He is a boy from the future who mastered incredible martial arts here and met four friends who would live and die alongside him. Together, the five of them defeated the Demon Lord, who had been about to rule the world. His victory sent him back to his original world, where he forgot everything that had happened. But he eventually discovered that the Demon Lord was not dead after all. He took up his magical weapon once more and joined forces with the friends who had come from the past to fight the Demon Lord again.
