Fifteen-year-old Ranze Etou leads a life typical for a girl her age, with one major exception: she lives in a castle with a vampire father and a werewolf mother who are constantly concerned about her lack of powers. On her first day at a new school, Ranze meets the handsome Shun Makabe and falls deeply in love with him. Although he remains unaware of her feelings, this does not prevent Yoko Kamiya, the daughter of a yakuza boss, from becoming jealous. Additionally, Ranze's parents strongly disapprove of the idea of her dating a human. To make matters worse, Ranze must deal with the emergence of a new ability—the power to shapeshift into anything she bites!