Kenta Tachimura had fulfilled his ideal fantasy. He was transported to another world, gained unimaginable power and defeated the demon lord, becoming a legend. However, consumed by ambition and power, Kenta conquers everything and everyone in his way, becoming a tyrant. In the quiet aftermath of his reign, he is haunted by the ruins of the world and the lives he destroyed. Driven by remorse, he is given a chance to turn back time, to undo his catastrophic mistakes, and reclaim the happiness he so recklessly sacrificed. The return, however, doesn't go as expected...

Can Kenta face his new circumstances, fulfill his mission as the Hero and fix his mistakes?