The Iruma-kun mafia spinoff has a date. The official website for Welcome to Demon School! Iruma-kun: IruMafia Edition opened on October 27, 2026 and confirmed a January 4 premiere on NHK General at 11:00 p.m. JST, a 12-episode run, and a main visual showing the cast redrawn as gangsters.
The site also posted character visuals for six actors returning from the main series.
The returning cast
- Ayumu Murase as Iruma
- Mitsuki Saiga as Opera
- Daisuke Ono as Naberius Calegro
- Ryōhei Kimura as Asmodeus Alice
- Ayaka Asai as Valac Clara
- Saori Hayami as Amelie
Every name on that list voiced the same character in the main anime, so the spinoff is keeping its cast rather than recasting for the alternate setting. No studio or director has been announced for the spinoff yet, which is the biggest gap left in the production details.
What IruMafia actually is
The full Japanese title is Mairimashita! Iruma-kun if Episode of Mafia, an "if" story written and drawn by hiroja under Osamu Nishi's supervision. It is not an adaptation of the main manga and it does not follow the school story. Iruma grows up poor in a city slum, gives his last loaf of bread to an injured old man, and nurses him back to health. The old man turns out to be Don Sullivan, head of the Babyl Mafia, who returns, takes Iruma home and asks the boy to become his grandson. Iruma's new life is as the next in line to run a demon crime family.
Kodansha USA publishes it in English and put out the fifth volume on August 25, 2026. Akita Shoten released the ninth Japanese volume on October 7, 2026. The manga started in Bessatsu Shōnen Champion in September 2023 and moved to Weekly Shōnen Champion in December 2025, which is a promotion rather than a demotion: the parent magazine has a far larger circulation than the monthly spinoff book.
It also placed second in the print category of the 10th Next Manga Awards, a reader-voted ranking that has a decent record of picking series before they break big.
One detail worth noticing
The main Iruma-kun anime airs on NHK Educational, the public broadcaster's school-age channel. IruMafia is going out on NHK General at eleven at night. That is a different slot, a different audience and a different tone of scheduling. A mafia story with a shonen cast fits a late-night general-audience slot better than an educational channel, and NHK moving the franchise there for a spinoff says something about how the broadcaster sees the material.
Where this sits in the franchise
Nishi launched the manga in Weekly Shōnen Champion in March 2017. The first anime season ran 23 episodes from October 2019 to March 2020, the second ran 21 episodes in 2021, the third ran from October 2022 to March 2023, and a fourth season aired from April 4, 2026 through late September. On September 27, 2026, at the DEVIL'S PARTY! 2 event, the franchise announced its first feature film, with a promotional video confirming a brand-new story rather than a retelling.
So IruMafia arrives into a franchise that already has four TV seasons, a film in production and a running parent manga with more than 50 collected volumes. January 4 puts it in the winter 2027 season, roughly three months after the fourth season ended.
Why the spinoff matters more than most
Spinoffs of hit shonen comedies usually exist to keep a property warm between seasons. IruMafia looks like it is doing something slightly different. The manga has run long enough to build its own readership, it moved up to the flagship magazine, and it earned an award nomination on its own merits rather than on the parent series' name recognition. That is the profile of a spinoff that a publisher believes can stand alone.
For viewers, the practical question is whether they need four seasons of homework first. They do not. IruMafia restages the premise from scratch, with Sullivan as a mafia don instead of a demon school headmaster, so the twelve episodes should work as a starting point. Reading the main series first will make the character jokes land harder, since the spinoff leans on how far these people are from their usual selves.
What is still unknown
The studio, the director, the theme songs and the international streaming arrangement have not been announced. Given that the main anime's fourth season streamed on Crunchyroll worldwide, a similar deal for the spinoff is likely but unconfirmed. The January 4 date is a little over two months away, so those details should arrive soon.
Source: Anime News Network, citing the anime’s official website
Featured image: Main visual for Welcome to Demon School! Iruma-kun: IruMafia Edition, via Anime News Network.
