Durarara!!

A character in a dark, fur-collared coat smiles in a monochrome close-up, then the scene shifts to a blonde character in a white shirt clutching his chest in pain, followed by a hand gripping a knife that glints in the light, then a dark-haired character holding the knife with a smirk, and finally the blonde character running frantically down a dimly lit alley at night, pursued by shadowy figures.