Famous Kabuki actor-turned-movie-star Kazuo Hasegawa plays the Shogun's secret agent Gennojo Norizuki going undercover as a Buddhist priest to investigate a plot against the Torinaga Shogunate in the Awa Prefecture, which has since been named the Chiba Prefecture.
On Gennojo's mission, he's confronted with Yone Igaya (Fujiko Yamamoto) who desires to take vengeance on Gennojo for killing her father. Her attentive servant, Morihei (Naritoshi Hayashi) is close behind her.
There is also a young swordsman named Ryutaro Inui (Raizo Ichikawa) who has left his father's dojo to become a kendo instructor at another dojo. Ryutaro quickly recognizes the talent of Gennojo and challenges him to a dual. Reuters's cousin, Ofuku (Satoko Minami) is in love with him, but this character isn't very drawn out.
There is also a ninja woman, Otsuna (Chikage Awashima) who has been trained with the same school as Gennojo that is in Awa in search of her father, Koga Yoami who has been imprisoned for many years in the mountains for knowing the plot. Old Yoami has been writing down about the plot in his own blood.
In the Awa castle, Lord Awa has been insane for years. His plots against the Shogun have been molded by Yakeya Sanmi, with the knowledge of the Chamberlain Izu Waki (Osamu Takizawa) and the other prefect leaders.
Can Gennojo uncover the plot and stop the people involved?