Series by Osamu Nishi
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Buy on AmazonWelcome to Demon School! Iruma-kun 1
2023 · Osamu Nishi
Welcome to Demon School Hopeless pushover Iruma Suzuki has found himself in a devil of a predicament… His trashy parents have sold off his soul, and…
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Buy on AmazonWelcome to Demon School! Iruma-kun 2
2023 · Osamu Nishi
Comical Rendezvous Despite his best efforts to avoid attention, Iruma’s dumb luck and good nature have made him the talk of Babyls. But his unwanted…
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Buy on AmazonWelcome to Demon School! Iruma-kun 3
2023 · Osamu Nishi
A New Challenge His first-ever personal goal reached, Iruma wonders what he should set his sights on next. Fortunately, there are a whole host of…
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Buy on AmazonWelcome to Demon School! Iruma-kun 4
2023 · Osamu Nishi
Let the Party Begin The much-awaited Battler Party is finally here, and Iruma and the demons of the Magical Apparatus Research Battler are ready to…
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Buy on AmazonWelcome to Demon School! Iruma-kun 5
2023 · Osamu Nishi
Fickle Flash of Fame After stealing the show at the Battler Party with his and his friends’ fireworks, Iruma realizes to his dismay that he’s…
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Buy on AmazonWelcome to Demon School! Iruma-kun 6
2024 · Osamu Nishi
Diabolical Designs Fresh off the stage where he made his dem-dol debut, Iruma discovers an astounding new aspect to his magical ring and is caught in…
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Buy on AmazonWelcome to Demon School! Iruma-kun 7
2024 · Osamu Nishi
Introducing Irumean After Iruma makes an offhand comment about wanting to understand demons better, his trusty magical ring casts a sneaky spell to…
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Buy on AmazonWelcome to Demon School! Iruma-kun 8
2024 · Osamu Nishi
A Tricky Test The end of terminus break from classes at Babyls is right around the corner! Now, there’s only one thing standing between Iruma and…
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Buy on AmazonWelcome to Demon School! Iruma-kun 9
2024 · Osamu Nishi
Party at Walter Park After safely passing their exams, Iruma and his friends start their end of terminus break from classes with a trip to Walter…
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Buy on AmazonWelcome to Demon School! Iruma-kun 10
2024 · Osamu Nishi
Babyls Bravehearts The Six Fingers, a malicious band of demons, have summoned three magical beasts to destroy Walter Park!! But far from backing…
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Welcome to Demon School! Iruma-kun: IruMafia Edition 1
2025 · Osamu Nishi
Iruma-kun, the mob boss?! In this brand-new spinoff of the runaway hit series, Iruma is a dirt-poor but kind young boy who grows up in a ruthless…
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Welcome to Demon School! Iruma-kun: IruMafia Edition 2
2025 · Osamu Nishi
"Welcome to Demon School! Iruma-kun" is a Japanese manga series created by Osamu Nishi. The story follows a teenager who is sold by his parents to a…
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Buy on AmazonWelcome to Demon School! Iruma-kun: IruMafia Edition 3
2026 · Osamu Nishi
Blast from the Past Working hard to be the best underboss he can be, Iruma convinces his Nonno and Kalego to let him follow up on intel about a…
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Buy on AmazonWelcome to Demon School! Iruma-kun: IruMafia Edition 4
2026 · Osamu Nishi
Iruma’s next challenge: go undercover at a black market auction?! Shocking news of a traitor scurrying around within the Babel mafia syndicate puts…
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Welcome to Demon School! Iruma-kun: IruMafia Edition 5📅 Expected Aug 25, 2026
Read more →Welcome to Demon School! Iruma-kun: IruMafia Edition 6📅 Expected Nov 17, 2026
Read more →Welcome to Demon School! Iruma-kun: IruMafia Edition 7📅 Expected Jan 26, 2027
Read more →Frequently asked questions
How many books has Osamu Nishi written?
We list 25 books by Osamu Nishi across 2 series, published between 2023–2026 — each shown in full reading order.
When is the next Osamu Nishi book coming out?
The next book is “Welcome to Demon School! Iruma-kun: IruMafia Edition 5”, book 5 in the series, expected Aug 25, 2026. That is the publisher's announced date and can change; this page updates when it does.
What order should I read Osamu Nishi's books?
Read each series in publication order. A good place to start is “Welcome to Demon School! Iruma-kun 1.” Open any series above for its complete numbered reading order.
Where can I buy Osamu Nishi's books?
Every title links to Amazon from its series page — see our affiliate disclosure in the footer for how that supports the site.
Reading order compiled from author/publisher guidance and verified bibliographic data. Spotted a wrong order, a missing book, or any other mistake? and we'll correct it.