At the end of the 13th century, the Mongol Empire launched an eastward invasion, leaving scorched earth wherever its iron hooves passed. The ruthless and cunning Mongol commander, Kublai Khan, led his fleet to invade, and Tsushima Island was the last line of defense between the invaders and the Japanese mainland.

When Tsushima Island was set ablaze by the first wave of Mongol attacks, the brave samurai, Sakai Jin, resolutely stood up. As one of the few survivors of his clan, Jin made up his mind to protect his fellow countrymen and reclaim his homeland at any cost. He had to abandon the lifelong path of the samurai and carve out a new way as a “war demon,” using extraordinary methods to fight for Tsushima Island’s freedom.