母が性獣になった理由(1996)

Yoshie, the mother and manager of popular idol Yuki Udagawa, is one of the most successful people in the industry. Yuki is tied down by her mother's tight schedule and has no time to go on dates with her boyfriend Toru. One hot and humid summer day, Yuki finally decides to have a secret rendezvous with Toru at his villa, under the pretense of practicing a new song.