Thirty years have passed since the demon king "Haddes" reigned over this world. Although the demon king is not powerful enough to cover the world in darkness, he has caused a certain amount of suffering to the people by sending letters of misfortune to the villagers. However, the people had not lost the slightest glimmer of hope. There is a young man here named "Yashiyu". Those who looked at him with prejudice said, "This guy can defeat the Demon King. "He will defeat the Demon King! Then there will be peace again!" Driven by a sense of mission, a Hero and his heroes have now risen up.