Welcome to Demon School! Iruma-kun has four television seasons, a spinoff airing in January 2027 and a film in production, which is enough material to make the viewing order confusing. The good news is that the main story is straightforward and runs in broadcast order with nothing to skip. Here is the full picture, including where the spinoff fits.
The short answer
Watch season one, then season two, then season three, then season four. That is the main story and it has no filler arcs to dodge or movies to slot in.
The IruMafia spinoff that starts on January 4, 2027 is separate. It retells the premise in a different setting, so it can be watched at any point, including first.
Season 1, 23 episodes
The first season aired on NHK Educational from October 5, 2019 to March 7, 2020, animated by BN Pictures. Makoto Moriwaki directed, Kazuyuki Fudeyasu handled series composition and Akimitsu Honma composed the music. Da Pump performed the opening theme "Magical Babyrinth" and Yū Serizawa sang the ending, "Debikyū."
Start here. The opening arc does the heavy lifting: Iruma Suzuki is sold to a demon by his parents, adopted as a grandson by the demon lord Sullivan, and enrolled at a school for demons where being human is a death sentence if anyone finds out. The season establishes the whole cast, including Alice Asmodeus and Clara Valac, and it ends at a natural resting point rather than a cliffhanger.
Season 2, 21 episodes
The second season ran from April 17 to September 11, 2021, with the same core staff returning. Da Pump came back for the opening, "No! No! Satisfaction!", and Amatsuki performed the ending, "Kokoro Show Time."
This is where the show settles into its rhythm. If you enjoyed season one, season two is more of the same at a slightly higher pace, and the supporting cast gets room to grow.
Season 3
The third season was announced in September 2021 and aired from October 8, 2022 to March 4, 2023. Fantastics from Exile Tribe performed the opening, "Girigiri Ride it Out," and Wednesday Campanella did the ending, "Nabe Bugyō."
Note the gap. Three and a half years passed between season two and season three, which is the longest break in the franchise's history and the reason some viewers lost track of it.
Season 4
A fourth season was announced on November 17, 2024 and aired from April 4, 2026 into late September, running two cours. Penthouse performed the opening theme, "Ichi Ni no San."
This is the most recent main-story anime and the point where the series' global audience became genuinely large, because Crunchyroll streamed it across North America, Central America, South America, Europe, Africa, Oceania, the Middle East, the CIS and India as it aired.
The film, undated
On September 27, 2026, at the DEVIL'S PARTY! 2 event in Tokyo, the franchise announced its first feature film. The promotional video confirmed the movie will tell a new story rather than retell an arc, which points to an original screenplay. There is no release date, no studio and no staff list yet.
Nothing about the film requires preparation beyond finishing the four seasons, and it will land after them in release order anyway.
Where IruMafia fits
Mairimashita! Iruma-kun if Episode of Mafia is written and drawn by hiroja, working from Osamu Nishi's characters. It restages the setup: Iruma grows up in a slum, gives his last bread to an injured stranger, and discovers the man is Don Sullivan, head of the Babyl Mafia, who adopts him as heir to a crime family.
The anime runs 12 episodes on NHK General from January 4, 2027, with Ayumu Murase, Ryōhei Kimura, Ayaka Asai, Mitsuki Saiga, Daisuke Ono and Saori Hayami all returning from the main series.
Watch it whenever. It is an alternate-universe story, not a continuation, and the January premiere makes it the easiest entry point for anyone who has been putting the series off. The jokes about how far these characters are from their usual selves will land harder with four seasons behind you, but nothing in the plot depends on that.
Where to watch
Crunchyroll carries the series, and it is the simplest legal route in most countries. In parts of Asia the show is also handled by Muse Communication, which distributes to several regional platforms. Availability for individual seasons varies by territory, so check your local Crunchyroll catalogue before assuming all four are there.
There is English-dubbed material as well. Crunchyroll added a dub for the first season and followed with one for the second in June 2021. If you prefer dubs, the later seasons are the ones to check on.
The manga, if you would rather read
Osamu Nishi launched the manga in Akita Shoten's Weekly Shōnen Champion in March 2017, and it has passed 50 collected volumes, with the 51st out in October 2026. The series and its spinoffs had over 20 million copies in circulation as of March 2026.
The IruMafia spinoff started in Bessatsu Shōnen Champion in September 2023, moved to Weekly Shōnen Champion in December 2025, and reached its ninth volume on October 7, 2026. Kodansha USA publishes it in English and released the fifth volume on August 25, 2026.
Reading order for the manga follows the same logic as the anime: main series first, spinoffs whenever. The main series is far ahead of the anime, so anyone who wants to know where the story goes has plenty of runway.
One warning about the gaps
The franchise has a habit of long pauses between seasons, and each one led to a wave of "is it cancelled" posts that turned out to be wrong. The pattern so far is a season every one to three years, with a film now in the mix. If a fifth season is not announced immediately, that is normal for this series rather than a sign of trouble.
There is also a practical upside to the gaps. Each season arrived with its cast intact, which is not guaranteed in an industry where sequel announcements can take longer than an actor's availability. Six of the main voices are returning for the spinoff in January, so the production side clearly plans to keep this group together.
If you want the same breakdown for another franchise, our Kaiju No. 8 watch order guide sorts two seasons, a side episode, a compilation film and a pile of shorts into a sequence that wastes the least of your time.
Source: Anime News Network and the anime’s official website
Featured image: Visual for the Welcome to Demon School! Iruma-kun film project, via Anime News Network.