The Mongol invasion arrives and there is no heroic defense, no last stand that turns the tide. You watch samurai tactics crumble against cavalry that fights nothing like them, armor that means nothing, strategy that dies the moment contact happens. This is what it actually costs to lose a war you thought you understood, told by men who have to keep fighting anyway.

In 1274, after conquering most of the known world, the Mongols set their sights on Japan, and their first move toward a full invasion of the mainland is seizing Tsushima Island. Kuchii Jinzaburou and a band of exiles are dispatched to the island by the Kamakura Shogunate, answering a request from Princess Teruhi. Once there, they must stand against overwhelming odds as the fate of Tsushima hangs in the balance. Adapted from Takagi Nanahiko's historical shounen manga, the twelve-episode TV series is a historical action drama about a samurai and his companions defending Japan during the first Mongol invasion.