Mumyo Tsunataro killed his betrayed fiance Orie and He flees to Utsunomiya. On his way he happens to saves Chisaka Hyobu's daughter Oyu (She is exactly like Orie) be attacked by ninja. Thus he stays Chisaka's residence in Yonezawa. Chisaka was just trying to stop Forty-seven ronin's revenge against Kira Kozukenosuke by female ninja's sexual entrapment. Chisaka asks Tsunataro to lead female ninja. Tsunataro accepts the request on condition of marriage to Oyu.

Eight villains, former pirates, gather to attack the magistrate's office. They develop a plan and begin their actions in secret, making full use of their special abilities. In the end, their plan goes beyond what was intended and turns into a good deed for many people. A masterpiece of historical drama, full of breathtaking thrills and action.

As the Shogun lays dying, seventeen Iga clan ninja are sent to infiltrate the impenetrable fortress where his youngest son is preparing to storm Edo Castle and name himself Shogun by force of arms. They are to either steal the documents that will eventually give him lawful claim to rulership, or they are to assassinate him. But even before they reach the castle walls, they find their every move countered by a ruthless ninja hunter in the employ of the would-be usurper (Konoe), who not only knows their every tactic but knows the exact make-up of their team thanks to his own spies within Edo Castle. As the Iga Ninja fall one by one, the mission's success or complete failure--where failure will result in a bloody war of succession--comes to hinge on a single young and inexperienced ninja (Kotaro).