Welcome to Demon School! Iruma-kun
Welcome to Demon School! Iruma-kun is a popular Japanese fantasy-comedy manga series written and illustrated by Osamu Nishi. The story follows Iruma Suzuki, a kind-hearted 14-year-old human boy who is sold by his incredibly irresponsible parents to a powerful demon named Lord Sullivan. Rather than torturing him, Sullivan dotes on Iruma as his new adoptive grandson and enrolls him into the prestigious Babyls Demon School, forcing Iruma to navigate supernatural challenges while keeping his human identity a secret.
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Core Premise
The core premise of Welcome to Demon School! Iruma-kun revolves around a kind-hearted, 14-year-old human boy named Iruma Suzuki, whose path crosses with the supernatural when his exceptionally irresponsible parents sell his soul to a powerful demon named Sullivan.
Instead of tormenting or eating him, Sullivan desperately wants a grandson to dote on, so he officially adopts Iruma and enrolls him in the prestigious Babyls Demon School. Iruma must navigate everyday school life and supernatural challenges while desperately hiding the fact that he is a human from classmates who would gladly eat him if they found out.
Despite his intense desire to blend in, Iruma’s extreme dodging reflexes (developed from surviving his parents' neglect) and a series of monumental misunderstandings constantly thrust him into the spotlight, accidentally earning him massive reputation, powerful rivalries, and deep loyalties among the demon students.
As the narrative progresses, it evolves from a pure slice-of-life fantasy comedy into a deeper journey of self-growth, moving from a traumatized child learning to adapt, toward a natural leader positioned to fulfill prophecies regarding the next Demon King.
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Key Themes
Welcome to Demon School! Iruma-kun operates as a wholesome, vibrant, and uplifting subversion of traditional shonen tropes. At its core, the series focuses on the power of desire, the subversion of morality, and finding belonging through empathy. The narrative uses its supernatural Netherworld setting to explore deep human truths through several distinct thematic layers.
The Power and Embracing of "Desire": In the human world, Iruma’s pathological selflessness and complete inability to say "no" stems from years of trauma, neglect, and survival instincts. However, once he is enrolled in the Babyls Demon School, the narrative shifts to highlight desire as a positive, driving force. Magic and progression in the demon world are explicitly fueled by what a person genuinely wants. Iruma's character arc centers heavily on learning how to form his own ambitions, move past a baseline survival mindset, and unapologetically pursue what makes him happy.
Subversion of Morality: The series uniquely flips the script on what are traditionally considered "negative" traits. In the demon realm selfishness, greed, and pride are treated as healthy mechanisms for self-actualization and personal growth. Conversely, excessive selflessness, like Iruma’s initial tendency to sacrifice his own comfort for others, is framed as a detriment he must actively overcome.
The Evil Cycle: When demons undergo high stress, they experience an "evil cycle" where their darkest impulses take over. The show contrasts mindless, destructive chaos (pushed by villains like Baal) against structured outlets like school festivals and clubs, which channel demonic desires productively.
Choosing Found Family and True Belonging: Despite being an abandoned human teenager sold to a demon, Iruma finds genuine warmth in the Netherworld. His adoptive grandfather, Sullivan, provides unconditional love and a sense of safety Iruma never experienced with his biological parents. The Misfit Class functions like a tightly-knit, found-family unit where eccentric and cast-aside demons find a collective identity and mutual protection.
Radical Empathy over Confrontation: While it features competitive demon rankings and magic battles, Iruma’s greatest strength is his radical kindness. He consistently disarms rivals, such as Alice Asmodeus and Clara Valac, not through intimidation or physical violence, but through nobility, shared fun, and a willingness to understand them. He teaches characters like Clara that they are worthy of friendship simply for who they are, rather than what they can provide or summon with their magic.
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Characters
The massive cast of Welcome to Demon School! Iruma-kun revolves around Iruma Suzuki, a human boy sold to a demon who must navigate life at the Babyls Demon School. The characters are primarily organized by their classes, school faculty status, and positions within the broader Netherworld hierarchy.
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The Misfit Class (Problem Children)
Iruma Suzuki: Adopted by a powerful demon after being sold by his neglectful parents, he relies on his extreme survival reflexes and the Ring of Gluttony to pass as a demon. Despite wanting to blend in, his endless kindness and massive appetite constantly draw everyone's attention and respect.
Alice Asmodeus: Originally Iruma’s rival, he became fiercely loyal after losing a duel to him on the very first day of school. He is a top-tier student specializing in powerful fire magic who views himself as Iruma's right-hand man and ultimate protector.
Clara Valac: A chaotic and hyperactive girl, she uses her family's bloodline ability to pull absolutely anything she has seen out of her magical pockets. Though other demons initially found her annoying, she quickly became Iruma's best friend and loves playing wild games with him.
Sabnock Sabro: Driven by a dream to become the next Demon King, he possesses a massive, muscular frame and a deep respect for prophecies. His bloodline ability allows him to forge powerful weapons instantly out of any metal he bites into.
Keroli Crocell (Kuromu): She maintains a quiet, top-student persona at school to hide her massive secret identity as the Netherworld's top pop idol, Kuromu. She uses ice and water magic, though her body is prone to overheating when she pushes her idol performance energy too far.
