The Shogun's Vault III

Tomizo, a master storehouse-breaker who has been released from prison in Denmacho after serving five years plans to break into the Edo Castle gold storehouse to avenge the death of his father, who died a violent death at a gold mine on Sado Island. With the help of Hanji, a playboy who took care of him in prison, as his partner, Tomizo decides on the night of fireworks to be held in Edo Castle as the day to carry out his plan. Kanpei, a wise man, is suspicious of the plan.

A mysterious thief called "Yami no Kiba" (Fang of Darkness), who sneaks into the residences of the shogunate one after another and steals the shogun's treasures, has been shaking the public authorities. The identity of the thief is Ichibei, a medicine seller whose father was once killed by the shogunate, and his daughter Oasa. Ichibei had been seeking revenge against the official to avenge the death of his father, Sasajima Hyobu, who was a member of the Kurokuchi clan, the official ninja. He was also plotting to seize the gold orca of the Nagoya Castle keep, aiming at the Owari clan that had slain his father. ......

Account magistrate Wakisaka Bizen Mamoru asks Yoshibei, the chief priest of Iriya and Myohoji Temple to explore the Sado Gold Mine. They suspect that large amounts of money are being diverted to somewhere else. Yoshibei, a former official secret-head accepts the job and recruits three skilled Karadogumi… Nanikiri, Hayashi, and Kumonryo. In Sado, where the four infiltrate, the magistrate Okubo Hitachi Mamoru who plans to overthrow the shogunate is trying to buy a large number of firearms from Russia.