When a five-year old boy, Ietsuna, suddenly becomes the Shogun of Japan, numerous schemes to seize his power begin to hatch. The Shogun's trusted guardian, Hoshina, secretly asks the leader of the exiled Iga ninja clan, Hattori Hanzo, to help protect the stability of the nation.

Under orders from the Kouga clan, a revenge-seeking female ninja, Okou, infiltrates the bathhouse that doubles as the Shadow Warrior's secret base. Meanwhile, a wild Iga ninja causes trouble for Hanzo by refusing to remain in hiding.

Daihachi and hyouroku catch a gang of burglars fleeing the scene of a crime. The perpetrators are members of the mysterious Tsuchigumo clan whose well-connected leader wants revenge on the Iga ninja for interfering with his schemes.

One by one, members of the Iga clan fall prey to the supernatural powers of a frightening old hag. Hanzo connects these baffling events to a vengeful enemy who once used sorcery against his ancestors.

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