Hasegawa is a chief police of big heart who leads a band of samurai police and cultivates reformed criminals as informants to solve difficult crimes.

A ronin desperately seeks a way out of financial straits; he allies with the Tosa clan under the ruthless leader Takechi, who quickly takes advantage.

As a child, Okin the one-armed one-eyed swordswoman was disfigured by Lord Daizen-dayu, who was after her family's most treasured possession, the famed Drenched Swallow sword. As an adult, she has become a skilled swordswoman and lives a carefree life with her adopted family. One day, Okin saves a girl from a group of yakuza, and in doing so, gets involved in a grand conspiracy involving religious leaders, government officials, the yakuza and Lord Daizen-dayu, the man who killed her father and mutilated her body...

A criminal syndicate wants detective Onihei dead, but the resolute hero proves to be hard to kill.

The samurai Akiyama Daijiro is asked to help a young boy who tries to bring the man who murdered his father to justice. In the course of their quest they uncover a plot by one of the clan officials that could change the course of history.

Fujieda Baian is admired during the day as a skilled acupuncturist. However, at night, he is a highly skilled assassin, taking on contracts to quietly eliminate those whose existence is deemed toxic to society. Baian's latest target, assigned by his boss Otowa, is Shirakoya Kikuemon, the head of a powerful organization in Osaka. In the past, Baian had been indebted to Shirakoya, but due to a conflict involving the swordsman Kosugi Jūgorō, their relationship has turned adversarial. After his lover is abducted, Shirakoya storms into Edo. With his life now targeted, Baian resolves to confront Shirakoya in a desperate final showdown.

Thief Yaheiji (Keizo Kanie) helped a dying young samurai (Hiroaki Murakami), after recovering, he lost his memory and returned to Edo under the name of Yataro Tanigawa. Yaheiji meets Yataro again in Edo, by which time Yataro has become a dark hunter (Hired Assassin). The boss of thieves to whom Yaheiji obeys is killed, and Yaheiji participates in the battle to take his place Yataro helps him defeat and save his life, and Yaheiji also tries to save Yataro from the world of assassins... The drama "Dark Hunter" is based on the novel by Shotaro Ikenami, who is best known for his TV series Onihei Hankacho, Kenkaku Shobai and Fujieda Baian's Shikake-nin. The film version directed by Hideo Gosha is well known, but this version is more faithful to the original.