Holy Knight

Also known as:  Holy Knight OVA

The OVA adaptation Holy Knight is the first anime project created by Cammot, and it's based on Maya Miyazaki's vampire-hunting manga. The "dramatic school (romantic) fantasy" centers around an ordinary orphan named Mizumura, who goes to a missionary school in Tokyo. His seemingly normal life changes when a beautiful half-Romanian girl named Lilith suddenly transfers into his school. This timid boy is actually a vampire hunter and the successor of the Romyuarudo lineage. (based on ANN synopsis)

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Producers, official website and other details: AniDB, ANN, Wiki