Chiharu was encouraged to join a tennis club to get some exercise, but she ended up becoming friends with her coach and ended up getting into a physical relationship with him because she had too much free time and sexual desire. With her husband away on a business trip, the frequency of their meetings escalates day by day. Unaware that they were being seen, she is threatened by the manager, and with a junior colleague she has feelings for, she enjoys sex with him and gets completely carried away by the pleasure, showing her lustful side.