parents sell him off to Sullivan for money.
  • Demoted to Extra: This is invoked in-universe by Kerori in the Music Festival arc. While Iruma is a great dancer, she puts him on the music team with Soi because if Iruma dances, he will draw attention to himself and away from others. They need the whole class to succeed to raise up everyone's ranks to Rank 4. If he takes attention from them, then they will likely fail in raising everyone's rank. Moreover, Iruma is already Rank 4, so everybody else in the class has more need to draw attention to themselves than he does.
  • Didn't Think This Through:
    • Iruma had this reaction when he realized he just healed the monster that was going to eat him. Luckily this was an Androcles' Lion situation.
    • Iruma initially wants to return to the human world. When Opera tells him that he actually can return if he wishes, he starts having doubts about it, considering that he'd be giving up a guardian who actually provides for his needs, a life of luxury, and all of his new friends in exchange for his old crappy life should he return to the human world.
    • After training days on end to catch the ball for the Dodgeball game, Iruma realized during the game after he caught it he never trained on throwing it back. Luckily, he managed to do so without any problem.
    • Ronove is pissed that the monster (who has just destroyed the theme park and is charging a beam to obliterate the survivors) is not focused on him and demands it to look at him. He then remembers that this monster is about to obliterate a stadium and is now looking in his direction.
  • Early-Bird Cameo:
    • In the anime, Clara's family and Kerori grandmother can be seeing in a crowd shot in Episode 1.
    • During Baliard and Levy's first appearances, they are showing off pictures of their grandsons. The photos aren't quite focused on, but you can make out certain details about their appearances. It's not until almost 200 chapters later that they (the grandsons) are properly introduced.
  • Early Installment Weirdness: Initially, it's treated as though humans are common knowledge within the Demon World, even if they don't really exist within it. Babyls' school song is all about eating humans even. But later, on it's revealed that humans are considered fictional creatures by most and that it's a deeply held secret that there is any other world besides the Demon one within demon society.
  • Epic Fail:
    • Iruma, at the beginning, tried whatever he could to either get less noticed or get expelled from the school, as he was terrified at the thought of being discovered and eaten. However, everything he tries always backfires to make him even more noticed by the staff and the students.
    • Clara's attempts at "seducing". This is because she is so childlike that she took all of her instructions with a Literal-Minded approach (told to wear perfume so she dunks it on herself, told to wear makeup so she looks like a clown, told to dress up so she gets a prop costume, told to hold onto a guy so she hangs on him.)
  • Everyone Has Standards:
    • They may be demons, but even the group he was in were creeped out by how much Amy got off on misery, even if it was his own.
    • Even Bachiko is shocked upon learning what Iruma's parents had done to him and shows concerns for his well-being.
  • Exact Words: When Iruma was made to give a speech on opening day, Sullivan gave him one with a note saying this is so he won't "trip and fall on you're first day". After reading it one of the teachers tells him it was a forbidden spell that if said incorrectly would have blown him apart, but since he said it correctly it will prevent him from tripping or falling for the entire day.
  • Explain, Explain... Oh, Crap!: Iruma has this happen to him after he bumps into Ameri and sees her copy of a Manga. He starts explaining how it brings back memories, states he can read it, and wonders what a copy of it is doing in the Netherworld. Its at this point he realized he all but told the demon in front of him he was a human.
  • Extranormal Institute: Babyls is a school for Demons. Besides the student body it actually acts like a normal school.
  • Failed a Spot Check: During the race, Azz didn't notice that Clara was riding on his back since the start until she started talking. Because of this she got second place.
  • Fantastic Flora: It appears Strawberries can run.
  • Fictional Currency: The Netherworld uses a currency called "Vills".
  • Floating Continent: All of the land masses in the Netherworld are these.
  • Foreshadowing:
    • Iruma's ring keeps causing him to grab Amy by the throat. It is later revealed by Arikured that he was doing that to warn Iruma that he was a Bitch in Sheep's Clothing.
