It is the Sengoku period - or the Warring State era - in Japan, and the Tokugawa Shogunate has won hegemony over the land, yet the Toyotomi clan in Osaka continue to resist Ieyasu Tokugawa's forces. To prepare for an impending attack, the Toyotomi summon lion-hearted general, Yukimura Sanada. However, the reputedly fearless general has a secret: his legendary battles are all planned and executed by a group of misfit warriors dubbed the Ten Brave Heroes. Led by former ninja, Sasuke Sarutobi, the Ten Braves take centre-stage in one of the greatest power struggles in Japanese history. Can Sanada's hired mercenaries win him the Siege of Osaka and alter the course of history?