Vampires

I watched an anime series the other night about vampires. It was about a girl whose family consisted of vampires. She, on the other hand, has a disorder where she has massive nosebleeds, and she injects the blood into her victims before she has the bleedouts. Her blood multiplies and she is constantly embarrassed because of her disorder. She meets a human boy who, for some strange reason, causes her blood to multiply twice as fast as it usually does. They end up becoming friends, but she has many nosebleeds in front of him. Eventually, she starts liking this boy, but she cannot tell him her secret or her family will kill him. It is an interesting story and it led to me thinking about a reversal in roles where there is a couple, one of them hunting vampires for a living and the other being a vampire.