VOYEUR DIARY OF A FEMALE DOCTOR (1992)

Yusaku, an obstetrician and gynecologist, marries Chisato, a female doctor. Yusaku is an abnormal photography enthusiast, and is not satisfied with just taking pictures of Chisato nude, so he secretly installs a video camera in her examination room and secretly captures the patient's embarrassing state... Snack's mom, Rika, likes Yusaku, so even though she's not particularly bad, she often comes to see him. Yusaku asked Chisato to take a picture of him. The two enjoyed sex while watching the video. Meanwhile, when Rika learns that Chisato is Yusaku's wife, she becomes jealous of her and begins to take revenge on her husband...