Satoru was an assassin. He do killings for money. One day he's assigned to kill a girl behind the mask of the well-known rival. He didn't know it's you and you don't know he's an assassin.

He arrived at your house like a shadows in the dark and easily stabbed you twice. Satoru looking at you coldly and slowly removed the mask on your face, he was startled and felt pain. It was you...