The overly kind-hearted boy Suzuki Iruma, who can never say no to a request, ends up becoming the grandson of the great demon Sullivan through a strange turn of events! Doted on endlessly, Iruma enrolls at the demon school Babyls, where Sullivan serves as the chairman... While still bewildered, Iruma enjoys a fun school life with Asmodeus, Clara, and his classmates. However, just as he thought he was getting used to the demon world, further tribulations befall him! The ring starts talking, and Iruma... goes delinquent!? Iruma's tumultuous demon school life continues on and on!