Watch Miyamoto Musashi VI: Swords of Death (1971) Online

In the sixth and final episode Rentaro Mikuni steals the show as Baiken Shishido, Musashi's nemesis. Mikuni is the nominal villain of the film, but he is a devoted husband and father as well. He tries to kill Musashi only to avenge the death of his brother-in-law. While Baiken (who wields a chain and sickle against Musashi's sword) is a very human character and the emotions that Mikuni displays in his performance are quite believable and engaging