Iruma Suzuki, a fourteen year old Japanese boy incapable of refusing polite requests, works hard to support his scumbag parents. He is suddenly kidnapped to the Netherworld by the demon Sullivan after Iruma’s parents sold his soul. Sullivan wishes to adopt Iruma as his beloved grandson, since his friends Levy and Belial always boast about their grandsons and he is jealous. Iruma agrees and is enrolled in Demon School where he must keep his human identity secret or risk being eaten by his classmates. Iruma attends opening ceremony and learns Sullivan is the schools director. First Year Representative Asmodeus Alice tries to give his speech but Sullivan makes Iruma do it instead. Iruma reads a speech provided by Sullivan, terrifying and impressing the students as the speech was actually a dangerous spell to prevent Iruma falling or embarrassing himself. Asmodeus challenges Iruma to a duel for insulting him but Iruma, having being raised by scumbag parents who constantly put him in dangerous situations, has developed an almost superhuman ability to dodge out of the way. The other students assume Iruma refuses to fight back because he considers Asmodeus weak. When a girl in the audience is almost hurt Iruma saves her, but the effects of Sullivans spell prevents him falling forwards and he accidentally knocks Asmodeus unconscious by throwing him backwards in a German Suplex. The story spreads throughout the school, making Iruma famous. Iruma is shocked when Asmodeus happily declares himself Iruma's servant. Sullivan is delighted Iruma seems to have a bright future in the Netherworld.