Forty-year-old milf Sayaka (pseudonym) runs a karaoke snack bar after her divorce. Once an event promoter who married her husband and became a full-time housewife, her decade-long marriage ended due to his infidelity. After the divorce, she threw herself into work, laboring day and night, distancing herself from any romantic or sexual affairs. Now approaching the milestone of turning 40, she begins to crave intimacy and femininity once more. She confesses, "I'm an M woman—actually, I'm extremely submissive. I get turned on when strangers mistreat me." Seeking to rediscover pleasure after so long, she embarks on a journey with a man she's never met before. This trip awakens her true nature as a submissive woman, driving her headlong into a world of ecstasy. A mature love story where a voluptuous woman's charm intersects with the hidden desires buried within her soul.