Ayako and her husband were struggling with their inability to have children. Aware of her age, Ayako felt she was nearing the end of her fertility window. Around this time, she was introduced to Tayori by her husband and found herself drawn to him, captivated by his wild, masculine charm. Gradually, her attraction deepened, and their affair intensified with each ovulation cycle. One day, during a dinner gathering between the couples, jealousy and lust flared between the women, quickly escalating into a heated scene of infidelity. As a result, their relationships took an even more complicated turn.