Mijukuna Kahanshin (1984)

AKA: 未熟な下半身, Immature Lower Body, 青涩的下半身, 青澀的下半身 | Directed by Nobuyuki Saitō | Country: Japan | Language: Japanese | 65 mins
Cast: Kotomi Aoki, Usagi Asō, Kiriko Shimizu, Bang-ho Cho, Miyuki Kamata, Seisaku Kimura, Rokurō Mochizuki, Junichi Sakurai, Ryôma Takemi, Aiko Yoshimoto
Subtitles : –

Synopsis (Google Translate)
Chihiro Yamazaki, a schoolgirl, meets Koichi Shiraishi, the editor of a gal magazine, and starts living together in a cheap apartment. Shiraishi had a wife, Tomoko, but due to Tomoko’s sex allergy, she left home and lived with Chihiro.
Chihiro gradually grows into a mature woman’s body with Shiraishi’s hands. On the other hand, Tomoko had a secret. It was that he had once slept with Shiraishi’s colleague, Kimura. Tomoko was so afraid of being found out that she was allergic to sex, but by accident Shiraishi found out about it.
When the secret is no longer a secret, something hot hits Tomoko’s whole body, causing her to writhe and drown in pleasure. With his wife’s allergies improving, Shiraishi has no reason to continue to leave home.
As Shiraishi leaves the apartment with a little luggage, Chihiro has one last sex as if saying goodbye…

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