Munako and Hitomi, housewives who are neighbors and often interact with each other. One afternoon, the two were casually chatting over tea when Munako said, 'My old knee injury hurts when it gets cold.' Hearing this, Hitomi began to massage Munako's body, saying, 'I'll give you a massage.' Seeing Munako's face react to the pain and pleasure, Hitomi became aroused and impulsively kissed her. Although Munako was confused, Hitomi tried to continue, but her husband came home, so she left, saying, 'See you next time.' From that day on, Munako also began to feel restless...