On September 15, Keicho 5, a young man, Musashi (Takezo), whose life was ruined by the war in Sekigahara wandered around like a wild beast. Only his lover Otsu and the pacifist monk Takuan understood Musashi, who escaped from the hands of the Ochimusha hunters and turned against everyone. Then, a crisis loomed over Musashi as he fled into the mountains. At the same time, in the village of Jokyoji in Echizen, the sword prodigy Sasaki Kojiro, in his quest for strength, had defeated his own master, Tomita Seigen, and got out of the village.

The wandering swordsman, Ino Heihachiro, defeats Ichima, the youngest of the famed swordsmanship trio, the Nikis, but sustains an injury. In the mountains of Tohoku, he is aided by a young boy named Shosuke. Heihachiro finds refuge in the home of the boy's parents, Magoichi and Shino, only to discover that Magoichi was a skilled ninja from Koga. The peaceful days with the family are short-lived as Ichima, bent on revenge, along with his brothers Kurodo and Ryuma, pursue Heihachiro. Heihachiro and Magoichi head towards the duel's location, but the village headman, Seibei, blinded by the allure of gold dust in the mountains, abducts Shino...

Heiji is an undercover policeman in the city of Edo. He possesses a superior skill of throwing coins. When a criminal is caught, Heiji throws coins at the offender and reveals his true identity. Like “Abarenbo Shogun,” “Mito Komon” and “Toyama no Kinsan,” “Zenigata Heiji” is about an official working undercover to catch criminals. The hero was created by novelist Kodō Nomura in 1931.