A samurai lord has bartered away his newborn son's organs to forty-eight demons in exchange for dominance on the battlefield. Yet, the abandoned infant survives thanks to a medicine man who equips him with primitive prosthetics—lethal ones with which the wronged son will use to hunt down the multitude of demons to reclaim his body one piece at a time, before confronting his father. On his journeys the young hero encounters an orphan who claims to be the greatest thief in Japan.

In 2030 AD, after being abandoned by his creator, a young boy robot is rescued by an Android Advocate, Dr Elefun, who adopts him as his own and guides him in the use of his special powers to aid and protect mankind and robot-kind.