Seppuku Day 17 Ako ronins, including Kuranosuke Oishi, who were entrusted to the Hosokawa family, and the events of the two days before are depicted as a tragic romance between one of the ronins, Jurozaemon Isogai, and Omino. An adaptation of Seika Mayama play "Genroku Chusingura, the Last Day of Oishi", which tells about the torments of life and death of samurai living in feudal times.

In the Tokugawa Era, the clan of Lord Yagyu has hidden away three scrolls containing clan secrets which, if revealed, would cause revolution and disaster for the clan. The information is divided among the three scrolls, all of which must be possessed for the secrets to be understood. When Princess Yuhime steals the scrolls, Tasaburo, a samurai with magical powers, and his brother Senshiro are sent to retrieve them. In Part II, the search for the scrolls continues.

Seventeen years after the atomic bomb was dropped on Hiroshima, a newspaper reporter looks for the bomb's effects, but everyone seems to have forgotten. He meets a woman who was there when it happened but when they fall in love she isn't able to move on.

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.

After years on the road establishing his reputation as Japan's greatest fencer, Takezo returns to Kyoto. Otsu waits for him, yet he has come not for her but to challenge the leader of the region's finest school of fencing. To prove his valor and skill, he walks deliberately into ambushes set up by the school's followers. While Otsu waits, Akemi also seeks him, expressing her desires directly. Meanwhile, Takezo is observed by Sasaki Kojiro, a brilliant young fighter, confident he can dethrone Takezo. After leaving Kyoto in triumph, Takezo declares his love for Otsu, but in a way that dishonors her and shames him. Once again, he leaves alone.

Struggling to elevate himself from his low caste in 17th century Japan, Miyamoto trains to become a mighty samurai warrior.