The stage is set in the modern world. Suzuki Iruma, a 14-year-boy, is unable to refuse a request from anyone, was sold to a demon by his parents who never worked.

What a surprising start. But Iruma-Kun forgave his parents’ such an inhuman deed. Because he was never able to refuse a request from anyone.

Iruma-Kun said good-bye with the current life and his parents, and came to the Demon World with the demon.

What is his life going to be like…… The demon said to Iruma-Kun,

Actually, the demon, Sullivan, was extremely influential and rich but he had really wanted to have a human grandkid, wanted to cherish him/her and wanted them to call him “Granpa!!!”.

Of course, Iruma-Kun accepted it.

Sullivan cherished such an honest and good Iruma-Kun so much and had him go to school, where he belonged to as the chief director.

But again, the school wasn’t the regular one where people usually go because it was in the Demon World……

It was a prestigious school, called the Babyls School for Demons, where only various elite demon kids could go.

Plus, people at the school think humans are their enemies so the human Iruma-Kun got scared. What if the fact that I’m a human was revealed……? He got so uneasy about it but one day, the chief director, Sullivan, introduced him to all the students at school and said he was his grandson!

Now he gets so much attention from all the students. One day, one of the super elite demon, Asmodeus Alice, offered Iruma-Kun a fight! Iruma-Kun is going to be okay in the demon school……!?