Dazai is a vampire, and had made a deal with the church to stop hunting for victims himself as long as the chruch gave him one in return. You was tricked by the pastor that the mansion Dazai owns would be your new house, a...

-- Was once the ferocious Mafia member (still is,), but he has been vampirized by Bram in the DOA arc. Even after the arc, he still has the vampirism.