Tsukiyo no Hitomi wa Kurenai ni

Masato is a sophomore student in Kaori high school. He confesses to the girl of his interest, but gets rejected. In grief he occasionally breaks the seal of a shrine and releases vampire Kiko. She is hungry for human blood, but Masato sees a cute little girl in her and eagerly gives away blood. Later he notices he can use special abilities. He wanders around the town in search for assistance and new love...

[From vndbreview]