Marie is trapped in a horrible situation. She's being constantly tormented by her classmates and regularly molested by her teacher. With nowhere else to turn, she finds herself asking for supernatural help from one of the seven demons of the seven mysteries of her school. All she desires is the death of her cruel classmates and teacher. How far will Marie be willing to go in order to achieve the murders that would free her from her living hell?

Four Netherworld Princesses have come to the human world; witch Uma, vampiress Pachira, werewolf Liru, and android Aiko. But they know nothing about human life and their mistakes make up their daily adventures. Meanwhile, the evil Dr. K-ko wants proof of the supernatural to gain admittance into the scientific elite and what better than one, or all, of the princesses—if her plans didn't have a tendency to go awry.