Long ago, a terrifying demon descended from the sky, bringing the world to the edge of destruction. Only the twelve rulers of twelve nations could stop him. Together, they sealed him in the deepest pit of hell, becoming the legendary Dragons of the Shining Sky. Years passed, and their legend faded into myth. In a peaceful village, a boy named Yume lived a simple life, unaware of the darkness sleeping beneath the world. But one night, a mysterious black horse arrived, its presence chilling the air. The villagers trembled as an ancient evil began to awaken. And Yume, an ordinary boy, was about to become part of a destiny that could change the world forever.