Kuzukago Mountain is the place where everyone's trash ends up. From old newspapers to children thrown away by their parents, the mound is home to these items and individuals. One of its residents is Poi—a young and adept girl who can repair almost anything. As she goes around the area gathering things to fix, she stumbles upon an unconscious man in the back of a trashed ambulance. Curious about who would throw out invaluable genius, Poi gives the man a prosthetic right arm and takes him on a tour of the mountain, upon which the doctor begins to question everything around him.

[Written by MAL Rewrite]