強くてニューサーガ

Kyle finally kills the Demon Lord after years of war, only to lose every friend and ally along the way and realize, dying from his wounds, that the victory cost him everything that mattered. A mysterious gem sends him back to his youth with all his memories and strength intact, giving him a second chance to fight the same war differently. This time, Kyle sets out to build the influence and alliances he never had before, determined to save the people he has already watched die once.