Miyamoto ( Takeshi Kaneshiro ) is a " Returner ", whose job is to infiltrate the depths of the black market on behalf of his employers, stealing large sums of untraceable money and delivering it safely into their hands with extreme efficiency . Originally an orphan , Miyamoto 's childhood friend, Kiban , was killed by a mysterious man whom Miyamoto has vowed to kill in revenge . At the coast of Yokohama , Miyamoto is about to infiltrate another underground world when he encounters the man who killed his childhood friend .