Bloody Kiss (Yagami Rina)

From Chibi Manga: Wakaba has no memories about her first love… The only thing she keeps from her first love was A matching pendant. One day, the vampire of rumors, Yukito, came into Her school. And he has the same pendant as her?! Wakaba is sure that Yukito is her first love Just after telling him, he kissed her. But why is he so cold with her after that?!