In 1274, a Mongol fleet led by Khotun Khan invades the Japanese island of Tsushima. Local samurai Lord Jin Sakai and his uncle Lord Shimura lead the island’s samurai in an attempt to repel the invaders. However, the battle ends in disaster with the samurai killed, Shimura captured, and Jin severely wounded and left for dead.
The player controls Jin Sakai, a samurai on a quest to protect Tsushima Island during the first Mongol invasion of Japan. Jin must choose between following the warrior code to fight honorably, or using practical but dishonorable methods of repelling the Mongols with minimal casualties. Jin must become the Ghost if he is to defeat the Mongol threat upon his homeland.