Gifu no kyûai: Yawahada o hau shita (2012)

A middle-aged man tells an old story to an 18-year-old schoolgirl, Tatsuko. He is Tsuyoshi, a high school teacher who is staying with Inoko, the owner of a dried fish store. Seduced by Inoko, who has no husband, they have intense sex every day.... One day, while strolling along the beach, Tsuyoshi sees a strange woman in a school uniform, Naomi, and cannot forget her. He is perplexed when he learns the reason why she was so used to men in the past. Tatsuko smiles when the man tells her about Naomi and Tsuyoshi. What is their complicated relationship?