This was one of Nikkatsu's Roman Poruno (Porn) series movie. Junko Miyashita who was one of the star of the series plays the lead. As often is the case with the movies of this series, the story reflects the underbelly of the society, but with humor.
Shimako (Junko Miyashita) is a mistress of Junichiro. She's also a housekeeper at his house. Junichiro is promising Shimako that he'll get a divorce, and marry her, but he's not taking any actions. Shimako learns that Junichiro's wife is pregnant again despite his word that he's not having sex with her. She goes to the apartment of the Osamu who tried to rob her at home, and asks him if she can live with him. She shacks in with him, but his girlfriend Tokiko (Ako) shows up. They come to an amicable solution that Tokiko will temporarily move to Shimako's apartment. Not knowing that this has happened, Junichiro mistaking Tokiko as Shimako, tries to have sex with her. Shimako has offers to match make her with respectable man, but she still can't forget Junichiro. Shimako, Osamu, and Tokiko comes up with a plan to kidnap Junichiro's daughter.
This kind of unusual and confusing relationship is often depicted with humor in this series (Especially the ones staring Junko Miyashita). What would otherwise be a tragedy in western movies, never turns out that way in this series. This is probably the reason why this series still garner fans after all these years. It's also a reflection of Japanese culture of the '70s and '80s. This movie is no less reflective of the society as Anjiro Ozu's "Tokyo Story" , and is a precious relic from the '70s Japan.
Although, not made to be an artistic movie, the high ratings of this movie shows that it hits chords with its viewers. This can be said about many other movie from this series. It's recommended that many Roman Poruno series movies be watched as possible to understand the culture of this series, before forming opinions about any one of its movies.
