Nanami Hirose is a married woman whose daily life as a housewife is filled with an insatiable sexual desire. With endless free time on her hands, she regularly indulges in masturbation, yet a growing craving for more intense stimulation begins to stir within her. One day, she seduces a young man who comes to visit, and the two quickly become passionately involved. Though initially tormented by guilt, this encounter becomes a turning point, driving her to explore her deepest desires more boldly. As their affair progresses, her emotions are gradually shaken, awakening a powerful wave of new lust and longing.