Now here is a favorite anime of mine.
Miyu is a vampire, beautiful, young teenager. Not only is she a young vampire, but she also has to get rid of evil Shimna and return them to the darkness. She is assisted by her only slave, Larva. Larva is actually very beautiful but in the OVA, he's not allowed to speak nor take the mask off. In the TV episodes you et to hear his voice and face more. But Larva and Miyu share a very close relationship.
There are four OVA episodes and 26 TV episodes. I like both of them, personally.