Based on

Movies like Wind Whistle in Field, Demon Sword: Matsudaira Tadateru cutting the world (1987)

Tadateru Matsudaira, the sixth son of Ieyasu Tokugawa, was exiled for not taking part in the attack on Osaka Castle. 10 years before his exile expired, he was attacked in a clandestine Yagyu operation believed to have been ordered by his older brother Hidetada. In order to correct his brother's true intentions, Tadateru broke the law and went all the way from Hida Province, where he was exiled, to Edo Castle. However, the Yagyu do not stop trying to kill Tadateru...