After fighting with humans for over two hundred years, the Demon King became feared by people and no one dared to challenge him anymore. Since the Demon King is aware that he doesn't have much longer left to live, he decides to raise a hero himself. He just wants to fight one more time! So the "Hero Raising Project" began. The Demon King himself will raise the hero to be the hope of the people, then defeat the hero to give despair to the human world. But the candidate is a coward girl...!?