Working wife Eri lives a busy yet ordinary daily life. One day after work, she falls ill and collapses by the roadside. By chance, a salaryman named Matsuki notices her and kindly tends to her. His tenderness brings her a warmth she has never felt from her husband, deeply moving Eri and making her long for a reunion with him. Eventually, the two meet again and their relationship escalates into a passionate affair. However, her husband remains completely unaware, as Eri's heart becomes entirely consumed by Matsuki.