Heizo's cousin Senemon Misawa and his son Katsuzo visited Heizo's home. Heizo learns that Senemon has fallen in love with Katsutoshi, a woman who works at the Yamabukiya Tea House, and has asked her to marry him. Heizo decided to visit Yamabukiya, saying "I will try to find out if this woman is a bodhisattva or a demon." After meeting Katsutoshi Heizo, felt embarrassed and ordered Gorozo to inquire about her just in case. Gorozo, in turn, sends secret detective Rihachi to Yamabukiya with the task of keeping an eye on Katsutoshi...
An old thief, Kuhei Sagiwara, used to visit his hometown at the foot of the Kurikara Pass in Kaga Province. Hiding from the rain, he overheard a secret conversation between three men, just like him, hiding from the rain. These three conspired to kill Heizo Hasegawa, the head of the arson and robbery police squad, and the head of these three is the outrageous villain, thief and murderer Jingoro Amikiri...
Heizo "The Demon" investigates the shop of Toshimaya the swordsmith, where 280 ryo was stolen and twelve people murdered. This particular group of theives are most dangerous because of the willingness to kill for money, but what about this mysterious unibrow, who is he? What is he up to?
Edo town thief called "Acrobatics boy" has been rampant in town, just that time, spy, Goro of Otaki will see a woman who had been an inside contact of the Yataro by chance. Also, Heizo is worried about the child of Inoue Tatsuizumi, who decided to ask for help for Gen'an.
Heizo "The Demon" deals with an arson thief gang known as "Bungoro" the fire thief who leaves a calling card as evidence. As a street notice, showing the thief of Ohno shop, but it is not Bungoro, it's the quick work of a solo member. Heizo Hasegawa with his hands full may have caught a break, it may be a falling out among the thieves.
Takahagi Sutegoro is highly skilled at casing locations for thieves so that he can sell detailed floor plans to them. He suffers an injury to his leg while trying to help a parent and a child being threatened by samurai. Heizo jumps in and chases the samurai away. Feeling indebted to Heizo, Sutegoro decides to become his spy. Now, together they will try to stop scheming Myogi Danemon’s gang of merciless thieves...
Detective Onihei better known as "Heizo the Demon" heads a group of skilled officers, however, one of those special officers got himself into a web of betrayal and deceit, and become the very thing Heizo the Demon investigates daily.
