Mizumura Shinta is a plain undergraduate student. One day, he meets a transfer student from Romania, Kishimoto Lilith. She is a half human and half vampire. Through the life with Lilith, he knows the secret of his birth. He is the sole descendant of the Romuald clan, the vampire hunters.
Shinta discovers that he is the last in a long line of vampire slayers and Lilith, a vampire, must conceive a child with the slayer and then kill them both and bathe in their blood in order to live on.
Shinta is an ordinary student. One day she meets a student from Romania who is half human and half vampire. She is called Lilith Kishimoto. Living with her, he soon discovers the secret of her birth. He is the only descendant of the Romuald clan and thus a vampire hunter.