Toshishita Chin Kui Oba-san

Akiko Furukawa, a 35-year-old unmarried woman, has a secret obsession with Shun, a younger man living in her apartment building. She masturbates to fantasies of him, struggling to suppress her intense desire. One day, she discovers a weakness in Shun, and her pent-up urges explode, leading her to attack him.

Shun, shy and terrified, initially surrenders to Akiko's advances. However, as he learns about the female body and pleasure, he transforms from a passive victim into an active participant. He becomes Akiko's prisoner, but also a man who shakes his hips and seeks his own gratification, following his primal instincts.