    • During the Kuromu Arc, Iruma started figuring out that Kuromu was in fact his classmate Kerori when he noticed that both Kerori and Kuromu had a habit of hiding their thumbs inside their fists (followed up with the more obvious clues like Kerori's glasses, schedule book, ice magic, etc.). This foreshadowed Iruma's Awesome by Analysis ability, which is better shown in the Royal One's Arc.
  • Forgotten Birthday: In chapter 182, it is revealed that Iruma's birthday is October 4th, which at this point in the story that was 21 days ago.
  • Freeze-Frame Bonus: If you pay attention to the middle part of the anime's opening, you can see a cream-colored cat floating. Said cat is Osamu Nishi's Author Avatar. Purson can also be seen in the background in the same time frame.
  • Funny Background Event: During the Walter Park arc, Opera and Ameri are fighting a giant dragon while Clara is seen hanging onto its tail in the background like it is a ride.
  • Got Volunteered:
    • Kalego suffers this from the Principal:
      • In chapter 68, he is forced to make home visits and give his assessments to the parents or guardians of each of his students.
      • In chapter 69 he is forced to be an escort of Iruma and his friends at Walter Park.
    • After the Magic Item Research Club is temporarily disbanded, Ameri made Iruma become a member of the Student Council.
  • G-Rated Drug:
    • In chapter 163, Balam created a strength enhancing medicine for Iruma that had the side effect of lightheadedness for a short period of time. It turns out the medicine was so strong that Iruma ended up drunk.
    • During the Misfit Class' gathering in chapter 198, Lied brought a bottle of "Relax Juice", which seems to be a substitute for alcohol that's safe for consumption by kids. Unfortunately, Lied didn't know that the juice needed to be diluted in water before drinking, so everyone (including himself) ended up getting high anyway.
  • Hoist by His Own Petard: Kalego, as a familiar, demands Iruma to undo the summoning. Robin stops him from doing so by citing the school guidelines "be dignified and never allow specific exemptions". The person who wrote said guideline was Kalego himself.
  • Hypocritical Humor: Ameri states if you wish to cause a ruckus, "DO IT QUIETLY!".
  • Internal Reveal:
    • It isn't until Ch.19 of the manga/Ep.12 of the anime that Iruma finds out Ameri is the Student Council President.
    • Chapter 64 has Iruma tell Balam that he is a human.
    • In chapter 142, Baal, Kiriwo, and Ocho learn that he's a human from a bug planted on his clothes.
    • In chapter 146, Sullivan and Opera tell Bachiko that Iruma's a human.
    • In Chapter 184 Kerori reveals to Lied that she and Iruma are Kuromu and Irumi.
  • Interspecies Romance: There are quite a number of girls who either are romantically pining after Iruma or at least find him cute. All of whom are demons while he's human. Of course, besides Ameri, who is aware he might be a human but doesn't know for certain, most of them think he's a demon, so it doesn't come to mind for the majority of them. But Iruma is very much aware that he's not the same species as any of the girls around him, even if he's not aware some of them like him that way.
  • Irony: Within the demon world, glasses tend to have a very different purpose. Instead of being used to see better, they tend to be used (with enchantments) to make others see you worse. That is to say they hide you from the vision of those they are enchanted to hide you from. For instance, after saving Walter Park, Iruma is given glasses specifically designed to hide him from the paparazzi that were constantly hounding him for interviews.
  • Lack of Empathy:
    • Chapter 77 reveals this is a defining trait of all demons. If there is a problem that doesn't personally affect them or someone they already care about and the danger is too high, then they will not get involved. In this specific instance, only Iruma (being a human, and an All-Loving Hero with Chronic Hero Syndrome at that) acts to save some kids trapped in rubble during the Walter Park fight because of the danger of the monster near them and the area might collapse puts off even the staff of the company. Even Azz and Balam don't move until Iruma gets involded.
