Ryoko was soothing Tatsuya's body, who was tired from studying, in the bath every time she wanted to pass the exam for her only son, Tatsuya. One day, without warning, the bath in the house breaks down. Ryoko is surprised to learn that the gas man who came to repair her was Tatsuya's classmate, Nakajima. …. Mother and child she bathes with her again that evening. However, Tatsuya senses that Ryoko's behavior is unusual.

The eldest and youngest sisters, Junko and Rie, run the inn "Hamaya" in a rural town, but the inn is struggling financially. One day, Mayumi, the second sister, who had been missing, suddenly returns home...

After serving his sentence, Tachibana goes to the apartment where his ex-girlfriend used to live. There are yellow panties hanging out to dry on the balcony. Overwhelmed by the fact that she had been waiting for him, Tachibana buries his face in Sister Emi's (Orihara Yukari) chest as she opens the front door, and as he pushes her down forcefully, she screams. From the back, Reiko (Kayama Natsuko) and Kaori (Iori Ryoko) appear dressed in nun's robes, causing a commotion... The two girls make a living by using one room in the apartment as a "church," volunteering to contribute to the community during the day and running a nun's bar at night. Tachibana is dejected that there is no woman waiting for him and tries to leave, but the three girls stop him...

Mizawa remarries following a tragedy with his previous family. His new wife has a daughter, Mikayo. The three of them take a trip to Okinawa... [Exists in two versions : a R18+ version ("Hentai kazoku: Aoi umi ni idakarete") and a R15+ version ("Yearning no shima")]