Kimera Episode OVA

Strange "lifepods" have crashed in the western mountains, bringing with them supernatural beings previously found only in the realm of folk-lore and fantasy. Vampires walk the Earth, at war with Humanity an each other, driven by the most terrifying of genetic imperatives. Like wasps seeking a spider, they have come to this planet for only one purpose: to perpetuate their species.

(Source: Anime News Network)