Arafō rikonzuma: Kuwaete shisshin (2009)

Akane, the owner of a popular beauty salon, has a daughter, Aiko, who is a college student. Akane has been married and divorced many times, and enjoys loveless sex with men. Then, Akane learns from an employee, Rika, that she had a sex experience with her husband that was so good she fainted. Akane tries various positions, but... Aiko introduces her mother to Katsuragi, a professor at her seminar. What will become of the two people who are attracted to each other?