Three young boys, Ryo, Gawl, and Koji, journey to the past with a singular mission: to alter the course of history. In their era, they unveil Kubere's reliance on genetically modified individuals known as generators for warfare, triggering the devastating Third War that decimates humanity. Now, armed with the knowledge of these events, Koji, Ryo, and Gawl strive to rewrite the past and reshape the future.