Dobu (Kunie Tanaka) used to be a soldier but now is a private detective. Three vagrants were killed in a shrine, and Dobu found out that those three had a grudge on a timber whole seller, Hinokiya. He reunited with Zirokichi (Takeo Chii), one of his friends and Nezumi Kozo (a thief) , and he infiltrates Hinokiya together.

Dobu, an Edo samurai, is tasked with investigating a string of noble murders in Kyoto, disrupting his routine in Shimotani.

A martial arts master/detective investigates a series of murders and helps a deaf bathhouse attendant, Hisako.

Samon Kamiyama, a skilled yoriki under Toyama Saemon-no-jō Kagemoto is feared and known to the villains as “Samon from the Hell.” Samon suspects that the drowning incident at the raw silk wholesaler Shinano-ya was the work of Maruya Rihei, a kimono wholesaler favored by the Ōoku, but has no evidence to prove his allegation. The elder Arao Tsushima-no-kami who is colluding with Maruya plan on building a gold mine on an uninhabited island using prisoners. Arao gives the supervision charge to Samon, who along with his comrades and Horikawa takes up his post on the island but is attacked by assassins one after another.

Oniwaban is an organization that is composed of two ninja groups… Iga and Koga. This is a story of a secret spy who settled in Okazaki Joka town during the Seitoku period of General Ietsugu and his son who trained to be a Ninja.