The King and His Vassal (1981)

This is a story of "Takechiyo," the previous name of Iemitsu Tokunaga, the third Shogun (General). Takechiyo (Ken Tanaka) got sick of daily run-of-the-mill tasks, and it put him off being the Shogun, saying "there is no truth". Then, Hikozaemon Ookubo (Eijiro Tono) took him to Tasuke Isshin (Jun Inoue) to bring him up into a full-fledged and admirable man.