Elegant mature beauty Miyuki stands behind a bar counter. Smitten at first sight, younger man in a suit, Miura, approaches her and they naturally grow close, ending up in a hotel together. However, noticing Miyuki's uneasy demeanor, Miura flees the scene. Six months later, Miyuki works as a cleaner at a company where Miura is employed as a regular staff member. By chance they meet again, gradually rekindling their bond until they finally cross the line once more. From then on, until 5 PM when her husband returns home, they secretly continue their affair.