A beautiful transfer student, Hitode Rokishima, clad in a jet-black sailor suit, arrives in a classroom where one after another, the dead are "beheaded" by flying ski boards, steel doors in the subway, and crashing traffic lights. The only way to save the cursed high school students is to sacrifice one of them. I told you, didn't I?　Is the enigmatic girl friend or foe? Envy and fear, love and hatred are all mixed up in this horror story of school suspense.