    • Both of Iruma's parents are incapable of feeling any sense of empathy as they had no problem making their son's life a living hell before eventually selling him to Sullivan for money.
  • Last-Second Word Swap: After witnessing Ameri take down the panther rat monster during the Walter Park arc Opera offers Ameri a job when she graduates to be their assistant but swaps to saying the principal's at the last moment.
  • Let No Crisis Go to Waste: While Kalego is stuck observing some of his students at Walter Park a terrorist attack happens and a giant minotaur-like monster is attacking near him and his students. He decides this is an excellent time for a pop quiz of sorts, and has his students see if they can defeat the beast. When they are barely successful in knocking the beast down but celebrate too soon, he moves in and effortlessly saves them, decreasing their grades for this action.
  • Letting the Air Out of the Band: During the Harvest Festival when Iruma and Lied show up with The Legendary Leaf, it is so underwhelming that there is a noticeable whoosh noise as it focuses on them.
  • Long Runner: In-Universe example. In the anime, the manga Hatsukoi Memory is shown to be hundreds of volumes long.
  • Mass "Oh, Crap!": The Misfit Class has this reaction when their tutors are looking forward to training them even harder than before.
  • Meaningful Background Event:
    • After Iruma temporarily joins the Student Council, Ameri explains how that evening's Blood Moon could awaken demons' "evil cycle" making them act feral and aggressive to other students. She briefly interrupts the explanation to roundhouse kick a demon about to devour a smaller one to establish her point, and sharp-eyed readers can catch that same demon grabbing his victim in the student-packed panel just prior.
    • In Chapter 181, a Super-Deformed Clara can be seen behind Lied as he thinks out loud about how he would like to exchange phone numbers with Elizabetta. At the end of the chapter Elizabetta looks for Lied and wants to trade phone numbers with him, stating Clara informed her about it.
  • Might as Well Not Be in Prison at All: Despite having everyone of the security forces in the room, the moment Sullivan decided he no longer wanted to be there anymore, they knew full well there was nothing they could do to stop him from leaving.
  • Missed Him by That Much: In the Volume 2 extras, Eiko is enjoying watching the flowers bloom and dreams of Iruma being with her. She fails to notice him walking up in cleaning garb and politely takes the garbage away.
  • Mood Whiplash:
    • Episode 8 has a scene that cuts frequently, in an escalating manner, between Iruma and Ameri's rather serious conversation (about Iruma deciding on a dream of his own for the first time), and Clara's battle to break in and play with Iruma while Azz frantically tries to stop her.
    • In chapter 175, After Arikured gives a heartwarming speech to Iruma about how they are bound together, Iruma points out to him he no longer appears to be attached to the ring. He immediately books it out the window, only to be slingshot back into the room.
  • Monster Is a Mommy: The Leader of Kanakiri Valley, a giant black feathery monster seen as impossible to fight against by the school, is the parent of a large bird monster Iruma heals. It's thanks to that Iruma was able to save Sabnock from getting killed.
  • Mundane Made Awesome: One of the forbidden spells, that if pronounced incorrectly, would result in the speaker having their limbs explode, makes the speaker unable to fall over for the day. It's more useful than it sounds.

    N-Z 
  • Noodle Incident: Whatever happened that resulted in Iruma facing off a bear and getting shot at by Mobsters.
  • Not Hyperbole: Early on, Clara stated her shoes have names. It seems like it's just to show off that she is a Cloudcuckoolander, but it turns out that they are actually alive, much to Iruma's shock.
  • Nothing Is Scarier: The only thing we know about Jazz's training is that he is begging to be saved.
  • Not What It Looks Like:
    • Iruma decides to practice his ring's new ability to change his outfit. It changes him into a frilly girls outfit just as Ameri walks in on him. Ameri has nightmares about it for three days straight.
    • Ameri comes across Iruma, once again in a frilly dress, on top of Kerori.
  • Number of the Beast: This series seems to try to find any way it can to insert 666 into something, even if it's accidental In-Universe.
