A schoolgirl is found dead by a fellow student. He notices two teeth marks on her neck and sees another girl fleeing the scene. He convinces himself that the killer is obviously a vampire and the girl who ran away surly must be the killer. To his surprise, the girl (Miyu) turns out to be his new classmate...

After beginning her new school life at Tokiwa Gakuen, Miyu befriends classmates Chisato, Yukari and Hisae. When another student, Yuko, tells them about her brother, who seems to be suffering from bizarre nightmares since an ancient African mask was brought home, Miyu visits Yuko's house and immediately recognizes the mask to be a Shinma.