In a post-apocalyptic society, much of earthquake-ravaged Japan has been left in ruins, leading to an overgrowth of vegetation. Governments control a significant portion of the world's emissions, which has created a severe class divide and economic inequality. The Japanese government initiates "Project Atlas," a utopian city designed to replace Tokyo but with capacity limited to a specific number of residents. This restriction forces some individuals to live as refugees in the surrounding jungles outside the city walls. However, every flawed plan attracts those willing to challenge it. These challengers include Kuniko Houjou, an heir to a renegade town; Mikuni, a mysterious and powerful child held in a secret temple; Kunihito Kusanagi, a soldier serving the high-tech, exclusive monopoly of Atlas; Karin Ishida, a genius economist with influence in markets worldwide; and the villainous Ryouko Naruse, who leads Atlas in its domination of this future world. Can this group of rebels, forming a movement called "Metal-Age," unite to prove that inclusion and teamwork triumph over cruel segregation?