Ten years into her marriage, Reiko Kitagawa appears to have a smooth and successful life, both professionally and personally. However, she has grown emotionally distant from her husband, and their intimate relationship has faded. Betrayed when her husband has an affair, she finds herself returning to him as an unfaithful wife. After the intense sex they shared last time, she was brought to powerful, unforgettable orgasms—every touch, every sound of penetration lingering vividly in her mind. Deep within her heart, memories of past love remain engraved, and those emotions continue to stir even now.