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.
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...
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'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...
Matauemon Araki (Kotaro Satomi) is a sword teacher in Yamatokoriyama. He heard from his brother-in-law Kazuma Watanabe (Koyo Katagiri) that Kazuma's father was killed by someone. The murderer was named Matagoro Kawai (Jinya Sato) who was the nephew of his close friend Jinszaemon Kawai (Isao Natsuyagi). He came to help Kazuma who is not good at swords and chase Matazaburo.
Mitamura Yuka is a normal, shy high school student. Except for the fact that she has psychic powers. When a new student with similar powers begins to show her skills, creating a force of psychic Nazi student enforcers, Yuka and her friends vow to stop her. But behind it all is a mysterious force that will put Yuka's powers to the ultimate test!