Academy student Taki Minase finds a magic book in the abandoned basement of his school. He translates the occult writings and uses the ancient magic spells to influence the sexual desires of his classmates, making the beautiful girl Rika Shiraki fall in love with him. School nurse Reika Kitami hears about his magical exploits and tries to sway Minase to her cause by possessing him with a demon. Twelve years ago on Walpurgis Night, Kitami herself was used as a human sacrifice by an occult magic club of students. However, the ritual failed and Kitami was forced to make a deal with the Devil to save her life. Now the contract and her time are running out. She searches the school for a suitable virgin girl to use as a vessel for her soul