In Japan's Sengoku period, Takeda Shingen, "daimyō" of the Takeda clan, meets with his brother Nobukado, and an unnamed thief whom the latter met by chance and spared from crucifixion due to the thief's uncanny resemblance to Shingen. The brothers then agree that he would prove useful as a double, and they decide to use the thief as a "kagemusha", a political decoy. Later, Shingen's army has besieged a castle of Tokugawa Ieyasu. One evening when Shingen visits the battlefield he is shot by a sniper who has mapped Shingen's previous movements in the camp. Mortally wounded, he orders a withdrawal and commands his generals to keep his death a secret for three years. Shingen soon dies with only a small group of witnesses. Meanwhile, Shingen's rivals Oda Nobunaga, Tokugawa Ieyasu, and Uesugi Kenshin each contemplate the consequences of Shingen's withdrawal of his army still not knowing of his death.