Mai Fuyuki has been married for 15 years, living a quiet and stable daily life. However, her intimate relationship with her husband has nearly disappeared. Even on the rare occasions they are intimate, she never feels satisfied, leaving her emotionally unfulfilled. On a trip with friends, she lies to her husband and secretly seeks physical pleasure for the first time in a long while. What she truly desires is intimacy with a man other than her husband. Her sensitive body reacts intensely to even the slightest stimulation, and as she surrenders herself to a stranger, she is overwhelmed by unprecedented pleasure. Fingers, tongues, and toys are no longer enough—she craves penetration by a man other than her husband, plunging into a passionate, uninhibited affair. In this new relationship, she releases all the longing and dissatisfaction she could never express within her marriage.