Welcome to Demon School! Iruma-kun: IruMafia Edition

In this new spinoff, Iruma is a poor but kind boy growing up in a harsh city slum. One day, he gives his last loaf of bread to a badly injured old man and nurses him back to health, only to learn that the old man is Don Sullivan, the leader of the Babel Mafia. Soon after, Don Sullivan returns, takes Iruma away, and begs the boy to become his grandson. Just like that, the curtain rises on Iruma's chaotic new life as the next in line to a massive gang of, you could say, demonic mafiosos.