Sumire Sakamoto plays a slender married woman whose sexual experiences—including with her husband—have involved five men in total. Yet she's never had an orgasm, unable to emotionally connect or truly enjoy sex, which always felt like mere performance. Constantly preoccupied with her partner's reactions rather than her own pleasure, she lived in emotional detachment. Driven by rising sexual desire, she turned to an affair website, searching for a new sexual partner to finally experience real satisfaction.