Kouhei Morioka, a freelance photographer, is visiting a castle in Germany to shoot paranormal phenomena for his friend Hiromi Anzai, the publisher of an esoteric magazine. When he enters the castle, he is met by Hazuki, a little girl in a white outfit with cat ears. She expresses a strong interest in Kouhei and gives him a kiss, but instead reveals herself to be a vampire, sucks his blood, and makes him her slave. Kouhei, to to Hazuki's chagrin, remains unscathed by her bite. Hazuki, hoping to flee the castle and her possessive butler Vigo, instead pushes Kouhei to assist her. The two escape safely thanks to the assistance of his strong exorcist relative Seiji Midou. Hazuki is finally free.