Onihei Crime Files Special: Okatsu from Yamabukiya

The narrative centers around Heizo's cousin, Senemon Misawa, and his son, Katsuzo, who visit Heizo's home. Senemon has fallen for Katsutoshi, a woman working at the Yamabukiya Tea House, and has proposed marriage. Heizo's curiosity leads him to investigate Katsutoshi's true nature, prompting him to visit the tea house himself.

As Heizo interacts with Katsutoshi, he feels a mix of embarrassment and suspicion, leading him to send his associate Gorozo to further investigate. Gorozo employs secret detective Rihachi to keep a watchful eye on Katsutoshi, adding layers of mystery and tension to the plot. With a runtime of 96 minutes, the film offers a compact yet engaging story that delves into the complexities of relationships during the Edo period.