The popular anime series Welcome to Demon School! Iruma-kun (Mairimashita! Iruma-kun) is preparing for its highly anticipated fourth season. The new installment will premiere on April 4, 2026, airing on NHK Educational at 6:25 p.m. JST. This marks a return to the chaotic and heartwarming adventures in the Netherworld, where human teenager Suzuki Iruma continues to navigate life among demons while keeping his true origins a secret.
The fourth season will span two consecutive cours, totaling 24 episodes for an extended half-year broadcast run. This format allows for deeper exploration of ongoing story arcs, character development, and the signature blend of comedy, action, and school-life elements that have defined the series since its debut.
The opening theme song for the season, titled Ichi Ni no San (一二の三), will be performed by the Japanese band Penthouse. Known for their energetic and catchy style, Penthouse brings a fresh musical vibe to accompany Iruma's latest escapades at Babyls Demon School.
The announcement was made through the official website and social media accounts of Welcome to Demon School! Iruma-kun, with additional coverage provided by Comic Natalie. Earlier reveals included a first trailer and new key visual released in late 2025, building excitement among viewers by showcasing glimpses of familiar characters and teasing new challenges ahead.
Produced by BN Pictures (formerly known as Bandai Namco Pictures in some contexts), the anime has maintained consistent quality across its previous seasons, adapting Osamu Nishi's manga with vibrant animation, humorous timing, and faithful storytelling. The series has built a strong following thanks to its relatable protagonist and eccentric cast of demon classmates and faculty.
What is Welcome to Demon School! Iruma-kun about?
Welcome to Demon School! Iruma-kun is based on the manga series by Osamu Nishi, which began serialization in Akita Shoten's Weekly Shōnen Champion in March 2017. As of early 2026, it has amassed over 47 collected tankōbon volumes, continuing to deliver new chapters that expand the world of demons, magic, and misadventures. Nishi's work stands out in the shōnen genre for its lighthearted tone, inventive world-building, and themes of kindness triumphing over adversity. The series has also spawned spin-offs, including side stories focused on supporting characters like the strict teacher Kalego.
The story follows a human boy thrust into the demonic world. Here's Crunchyroll's description of Welcome to Demon School! Iruma-kun:
Suzuki Iruma, human, 14, one day finds himself taken against his will into the world of demons. To add to his predicament, his doting owner and self-appointed 'Grandpa' is the chair-demon at his new school. In order to survive, Iruma must deal with a haughty student who challenges him to a duel, a girl with adjustment issues, and so many more scary beings! Can this ultimate pacifist dodge the slings and arrows that are flung his way? As he struggles frantically, Iruma's innate kindness begins to win over enemies.
At its core, the series combines fantasy comedy with coming-of-age elements. Iruma, an overly kind and conflict-averse teenager, is sold by his irresponsible parents to a powerful demon named Sullivan, who adopts him as his grandson. Enrolled in the prestigious Babyls Demon School, Iruma must hide his humanity while excelling in demonic studies, participating in school events, and forming unlikely friendships. The narrative highlights themes of acceptance, growth through challenges, and the power of empathy in a world that values strength and hierarchy.
Previous seasons have covered Iruma's early school days, rank promotions, high-stakes competitions like the Harvest Festival, and deeper lore about demon society. Season 4 is expected to continue adapting key manga arcs, introducing more intense conflicts and character backstories while preserving the show's signature humor.
The first three seasons of the anime are available for streaming on Crunchyroll, where fans can catch up on Iruma's journey ahead of the new season's debut.
Sources: Official website and accounts of Welcome to Demon School! Iruma-kun, Comic Natalie.
