Vil is on a wandering journey after his family blacksmith shop is taken away from him and his fiancée by his younger brother. However, his grandfather Happousai was a talented craftsman who was in charge of the maintenance of the world's only six sacred swords, and Vil inherited his talent. He has made the impossible possible with his extraordinary craftsmanship and has earned the respect and trust of the demons and dwarves. But he is completely unaware of this and simply, as a craftsman, makes what he wants to make and fixes what he wants to fix. But then an enemy appears...?