Raw Production Pervert Treatment (1991)

Original title: ナマ本番 変態治療

A woman continues to question the sudden change in her mother's condition and death as soon as she was admitted to a major private general hospital. She thinks that the hospital is making money by drugging its patients and that her mother was a victim of this, so she becomes the mistress of the hospital's director and searches through the director's belongings during their rendezvous at the director's villa. On the other hand, she also gives her body to a man who was her senior at university and is now a talented psychoanalyst who has returned from the United States, and in return she asks him to get a job at the private hospital and expose the director's misdeeds. Of course, the doctor has another ambition and accepts the request. As their intentions intertwine, the story takes an unexpected turn...