Lunar Legend Tsukihime (2003) IMDb
Ever since a near death accident in his childhood, a boy is able to see the life lines of all things, and with a knife it seems he has always owned, he can sever the lines and destroy anything. This ability comes to be highly prized by a woman he’s killed.
Horror, action, romance. Unnecessarily mysterious at times, but beautifully drawn and refreshing as far as the vampire genre goes. The deadpan comic relief could be unintentional. The manga shows him using the ability with another knife, and suggests a compulsion for rape as part of the main character’s cloudy motive in the early murder.