Hitode Tateshima, a beautiful transfer student wearing a jet-black sailor suit, arrives at a classroom where many people have been decapitated by skis flying in the air, iron subway doors, and crashing traffic lights. The only way to save the cursed high school students is to sacrifice one of them. ``I told you, right? Hitode-chan is a hitorless girl. Is this mysterious girl an enemy or an ally? A terrifying school suspense horror where envy and fear, love and hate mix together.