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The story follows Iruma Suzuki, a 14-year-old human boy who is sold to a demon by his lazy, selfish and neglectful parents. The demon, known as Sullivan, takes Iruma to the Demon World and officially adopts him as his grandson. He enrolls Iruma in the Babyls School for Demons where he is the headmaster and where Iruma quickly befriends the demons Alice Asmodeus and Clara Valac.