    • The school has 666 students in all 6 grades.
    • The meeting of the three Demon Lord candidates takes place on the 666th floor.
    • In the Anime, Sullivan does an Ok sign with his three fingers curled. This is shown to represent 666.
    • Also in the Anime, the demon school started its morning assembly in Episode 1 at 6:06. It would have probably been 6:66 if it was possible for a clock to actually be at that time.
    • Azz stated he waited six hours and six minutes for Iruma on the first day of school.
    • The Battler Rookie Hunt lasts for 66 minutes.
    • Lied states that Kuromu's magnification power is 666 too much.
    • The time when Kuromu's performance is meant to start in the anime is 6:06:06.
    • Momonoki asks Clara to read the textbook from Page 66 during her class.
    • Goemon stated he bought 66 copies of Kuromu's new song.
    • Professor Balam made a picture book titled "666 Lil' Cerberus".
    • The Harvest Festival takes place over four days, or as Balam puts it, 6666 minutes.
    • Eiko managed to survive to the last day of the Harvest Festival with exactly 666 points.
    • When pointing out how boring Class A's performance idea is for the Music Festival, Ronove suggests that they sing 666 words of praises for him instead.
    • During the Misfit Class' training for the Music Festival, Kerori orders the guys (sans Iruma and Purson) to yell "I'm so cool!" 666 times as their first assignment.
    • The highest score the three judges of the Music Festival can give is 6 each, denoted by Oswell holding up three signs that combined read 666.
    • Music Festival judge Amduscias is renowned for stalling enemy troops by performing a concert for 666 hours.
    • The Misfit Class wins the Music Festival with a perfect score of 666, or rather, 66♭ (it was initially 661 but Amduscias changed his score sign from 1 to ♭).
    • The demonic currency, Vills (equivalent to Yen), are minted in denominations of 600, 60, and 6.
    • Azz's birthday falls on June 6.
    • The first event of the Evidol Games is a 66 meter sprint.
    • Meta example: the duration of the preview for the anime's second season is 66 seconds.
  • Once an Episode: Every episode of the anime has a stinger between the credits and preview. They all start with Clara saying "sukima" in varying pitches and tones, followed by short clips with simpler animation and a less-detailed art-style. Some of them are based on omakes included in the volume releases, others are anime-original, but each of them is a small scene that relates to the events of the episode they accompany in some way.
  • Our Demons Are Different: The only things every demon have in common are that they can fly with wings, use magic, and have some form of Pointy Ears, but they can differ in size ranging from the size of action figures to giants, look like anthropomorphic animals, just look plain weird, and then there are the ones who look almost exactly like humans except for their horns and/or tails. Currently the only Demon whose race has been officially stated is Prof Raim being a succubus.
  • Pointy Ears: All demons have long pointed ears, with the exact length and shape depending on the demon, which acts as a good signifying detail that differentiates the human Iruma (who has normal ears) from everybody else, no matter what form they take.
  • The Power of Blood: Iruma discovers that human blood appears to be able to heal demons.
  • Public Secret Message: Ameri tells her father that Iruma is "A Very Excellent Demon". He seems to understand what she means and leaves Iruma alone after that.
  • Pun:
    • The cellphones in this world are called Hellphones.
    • Iruma drinks Hell Grey Tea.
    • There's actully quite a few puns involving the character 魔 (read "ma"), although the Crunchyroll translation can seem like it's forcing itself to make the puns work at times (e.g. hellraiser clock = mezamashi dokei note ). For another example, in the series title the word mairu is a formal way of saying "to come" or "to go", but it uses that "ma" and a more standard way of saying "to enter" (normally read hairu, but can also be read iru).
  • Quizzical Tilt: Both Iruma and Ameri tilt their head to the side with a confused expression when Opera tells them they don't understand the concept of cooking.
    Opera: Don't tilt your heads at me!