Lied Shax: A passionate gamer and slacker, he shares a brotherly bond with Iruma over games, snacks, and getting into trouble. His "Controller" bloodline magic gives him the ability to steal and manipulate the physical senses of his targets.
Jazz M. Andro: Growing up under a strict older brother made him a master pickpocket who can steal items effortlessly without his targets ever noticing. His bloodline ability, "Pit," allows him to see right through an opponent's clothes to scan whatever items they are carrying.
Agares Picero: This perpetually sleepy demon prefers to spend his school days napping on a floating, comfortable cloud mattress while wearing an eye mask. When forced to fight, his bloodline ability grants him absolute control over the earth, allowing him to reshape the ground at will.
Camui Caim: Looking like an anthropomorphic owl in formal attire, he is a chivalrous gentleman who unfortunately lets his perverted impulses get the best of him. His unique bloodline ability lets him communicate fluently with any living creature, making him an excellent strategist.
Allocer Schneider: Sporting a regal, lion-like head, he is the undisputed academic genius of the Misfit Class and always ranks at the top of written exams. He relies heavily on logic, possesses a vast knowledge of Netherworld history, and can see through illusions.
Elizabetta Ix: A tall, gorgeous student who radiates mature charm and firmly believes that pure love wins over any battlefield. Her bloodline magic releases a sweet scent that captivates and hypnotizes any male demon within her immediate radius.
Goemon Gaap: Styled exactly like a traditional samurai with thick hair completely obscuring his face, he follows a strict code of honor and friendship. He wields a specialized katana and utilizes wind-based bloodline magic to slash through opposing spells and physical obstacles.
Purson Soi: He spent his early school days completely unnoticed because his family's bloodline magic actively erases their physical presence and sound from everyone's awareness. He is an exceptionally talented trumpet player who eventually steps out of the shadows to save his class during a major musical festival.
Babyls Faculty and Guardians
Sullivan: As one of the Three Great Demons ruling the Netherworld, he has a terrifyingly vast amount of magical power but acts like a goofy, doting grandfather at home. He loves spoiling Iruma with gifts, affection, and fancy meals to make up for the boy's tragic childhood.
Opera: Serving as Sullivan's cat-eared, stoic butler, they manage the entire household with terrifying efficiency and a completely deadpan expression. Despite their polite demeanor, they are a legendary fighter whose sheer physical combat strength strikes fear into the faculty.
Naberius Kalego: He is an intensely strict, brooding teacher who values discipline above all else and absolutely detests rowdy students. Due to a magical mishap with a summoning ritual, he becomes bound as Iruma’s personal familiar in the form of a fluffy, harmless bird.
Balam Shichiro: A gentle giant covered in thick hair, his intimidating appearance hides a sweet nature and a profound love for all living things and mythical creatures. He teaches imaginary biology and becomes one of the few trusted adults who helps protect Iruma's human secret.
Robin Bars: An incredibly upbeat, young teacher who serves as Kalego's enthusiastic assistant and always tries his best to stay positive. He belongs to the famous Bars clan of archers, giving him a bloodline ability that guarantees his arrows will never miss their target.
Student Council and Other Notable Characters
Ameri Azazel: The commanding and tall Student Council President who rules the student body with an iron fist and immense physical strength. She harbors a secret obsession with illegal human romance manga, leading her to rely on Iruma to translate the stories for her.
Eiko: A lovable background student who accidentally gets saved by Iruma during the school's opening ceremony and instantly becomes his biggest fan. She spends most of her time desperately trying to find the courage to talk to him or taking photos of his antics from afar.
Kiriwo Amy: An upperclassman who initially appears as a frail, weak student running the Magical Apparatus Battler with a malfunctioning barrier ability. It is later revealed that he is a twisted sadist who gets genuine joy from watching other people fall into despair.
The Antagonists and The Demon Reformation
Baal (Thunder Lord): A highly influential member of the Thirteen Crowns who secretly serves as the overarching mastermind plotting to overthrow the current peaceful Netherworld. He wishes to return demon society to its primeval roots of raw chaos, destruction, and survival of the fittest.
Kiriwo Amy: An upperclassman who initially appears as a frail, weak student running the Magical Apparatus Battler with a malfunctioning barrier ability. In reality, he is a twisted, sadistic terrorist working under Baal who derives extreme, genuine euphoria from watching others fall into despair.
Atori: A highly dangerous and unpredictable spider demon who is a member of the villainous group known as the Six Fingers. He manages to infiltrate the Babyls teaching staff as a mole, hiding a feral, bloodthirsty nature beneath a deceptively quirky personality.
Shiida: Another member of the Six Fingers who infiltrates Babyls as a temporary teacher during the Royal One and Harvest Festival arcs. Unlike her ruthless companions, she shows a soft spot for Iruma and actively protects him during high-stakes crises.
Naberius Narnia: The older brother of Kalego who serves as a high-ranking commander in the Demon Border Patrol. He eventually aligns himself with Baal’s faction, using his vast institutional authority to manipulate events behind the scenes.
Ocho: A small, deceptive student from a rival school who acts as a spy during the Harvest Festival arc. He specializes in sound-gathering magic and manipulation, serving as a direct scout for Kiriwo and Baal's faction.
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