he is the son of the boss of a hitmen agency. This agency trains people to become hitmen and pays well

when the government, three months before the start of the story finds out about this agency, decided to put an end to it, worried about the future of his son, he decides to make him espatriate, accompanied by the best hitman: Rintaro Suna.

the day of the espatriation, Suna is waiting outside Osamu's room, when Osamu exits looks at the man in front of him, not expecting what he saw