Yukayo Toyotomi is a handsome guy, tall and slender but very cold and silent. He is the best student in the class, and the teachers love him for his seriousness, brilliant mind and quiet behavior. He has no friends and family, he doesn't talk to anyone and always sits alone. But no one knows the monstrous secret that he periodically kills people.. And if someone finds out his secret, it will be necessary to make him shut up.