After the mysterious murder of his parents, Yoichi Sakagami struggled to live a normal life taking care of his young siblings. The only way he survived was by exploiting a mysterious ability he had to regenerate his organs. But when shadowy forces come after him, he'll find that there's more to his ability than he thought. Will he be able to control it to get his revenge and protect those he cares about? Or will the power he has control him instead?
Zephyr is the last human fighting evil in a world abandoned by the gods. When he is killed in battle by Tartarus, the god of destruction, all hope for humanity seems lost. But Zephyr’s fate is not sealed -- the gods who find his battles entertaining have gifted him a second chance at life, as he is sent ten years into the past, back to when he was a slave instead of the most powerful human alive. Can Zephyr get his revenge against Tartarus and save the woman he loves, or is he doomed to repeat the past?