The year is 1274. After conquering most of the known world, the Mongols turn their sights on Japan and their first step on the road to a full invasion of the mainland is taking Tsushima Island. Kuchii Jinzaburou and a group exiles are sent by the Kamakura Shogunate to the island at the request of Princess Teruhi. There they will face overwhelming odds and the fate of Tsushima will be decided!