When Kusumi Chiharu is unexpectedly chosen as a Monster Tamer, he picks his first companion. Initially dismissing the selection, his casual attitude shifts when a massive package arrives the next day. Anticipating adult material, he is surprised to find a scantily clad, unconscious ghoul named Zonmi inside. She declares herself as his fighting partner. To his amazement, he discovers that several attractive girls at his predominantly male school are also supernatural beings vying to team up with him, complicating his newfound role.