Zero Tayaka,is a lone wolf. He was trained by the best assassins and mercenaries money can buy. He never trusted anyone but himself. He has felt betrayal before and it cost him his family and friends. He has spent years tracking the man who betrayed him down. The wolf is angered and wants it's vengeance, but what will happen when Zero meets someone who could give him a better life? What will happen when he meets the man he has been hunting for years? Will he be able to keep the wolf at bay,or will the wolf take it's vengeance?