As the danger of the Culling approaches, Yuke is chosen by The Golden Priestess to become the Hero. Together with Zaccard and the members of Fullbound, he ventures deeper into a new dungeon in hopes of saving the world. But Zaccard, burdened by his responsibility to the city of Duna, falls prey to the corrupting influence of the Setting Sun and his own growing sense of inferiority. Before long, he turns against Yuke, his very own ally. As the dangerous monsters of the new dungeon close in from all sides, Yuke, haunted by regrets over his late friend Simon, faces off against Zaccard in a fierce clash!