In a tumultuous era of warfare and turmoil, the ancient and potent Imperial Seal selects its wielders, granting formidable power. Amidst epic battles and heroic legacies being forged, fear and devastation loom over the land. Enter Rikuson (Lu Xun), reluctantly drawn into the conflict as his family's legacy, the Imperial Seal, falls into enemy hands. Tasked by his mentor, Rikuson allies with Sonsaku to unveil the Seal's true purpose. Tragedy strikes as Sonsaku is assassinated, leading Rikuson on a quest to retrieve the lost Imperial Seal and unravel his own fate.