Koji, Ryo, and Gawl are three young boys whose sole aim is to alter history by journeying back in time. Upon arrival, they uncover that their nation, Kubere, employs genetically enhanced individuals known as generators for military purposes. Tragically, this leads to the devastating Third War that decimates the majority of the human race. Armed with the knowledge of past events, Koji, Ryo, and Gawl are determined to rewrite the course of history.