7.6/10
Welcome to Demon School! Iruma-kun—known in Japan as Mairimashita! Iruma-kun—is one of those rare anime series that quietly builds a loyal fanbase before suddenly becoming impossible to ignore. What initially looks like a simple comedy about a human boy attending a school full of demons quickly evolves into something much bigger: a heartfelt coming-of-age story, an unexpectedly emotional fantasy adventure, and one of the most consistently enjoyable school anime of the last decade.
Created by Osamu Nishi, the series first appeared as a manga in 2017 before receiving an anime adaptation in 2019. Since then, it has grown into a major franchise with multiple anime seasons, manga spin-offs, millions of copies sold, and now a highly anticipated fourth season in 2026.
By March 2026, the manga and its spin-offs had surpassed 20 million copies in circulation, showing just how much this once-underestimated series has grown.
So what exactly makes Iruma-kun so special… and why are so many anime fans calling Season 4 the biggest one yet?
Welcome to Demon School! Iruma-kun – Official Trailer
What Is Welcome to Demon School! Iruma-kun About?
The story follows Iruma Suzuki, a kind-hearted but extremely unlucky human boy. Due to his irresponsible parents, he is literally sold to a demon.
That demon, Sullivan, does something unexpected… he adopts Iruma as his grandson and enrolls him in a prestigious demon academy known as Babyls.
The problem?
Iruma must hide the fact that he is human at all costs—because if demons find out, he could be eaten.
Instead of keeping a low profile, Iruma accidentally becomes one of the most popular and admired students in the entire school, constantly getting involved in chaotic situations, competitions, and friendships.
Main Characters
Iruma Suzuki
Iruma is the heart of the story. Despite his difficult upbringing, he remains kind, selfless, and incredibly adaptable. His ability to survive extreme situations ironically helps him thrive in the Demon World.
Alice Asmodeus
A powerful and intelligent demon who becomes fiercely loyal to Iruma after being defeated by him. Calm and composed, but very emotional when it comes to Iruma.
Clara Valac
One of the most chaotic and energetic characters in anime. Clara brings nonstop comedy, but also develops meaningful friendships with Iruma and Asmodeus.
Ameri Azazel
The strong and respected student council president. She suspects Iruma’s true identity early on and develops a close bond with him.
Sullivan
The Demon World elite who adopts Iruma. Powerful, eccentric, and overly affectionate, he plays a huge role in Iruma’s rise within demon society.
Anime Seasons Overview (Including Season 4 Focus)
Season 1 (2019–2020)
The first season introduces the world, characters, and Iruma’s struggle to adapt to demon life. It focuses heavily on comedy, friendships, and school life.
Season 2 (2021)
This season expands the world and gives more depth to the supporting cast. It introduces stronger emotional moments and character development.
Season 3 (2022–2023)
Season 3 raises the stakes with training arcs, competitions, and major character growth. It begins to show Iruma’s ambition and evolving identity.
Season 4 (2026 – Current Focus)
Season 4, which premiered in April 2026, marks one of the most important turning points in the series.
This season continues to:
- Develop Iruma’s rise in demon ranks
- Expand political and social dynamics of the Demon World
- Introduce more serious challenges and threats
- Focus on Iruma’s role in shaping the future
While still comedic, Season 4 leans more into long-term storytelling and character progression, making it one of the most anticipated parts of the anime so far.
Why Is Iruma-kun So Popular?
A Unique Twist on the “School Anime” Formula
Instead of a typical human school setting, the series takes place in a demon academy filled with magical abilities, strange rules, and unpredictable characters.
Balance Between Comedy and Emotion
The show is extremely funny, but it also delivers meaningful character development and emotional moments without feeling heavy or forced.
Lovable Characters
Nearly every character, even side characters, feels memorable and important. The relationships between them are one of the biggest strengths of the series.
Continuous Growth
Unlike many long-running anime, Iruma-kun consistently evolves. Each season builds on the last, making the story feel rewarding over time.
Is Welcome to Demon School! Iruma-kun Worth Watching?
Absolutely.
If you enjoy anime that mixes humor, fantasy, and character-driven storytelling, this series is an excellent choice. It’s easy to watch, highly entertaining, and surprisingly meaningful as it progresses.
It’s especially great for viewers who want something lighter than typical battle-heavy anime but still packed with growth and world-building.
Frequently Asked Questions
Is Iruma-kun still ongoing?
Yes, both the manga and anime are ongoing, with Season 4 currently airing in 2026.
How many seasons are there?
There are four seasons so far, with additional spin-offs and adaptations planned.
Is there a Season 5 confirmed?
No official confirmation yet, but based on popularity, future seasons are highly likely.
What genre is Iruma-kun?
Comedy, fantasy, school, and slice-of-life with light action elements.
Is it similar to other anime?
It shares some elements with school anime and isekai, but its tone and humor make it stand out as something unique.
Conclusion
Welcome to Demon School! Iruma-kun continues to prove that a simple concept—one human boy in a demon school—can grow into something much bigger.
With its mix of comedy, heartfelt storytelling, and gradual character development, the series has become a fan favorite across multiple seasons.
And with Season 4 pushing the story forward in 2026, this is one anime that keeps improving with time—making it well worth watching, whether you’re just starting or already a fan.
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