  • Red Herring:
    • We are lead to believe the flamboyant president of the Discipline Division is the one behind Ameri's personality change as his group has the most to gain from the Student Council failing. It turns out to be just a random student who wanted to see a sweet version of Ameri.
    • It's initially suggested that Amy is going to bring down the demon world's ranking system that only values power because of mistreatment he experienced for lacking power, centered around one particular incident where he and his only friend were bullied. It's later shown that he actually wants to cause mayhem and destruction because he loves to witness others' suffering, with the previously mentioned defining incident being when he finally realized he felt ecstacy from seeing his friend miserable.
  • Religious and Mythological Theme Naming: Most of the demons' family names come straight from the Ars Goetia.
  • Remembered Too Late: Sullivan calls up Iruma to tell him he forgot to mention after he fed his ring his magic Iruma can now use magic and to not use it until he had some time to adjust the output, just seconds after Iruma jokingly used magic on his plant.
  • Running Gag:
    • In the anime Eiko keeps missing her chance to talk to Iruma.
    • Every time Kalego has to explain something, he is forced to use a very cutesy video that explains the rules. This usually ends with him destroying said screen in frustration after its done.
  • Sailor Fuku: The girls' uniform at Bablys resembles the typical Japanese sailor uniform. Most female students wear this uniform, though Ameri and Elizabetta wear Custom Uniforms that lack the sailor collar.
  • Secret Test of Character:
    • It is suggested that Kalego put Iruma and Azz on separate teams during the Cannon Ball Execution game to see if Azz would throw the game to help Iruma. Made more explicit in the anime.
    • The steps for finding the Legendary Leaf in the Harvest Festival were made deliberately confusing, convoluted and overall crazy, especially for demons, for the exact purpose of finding a demon that is almost nothing like any other demon, somebody that is relentlessly determined to accomplish what they desire, selflessly helpful towards others, and capable of taking something absurd and turning it into something fun, as they would make the perfect candidate to succeed the previous Demon King.
  • Serious Business:
    • The Three Greats take great pride in proving they have the best grandchild.
    • "The Cult of Numeral 2" is exactly what its name suggests: a bunch of demons obsessed with the number "2", to the point of worshipping it like a god. At first it sounds like a myth or rumor, with even the people that know about it doubting it's real, but later it's revealed to truly exist, with Ocho being a member. He was actually manipulating Orobas into becoming a false number 1 so that he could be a genuine number 2.
  • Shared Family Quirks: One of the reasons Kalego greatly dislikes Iruma is because he sees him as having several of the traits he can't stand that are the same as those of the Principal.
  • Shipper on Deck:
    • Almost every single person that so much as suspects Iruma and Ameri as having feelings for each other end up being very supportive of the relationship... with the notable exceptions of her father and Clara.
    • Later on, Iruma shows some support for Azz/Clara, as he teases the latter boy that he thinks they're hanging out way more than friends do usually.
  • Ship Tease:
    • It is heavily hinted that Clara and Ameri have a crush on Iruma. Confirmed with Ameri as of Chapter 52.
    • The teacher Momonoki appears to have a crush on Kalego.
  • Shout-Out:
    • Clara's slippers, Connor and Murph, are named after Connor and Murphy MacManus from The Boondock Saints.
    • In Chapter 147, Sullivan has Iruma wear so many coats he can't move, which is straight out of A Christmas Story.
  • Show Within a Show: The "forbidden text" Ameri has turns out to be a Shoujo manga called Hatsukoi Memory, which tells the story of a high school girl named Rin Hoshino and her growing relationship with the New Transfer Student Kakeru Aozora since their first encounter. Iruma used to be an assistant for the manga's author.
  • A Simple Plan: Iruma's primary goal during the beginning of the story is simply to just do whatever he can to avoid standing out (so he isn't found out to be a human and eaten.) Every single thing he does to remain incognito tends to blow up in his face and make him more and more famous among his fellow classmates at the school. By the time of the Walter Park arc, he has all but given up on trying to blend in (which is just as well, since the arc ends with him and his classmates becoming famous across the Demon World for stopping a terrorist plot), not that he actively starts looking for fame by any means.
