The Vampire and His Pleasant Companions Vol. 2 (manga)

When he is brutally attacked in the park Al's vampiric nature is the only thing that prevents him from becoming the latest death in a string of serial stabbings. Ever since becoming a vampire, Al has always felt like a burden on the people around him--especially Akira. This time, his unique abilities will be an asset in helping the police track down his would-be killer. Surely even Akira can't fail to be impressed by the great bat detective!