The Berühren Corporation has released the technology for creating powerful cyborg soldiers for public use. Individuals equipped with robotic parts are referred to as the Extended. Juuzou Inui, one such Extended, was built as a soldier and possesses no memories of his previous life. However, in the post-war era, he operates a business that handles incidents involving the Extended throughout the city. Rumors reach him regarding a renegade Extended who has kidnapped a child; coincidentally, as Juuzou returns to his office, a giant robotic man carrying a boy on his back crashes in, pleading for assistance. Although Juuzou could simply hand the individual over and conclude the matter, the situation appears too suspicious to disregard. It seems that everyone desires possession of this child, and whether he wishes it or not, Juuzou must determine why this Extended is fleeing, how the matter connects to the Berühren Corporation, and the extent of the treachery within this city.