  • Social Services Does Not Exist: The whole plot of the series would've turn out very differently if someone had discovered the abuse and cruelty Iruma was forced to endure under his parents.
  • The Sociopath: While it's revealed that most of the demons in the setting suffer a Lack of Empathy towards other demons that they don't care about personally, there are a few character who exhibit cases of genuine socipathy.
    • Amy Kirio appears to be a weak demon boy who befriends Iruma and his friends but is in truth a manipulative sadomasochist who got off on despair whether it be others or his own. He conspired with Baal to trap the student body with his barrier magic the ultimate plan being to detonate a bomb to kill all the students and in that ensuing chaos, the students' families would be driven back to their primal states. Amy explains to Iruma that he became aware of his sadomasochism when he was sent to a rehabilitation school due to his low magical abilities and it was there he befriended a girl who loaned him her prized earring. When he accidentally destroyed it when trying to retrieve it from two bullies, he got a nosebleed from the sight of his former friend's grieving face.
    • Baal, one of the Thirteen Crowns of the Netherworld who had grown bored with the current state of the Netherworld and masterminded the attempted bombing of the demon school so that it would send the Netherworld back to its days of chaos.
    • Despite being humans, Iruma's parents were literally incapable of feeling any sense of compassion towards others or remorse about their horrible actions, especially when it involved Iruma himself. Hell, Iruma admits that them selling him to a literal demon was very much in-character for them.
  • Speaking Simlish: Implied. Demons cannot understand human speech and vice versa, and until Sullivan applied a translation spell onto him all Iruma hears is gibberish. Everybody speaks perfect Japanese for the sake of Translation Convention, however, up to and including using standard lingo and slangs.
  • Spell My Name with an "S":
    • The name of the Hogwarts Expy that Iruma and co. attend could be read as "Babyls", "Babirus", "Babyrus" and "Babylus". The anime for the most part goes with the first one, while the manga uses them interchangeably depending on who's translating that day.
    • The name demons give to clubs can be translated as Battra, Battler, and Batora. Like with the school name, the anime mostly sticks with the first one, while the manga uses whatever the current translator of the chapter decided to translate it as.
  • Stating the Simple Solution;
    • Azz and Clara are upset they have no idea where Iruma just randomly leaves (To go read a manga to Ameri). Sabro just tells them to follow him and find out. Azz is against it but Clara immediately heads off to do just that.
    • When Iruma and Lied are trying to figure out how to grow the Legendary Leaf, Nafra simply waters it.
  • The Stinger: While most of the episodes have a version of this in the form of the SuKiMa shorts, episode 23, the Season 1 finale, ends on a genuine stinger, with it showing Iruma waking up in his "wicked phase", giving us a Sequel Hook for what's to come in Season 2.
  • Suplex Finisher: Due to a spell that makes it impossible for Iruma to fall down for one day, he accidentally defeats Asmodeus with a perfect German Suplex. This is how he ended up becoming friends with Azz.
  • Sure, Let's Go with That: During the Harvest Festival, Iruma and Lied spend the entire first day simply acclimating themselves to the forest and eating food without getting any points. The next day, Lied assumes that this was part of Iruma's plan to be well rested to go after the legendary plant that gives the most points. Iruma actually just got too caught up in making food to remember to actually go find stuff for points, so after a moment of shock he just says that yes, that was his plan all along.
  • Surprisingly Realistic Outcome:
    • Many wonder how Sullivan has a grandson when he doesn't even have children.
    • Despite Iruma finding out the Cannon Ball Execution game was just Dodgeball, it's still played by demons who have enough strength to make the game quite lethal.
    • The Student Council is treated the same as any other club. If their ability to perform their duties falters they can be suspended just like the rest of them.
