The Nine Demons [九子天魔]

Childhood friend Joey and Gary are the only survivors of a coup against Gary's family. Joey lands in hell, and sells his loyalty to the devil in return for magic powers. As part of the deal, Joey has nine demons enter his body. The demons demand a daily feed of blood, but they must obey Joey. He uses the new powers to help Gary, and to kill the plotters. But events soon get even more complicated.