A hero who was summoned to a different world and led the world to peace, Souta Konoe, at that time was a third year junior high school student. However, at the moment of subjugation of the demon king, he was subjected to repatriation magic and was returned to the Earth, with all his memories up to the final fight becoming very ambiguous during the process... Several years have passed, but Souta did not forget the promise of training with his comrades who taught him how to fight, and devoted himself to the martial arts. He was a senior high school student, when he was caught up in his classmate's hero summon and summoned to another world again. However, this another world turned out to be the same one he was in before, but a thousand years later... Souta puzzled by his memories from before decides to go on another adventure, but this time to find out the truth!