    • Sullivan grants Iruma the ability to read the language of demons, but Iruma still lacks the understanding of concepts and terms that others grew up in, such as discussing potential yield of a magical attack while in battle.
  • Sympathy for the Devil: Despite Amy nearly blowing up the school, a rather deplorable action, Iruma still thinks the guy deserves credit for the clubs victory with their firework project. Though in this case it's probably less about sympathy and more about acknowledging and stating facts and giving credit where credit is due.
  • Take Off Your Clothes: Ameri orders Iruma to do this. It takes a second for Ameri to realize what she said and she clarifies she doesn't want him in his Student Council Uniform when he reads her the next chapter of her Shoujo manga.
  • Tertiary Sexual Characteristics: Most demons have the same tail shape that's only differentiated between genders (heart-shaped tips for female demons and arrowhead-shaped tips for male demons), although there are a few notable exceptions (e.g. Professor Suzy's sprout-like tail).
  • That Was Not a Dream: At the end of the Evidol Games Arc, Iruma wakes up thinking the entire arc was a very weird dream. He is horrified to find out it actually happened.
  • This Is Gonna Suck: Kalego had this reaction when Sullivan instructed him to visit the parents of his students. Turns into a Screw This, I'm Outta Here! when he goes to Clara's house.
  • Tower of Babel: The 13 Dinner takes place at a large tower named Babel.
  • Translator Microbes: Sullivan uses his magic to allow Iruma to read and understand the demon language.
  • Training from Hell:
    • Iruma does this with Opera to prepare himself for the Cannonball Execution Game.
    • Ameri puts her Student Council members, including Iruma, through this everyday as a morning exercise.
    • The Misfit Class goes through this in preparation for the Harvest Festival.
  • The Un-Reveal: The performances of classes D and E for the Music Festival were never shown. This is possibly justified on Class D's part as they are more relevant in the spinoff manga.
  • Visual Pun: in the anime OP, there's a couple of shots of Azz, Iruma and Clara dancing against a disco background - if you look at their hands, they all have every finger curled in except their pinky and forefinger, which is often called devil's horns!
  • Vitriolic Best Buds: Azz tends to tolerate Clara because Iruma likes her rather than because he himself does. The two of them are polar opposites and often bicker over Clara's antics. The narration notes that, after they bonded by trying to cook for Iruma, their number of conflicts increase.
  • Wham Line: "SO IT'S YOU" spoken by the Missing Demon King to Iruma.
  • What Is This Thing You Call "Love"?: On a more platonic level, the Demon World has no word for the concept of "friendship". Early in the story, Iruma explains the concept to Azz, and then much later on Azz explains it to the rest of the class, though more, uh, dramatically. When Iruma clears up any misconceptions created by Azz's explaination, the class all realize the term is appropriate.
    • Garp has the goal of making 100 allies. But we see that really he just wants friends, but as all other demons, he doesn't have the proper word for it, so ally is the closest he finds.
  • Willfully Weak: What Azz thinks Iruma is doing where he prefers to walk to school rather than fly.
  • Worth It: Both Sabnock and Iruma were disqualified from the race from going out of bounds, but Sabnock states it was worth it for the reaction he got from the teacher when they returned on the back of the Leader of Kanakiri Valley.
  • Worthy Opponent: Sabnock thinks of this towards Iruma after he saved him from the Leader of Kanakiri Valley.
  • Year Inside, Hour Outside: It's implied that time in the demon world moves at a much faster rate than in the mundane. At least in the manga, Ameri's stash of "Forbidden Books" was noted to be a hand-me-down from prior generations of her lineage, while Iruma claims it's only been a few years old as he was one of the assistants of the author. It should be noted however that it appears to be a very long series judging by the book shelf space it takes up in volumes and going off of similar long manga series it's not a surprise if it has been running for close to 2 decades.

Alternative Title(s): Mairimashita Iruma Kun, Welcome To Demon School Iruma Kun

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