A humble and simple Takezo abandons his life as a knight errant. He's sought as a teacher and vassal by Shogun, Japan's most powerful clan leader. He's also challenged to fight by the supremely confident and skillful Sasaki Kojiro. Takezo agrees to fight Kojiro in a year's time but rejects Shogun's patronage, choosing instead to live on the edge of a village, raising vegetables. He's followed there by Otsu and later by Akemi, both in love with him. The year ends as Takezo assists the villagers against a band of brigands. He seeks Otsu's forgiveness and accepts her love, then sets off across the water to Ganryu Island for his final contest.

Musashi returns Japan's legendary swordsman and philosopher to the screen once again. In an original period drama based on the historical facts of the life and travels of the famous Miyamoto Musashi we find an apprentice, an instructor and the account of a famous battle in Japan of the Middle Ages where many questions will be answered.

The fifth and final installment with the build up of the epic battle between Sasaki Kojiro and Miyamoto Musashi. With all the familiar characters making appearances: Otsu (Musashi's great love), Akemi, Matahachi (his former fellow soldier), old lady Osugi (still doggedly trying to defeat Musashi), and even the return of Priest Takuan (the man responsible for his journey towards enlightenment). But most of all, the boastful, long-haired and long-sworded Sasaki Kojiro.

In the 16th Year of Keityo (1611), the lord of Ogura Castle in Kyushu admitted Sasaki Kojiro's because of his great sword techniques. However, a group within the feudal clan which supported to use guns considered Kojiro an obstacle in their goals and has the well-known ronin, Miyamoto Musashi, fight him. Now because of political gain and greed, two honorable men are to fight to the death on Ganryu Island.