A 14-year-old selfish but adorable vampire, Hazuki was separated from her mother and restrained in a castle in Germany. She escapes the castle with Kouhei's help and flees to Japan in search of her mother. A vampire's "kiss", the act of drawing blood from a mortal, normally turns the mortal into the feeding vampire's unwilling servant, but Hazuki's attempt on Kouhei fails. According to the storyline, Kouhei is narrated as the "Vampire Lover", and therefore is immune to the binding power of Hazuki's vampiric "kiss".
Source from Wikipeida