Rina Uchimura is a woman engaged to her long-term boyfriend, yet troubled about their relationship. She exudes a refined, elegant charm with a stunning figure that gives her a sophisticated, almost celebrity-like allure. Having enjoyed daily sex since the start of their relationship, she's recently noticed a sharp decline in intimacy—now limited to just once a month—as their wedding approaches. Fearing she'll enter marriage having known only her fiancé sexually, she begins craving experiences beyond what she's had. Yearning for greater pleasure and new sensations, Rina opens herself up to unfamiliar sexual experiences, exposing her highly sensitive body in pursuit of fresh excitement.