Decades after the end of the Earth broke out, John Booth was a powerful interstellar warrior. He was fighting against the Star Emperor on Pluto, but an accident occurred during the battle and he died. When he woke up, he surprisingly found himself resurrected in his alma mater back when he was on Earth. Without having time to conduct in-depth investigations, based on the calculation of time, the doomsday was about to break out soon. So he took his best friend and went to gather supplies to prepare for the doomsday. Unexpectedly, on his way to buy weapons, the doomsday broke out ahead of schedule. He hurriedly rushed to the blacksmith's shop, and then something unexpected happened. A strange woman showed up and told him that he was already dead. During the conversation, John Booth figured out who the other person was. It turned out that she was the apprentice he had adopted in his previous life. However, this apprentice's attitude towards him had changed for the worse, and she wanted to imprison him. Immediately, a fight broke out...