Ojou-sama wa Mazo

Kentaro is an unlucky boy. One day, he is hit by a car. He seriously gets injured and loses consciousness. When he regains his consciousness, he finds himself being in the bed. A maid girl, Fumi, comes to him and tells him what happened.... He was hit by a car that Maya, a vampire girl, drove and taken to her house. And she gave some blood of her to him and saved him. Maya says, "You're now my slave. Live with me, become my husband, and we should make babies." He doesn't know what's going on, but he accepts it....