Historical and political detective. The main characters are drawn into court intrigues, and the investigation of corruption in the administration of the shogun Ienari Tokugawa comes to the fore in the plot. Based on the novel of the same name by Matsumoto Seicho.

A power struggle in the fief of Okazaki causes the death of Namiji, a nobleman's daughter. As her fiancé seeks revenge, he finds Namiji's cat helping him, along the Fifty-Three stations of the Tokaido Road. Co-starring Shintarô Katsu and Takako Irie.