When Kusumi Chiharu is unexpectedly chosen as a Monster Tamer, he picks his first companion without much thought. His casual attitude changes when a massive package arrives the next day, not filled with the expected books but with an unconscious, scantily clad ghoul named Zonmi. She declares herself as his battling partner, setting off a chain of events where he discovers that more enchanting female classmates at his predominantly male school are mystical beings too, vying to join forces with him.