Hikaru Miyazaki was only very young before being taken in by the mafia. He had discovered that he had a talent for being a hitman for the mafia, becoming their best asset within their ranks. However his days as a hitman come to an end after taking up a risky job, resulting in a prodigy detective to come after him. Yet as the hitman and detective look past their differences, they begin to form a bond unbreakable.