After dying in his first world, a boy is reborn, masters magic, and at sixteen is sent by several gods into a dangerous other world. Armed with granted abilities and appraisal, he spends ten years improving that world before conquering its deepest dungeon and defeating the god of misfortune, only to awaken one month later in his original world, still sixteen. He returns home with his memories and powers, reunites with his family, and begins a new journey with three friends.