Apartment Wife: Secret Research Society.

During their honeymoon, Koichi and Junko were attacked in a train toilet. From that day on, their sex life with Koichi did not go well, and even after they returned from the trip, Junko continued to live an empty life. Junko, who lives in a noisy housing complex, is concerned about what others think, but she tries her best to get her life back together with her husband. However, Koichi, whether he knows what happened on the trip or not, looks at Junko with cold eyes for some reason. Just as Junko is getting tired of this life, Masako, who lives next door, asks her to come over. Junko is quiet and doesn't get along with Masako, but she shows up to play. There, the housewives from the neighborhood have gathered and started chatting. The conversation escalates, and in the end, she even puts on a blue film and masturbates. Junko faints as she remembers what happened on the train...