During a gathering of detectives, Satake is the only one not indulging in the hospitality of a wealthy money exchanger. His senior, Yasuke, leaves the gathering and warns Satake they will soon be targeted by a powerful figure. Yasuke is later tortured and killed by an unknown assailant. Satake learns from Yasuke's wife, Osaki, that Sagamiya was targeting him. A female pickpocket, Oyu, reveals Sagamiya's malevolent nature. When Oyu steals from Sagamiya and gives the wallet to Satake, he finds a promissory note for 10,000 ryo borrowed by a young magistrate from Sagamiya. Realizing his colleague, Constable Tanabe Seiichiro, is being manipulated by Sagamiya, Satake faces a dire situation. Midori suspects Satake of having a relationship with Oyu, and Ichi is of no help. Leaving the island for Edo, he is pursued by three ruthless individuals and Sagamiya's sinister bodyguard.
