Ranze belong to a different kind of family than the one you would think. Her mother is a werewolf and her father is a vampire. As the story opens, Ranze is a normal school girl, falling in love with the bad-boy in class, Shun, and fighting against the rich, yakuza-parented classmate, Yoko. However, one day, she bites her classmate and turns into an exact copy of her! Ranze's parents are very happy their daughter has some powers, and they show her a whole new dimension attached to the normal one. Of course, problems have only started...