The Frontier Army has finally captured Mount Grief, but before they can mourn those they've lost along the way, a messenger from the dwarven kingdom comes begging for help! The dwarves are under siege in the Kurogane Mountain Range, and Haruhiro and his friends must repel the invasion! To reach the kingdom, they have to travel across the Quickwind Plains, a treacherous land of giants and monsters. What awaits them on the other side just might change the world forever!