Iruma Suzuki has always been eager to please, even at the cost of his well-being. Worst yet, he's the son of two selfish parents who end up selling him to a demon. Thanks to their totally irresponsible actions, Iruma has found himself living in the Netherworld, where he must live and attend school as the grandson of an older demon. Luckily, his new, doting grandfather is there to help, but Iruma will have to figure out how to blend in with his demonic classmates or risk getting eaten. All he needs to do is subjugate rival classmates, summon familiars, and do other typical demon things while never revealing that he's human… Piece of cake, right?

Suzuki Iruma has just been abandoned and sold to a demon by his irresponsible parents! Surprisingly, the next thing he knows he's living with the demon who has adopted him as his new grandson, and has been transferred into a school in the demon world where his new "demon" grandfather works as the principal. Thus begins the cowardly Iruma-kun's extraordinary school life among the otherworldly as he faces his true self, takes on challenges, and rises to become someone great...

The second season of Mairimashita! Iruma-kun. 
 
Suzuki Iruma, human and deeply non-aggressive, one day becomes the grandson of the great demon Sullivan. Doted on beyond belief, Iruma starts school where "Grandpa" serves as the chair... and finds, to his surprise, that he enjoys life there with Asmodeus, Clara, and the rest of his demon classmates. But just when Iruma thought he'd fitted in, there's more trouble ahead! A ring begins to talk, and Iruma... goes bad?! Iruma's chaotic, demonic life at school continues! 
 
(Source: NHK)

A spin-off of Mairimashita! Iruma-kun made in collaboration with the Youtube/Nico Nico Douga group ○○ no Shuyaku wa Wareware da!
 
The story follows Shaoron, a freshman at Babyls who wants to join the Student Council and become popular.

An official Mairimashita! Iruma-kun anthology series, featuring stories of Iruma Suzuki and his friends as students of Babyls Demon School.

Years before he became one of the most feared teachers at Babyls, Kalego Naberius was himself a student at the school for demons, dealing with a very big problem. For some reason, his schoolmates keep mistaking him for the shadowy figure picking off unruly students one by one—and trying to pay him back for the beatings. Not the type to sit and wait, Kalego and his classmate Balam start searching for the real culprit, only to find themselves in a cat-and-mouse game of demonic proportions…!
 
(Source: Kodansha USA)

The third season of Mairimashita! Iruma-kun. 
 
This time it's the jungle! 
 
Human boy Suzuki Iruma becomes "grandson" to the great demon Sullivan and begins attending demon school where "Grandpa" serves as chairman. Winning friends -- and rising in demon rank, too -- Iruma thrives in his new environment, overcoming the harrowing ordeals thrown his way! In the new season, further challenges await... it's harvest season, and time for the annual test where students wade into the expansive and extremely dangerous (!) jungle to compete for food!! Classmates become rivals, and what erupts is a gargantuan battle of brawn and wits? 
 
(Source: NHK)

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 city slum. One day, Iruma gives a severely injured old man his last loaf of bread and nurses the stranger back to health—only to find out that the elder gent is none other than Don Sullivan, leader of the Babel Mafia! Soon after, Don Sullivan comes back, whisks Iruma away, and begs the boy to become his grandson. And just like that, the curtains rise on Iruma’s chaotic new life as the next in line to a gigantic gang of—dare we say—demonic mafiosos!
 
(Source: Kodansha USA)
 
Note: 2nd place in the Tsugimanga 2024 Award in the Print Manga Category.

The fourth season of Mairimashita! Iruma-kun.
 
Suzuki Iruma and all thirteen students of the Misfit Class must perform to reach Rank 4 at the Music Festival. 
(Source: Crunchyroll News)

A spin-off manga featuring Iruma Suzuki, Shax Lead, and Soi Purson - the three of which make up the titular "Boku Alliance" - as they play various Netherworld video games.

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