Natsumi, a married woman, previously maintained a lifestyle involving multiple sexual partners until meeting her husband Shunji through a marriage agency. She deliberately abandoned that phase upon marriage, embracing the security of married life. Nevertheless, she occasionally contends with residual longings for her past experiences. Her stability fractures when Hayama, a former sexual partner, resurfaces as Shunji's friend. Identifying her vulnerability, Hayama exploits their shared history to blackmail her into resuming physical relations, leveraging her secret past to ensure silence. This compels Natsumi into covert encounters that simultaneously reignite long-suppressed physical urges and generate profound internal conflict between her marital commitment and resurfaced desires. Her development revolves around navigating this psychological struggle, born from the collision of her current identity as a wife and unresolved elements of her history.