The wait is almost over for fans of the beloved demon world comedy. Welcome to Demon School! Iruma-kun Season 4 has dropped its main trailer, and it comes packed with exciting updates. The new promo video not only showcases the opening theme song but also confirms a major new voice actor joining the cast.
The fourth season is scheduled to premiere in Japan on April 4, 2026, bringing back the chaotic and heartwarming adventures of Iruma Suzuki and his classmates at Babyls Demon School. With a run of 24 episodes, this new season will cover the highly anticipated Music Festival arc, promising plenty of music, teamwork, and emotional moments.
Main Trailer Reveals Penthouse Opening Theme and April Premiere
The official main promotional video, released on March 14, 2026, gives fans their best look yet at what the new season will offer . The trailer is set to the catchy opening theme song titled “Ichi Ni no San” (One, Two and Three) , performed by the Japanese band Penthouse .
Shintaro Namioka, the vocalist and guitarist of Penthouse, shared his thoughts about the song on the anime’s official website. He explained that the band aimed to capture the unique blend of comedy and heartfelt moments that defines the series . He described the track as one that makes people want to get up and dance, sitting somewhere between cool and lively .
The trailer also confirms that the series will maintain its high production values. Makoto Moriwaki, who directed previous seasons, is stepping up as chief director for Season 4, with Ayaka Tsujihashi taking on the director role . Bandai Namco Pictures is once again handling the animation production, ensuring consistency in the art style and character designs that fans have come to love .
Takehito Koyasu Joins Cast as Amduscias Poro
Alongside the trailer release, the production team announced that veteran voice actor Takehito Koyasu is joining the cast . Koyasu, known for his iconic roles across decades of anime, will voice Amduscias Poro, a character affectionately referred to as “Poro-chan” by the staff .
Koyasu expressed his excitement about joining the series, commenting on the character’s design and role in the upcoming arc . He described Poro as a “cool and cute powerhouse” who is set to shine during the Music Festival arc . His enthusiasm for the role was clear when he stated, “I love Poro-chan so much,” building anticipation for how this new character will interact with Iruma and the rest of the Abnormal Class .
Setsuo Ito Finally Voices Purson Soi After Six-Year Wait
One of the most talked-about casting announcements for Season 4 actually came earlier in January 2026, but it remains a major talking point as the premiere approaches. The character Purson Soi, a classmate of Iruma who has been present in the anime since the first season without dialogue, finally received a voice actor .
Setsuo Ito, famous for voicing Shigeo Kageyama in Mob Psycho 100, has been cast as the long-silent classmate . Purson Soi belongs to a family whose creed is to “absolutely avoid standing out.” His special ability blocks his presence to the point where even his classmates forget he exists . For years, he remained completely unnoticed and silent in the classroom.
However, the Music Festival arc forces him into the spotlight due to his exceptional trumpet talent. The character PV released in January gave fans the first listen to his voice, which surprised many . Contrary to his quiet image, when Purson finally speaks, he unleashes an intense, rapid-fire barrage of dialogue that overwhelms Iruma .
Ito shared his feelings about landing the role, admitting that seeing the excitement around the teaser PV brought both joy and pressure . He recalled feeling dizzy when he first opened the script due to the sheer volume of dialogue. Despite the challenge, he expressed his determination to give each line his full effort alongside Purson Soi as a member of the Abnormal Class .
Music Festival Arc Takes Center Stage in Season 4
The upcoming season will adapt the Music Festival arc from Osamu Nishi’s original manga . This storyline focuses on the entire Abnormal Class coming together to compete in a major school event. The festival tests not just musical talent but the unity and cooperation of each class.
The main visual for Season 4, released earlier, highlights this theme by showing the thirteen students of the Abnormal Class in dazzling stage costumes under bright lights . For Iruma and his friends, winning the Music Festival means getting their long-forgotten classmate, Purson Soi, to join them on stage. The arc explores how Soi, who has lived his entire life by the creed of never standing out, responds to Iruma’s sincere invitation .
Season 4 Release Date and Episode Count
Welcome to Demon School! Iruma-kun Season 4 will begin broadcasting in Japan on NHK Educational on April 4, 2026, at 6:25 pm JST . Streaming within Japan will start on April 6 at 6:00 pm JST .
The season will consist of 24 episodes, running for two consecutive cours (quarters of a year) without a break . This means fans can expect six straight months of new episodes, allowing the Music Festival arc to be adapted fully without interruption.
For international audiences, Crunchyroll has confirmed they will stream the series as it airs in Japan . The streaming availability covers a massive territory including North America, Central America, South America, Europe, Africa, Oceania, the Middle East, the CIS countries, and India . This wide release ensures that global fans can watch new episodes shortly after their Japanese broadcast.
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Event Celebration and Manga Legacy
To celebrate the upcoming season, a special one-day commemorative event is scheduled for March 14, 2026, at Theater 1010 in Japan . The event features appearances by main cast members including Ayumu Murase (Iruma Suzuki), Ryohei Kimura (Alice Asmodeus), and Ayaka Asai (Clara Valac) . Original manga creator Osamu Nishi will also make a special appearance, sharing behind-the-scenes stories and production anecdotes .
The Welcome to Demon School! Iruma-kun manga, written and illustrated by Osamu Nishi, has been serialized in Akita Shoten’s Weekly Shลnen Champion since March 2017 . It has released over 47 volumes in Japan and continues to grow in popularity . Kodansha USA publishes the English version of the manga, making it accessible to readers worldwide .
The anime first premiered in October 2019, followed by its second season in April 2021 and third in October 2022 . All previous seasons are currently streaming on Crunchyroll, with both subtitled and dubbed versions available .
The story follows Suzuki Iruma, a 14-year-old human boy whose parents sell him to a demon. Fortunately, the demon Sullivan has always wanted a grandson and dotes on Iruma, enrolling him in Babyls Demon School . Iruma must keep his human identity a secret while navigating challenges, making friends, and slowly winning over classmates with his innate kindness .
With new cast members, a full 24-episode run, and the emotional Music Festival arc ahead, Welcome to Demon School! Iruma-kun Season 4 is shaping up to be the biggest season yet for fans of this charming demon world comedy.
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