A forbidden relationship with a married woman from your part-time job—something everyone has imagined at least once. A man who had grown accustomed to hearing the daily complaints of part-time housewives finds himself alone with Riuho once again. During their usual conversation, she confesses she's been "watching him," then suddenly kisses him. Shocked, he quickly gives in, and they immediately have sex. From that moment on, they seize every spare moment to meet in secret. Despite the guilt, they become utterly consumed by the pleasure. This illicit romance, hidden within their everyday lives, steadily draws their hearts closer together.