Welcome to Demon-School! Iruma-kun

Iruma Suzuki arrives at the mansion of the great demon Sullivan, who then proceeds to adopt him as his grandson and enrols him at Babyls School for Demons.

Iruma and his fellow students are taught how to summon familiars, which will establish their rank and what class they're placed in.

Iruma and Asmodeus encounter a rather strange girl named Valac Clara; Iruma becomes closer to both Asmodeus and Clara.

Iruma, Asmodeus, and Clara end up in the Misfit Class, which, as the name suggests, is full of misfits.

The Misfit Class is in the middle of a flying race in order to determine their ranks, but since Iruma is human, he can't fly.

Iruma is still doing everything he can to not stand out at school, but an incident occurs in class involving the Gluttonous Feeder ring.