The story is set in a neo-futuristic age, in which aggressive "carbon trading" practices have been introduced in countries around the world to combat accelerating global warming. The Japanese Government promoted a project run by Atlas Corporation to reduce carbon emissions by turning Tokyo into the world's largest "jungle-polis." Atlas Corp started constructing an unprecedentedly high tower city called Atlas to relocate only the rich and privileged.
Kuniko Hojo, 18-year-old leader-designate of an anti-government guerrilla group Metal-age, returns to her town after 2 years of imprisonment. In concert with the Metal-age comrades, Kuniko rises in a rebellion against the government for those people left on the once-flourished ground of Tokyo.