Kanae started learning ballroom dancing because she rents out her house for dance lessons. She encourages her husband to take up the challenge, but he doesn't pay her any attention, so she's been feeling a little lonely lately. One day, when the instructor, Hirai, takes advantage of an opportunity when they're alone and pushes her down... Since it's been a long time since they've had sex since their marriage, her body doesn't listen to the stimulation that penetrates the depths of her vagina, and she just enjoys the pleasure. And then the day of the lesson comes again...