Blood Lad, Vol. 1

The vampire Staz is one of the most powerful district bosses in the
demon world, fending off everyone who dares challenge him. But secretly,
the fearsome Staz is obsessed with human culture, especially video
games, manga, and everything that comes from Japan! When a Japanese girl
wanders into the demon world, Staz can't wait to meet the human and
learn everything he can about her world. Unfortunately, before he's able
to ask her anything, the girl is killed by one of his would-be
usurpers, leaving just her bare soul behind. Staz vows to help the girl
restore her body and return to her former life-especially since it means
taking a trip to the human world himself!