Prequel
Year XXXX, Month XX, Day XX
A silver haired teen boy was walking down the streets in the city. He wasn't paying attention to anybody or anything. He just simply thought what he should do next for his training method and his promise to play with his younger sister. His grandparents tell him often that the world seems a lot livelier and kinder compared to the past. Of course there were crimes, anger, loneliness, accidents, suicides, and fights, nowadays. But he wanted to change the world to make it even better. He doesn't know why, but he feels that he promised someone. Someone who was extremely precious to him, even though he can't remember who it was.
He walked pasted a walking girl with red headphones. He stopped and turned around. He swiftly grabbed the girl's right shoulder. The girl turned around and the boy smiled.