As a member of the Mysterious Discovery Club, one day Shibaki Kota summons a witch using a witch summoning manual he stumbled upon in the library. He jokingly asks for girls' panties. Rurumo is summoned, and delivers Shibaki what he'd wished for. However, he had no idea having his wish granted meant creating a contract with a witch and giving her his life. When Rurumo appears again, Shibaki receives 666 magic tickets from her that allow him to freely use magic...