During the reign of Shogun Tsunayoshi, seven ninja of the Koga clan secretly plot against the illegitimate son of the former shogun.

The story concerns the efforts of seven master swordsman who join together to protect the new inexperienced Shogun Tokugawa Yoshimune from the evil plans of the Owari Clan's corrupt Lord. It's a colorful bunch, a drunk samurai, a master thief, a sword instructor and a Lord who is disguised as a ronin since it is an executable offense for a lord to wander outside of their domain without permission. As the Chief Magistrate becomes suspicious of the Owari plot to send men to Kodenmacho Prison to start a riot he begins to investigate the rumors. He soon calls upon the Lord of Mikazuki Castle and the Shogun's best friend to help thwart the evil ambitions and battle the rouge swordsman hired by the Owari Clan.

Young lord Saburo Nobuyasu struggles to find comfort in life. His arranged marriage to Tokuhime, daughter of one-time family enemy Oda Nobunaga, provides little happiness. His manipulative mother adds further complications through her constant interference and attempts at defeating the Nobunaga family.

Upon his arrival to Dragon Island, ronin Yagi Hanzo, is propositioned by various shady individuals representing rival gangs to lend his services to them. Branded an enemy for his refusal to become involved with either side, he soon finds himself caught up in an intrigue extending beyond petty gang rivalries, involving a plot by Daimyo in Kyoto to overthrow the government.

A young son of a master of the Kuwana clan gets disowned for his rebellious behavior. After he goes from the mountains to the ocean defeating the evil, he becomes a fine man.

1961 Japanese movie