In a life with nothing lacking, a mother accidentally discovers a MILF magazine in her son's room, catching her eye. From that day on, she begins to see her son as a "man," and through their first intimate encounter, she discovers pleasure. Alone together, an urge grows within them to bind their hearts and bodies ever closer. Secretly leaving her husband behind, she embarks on a trip to Kamakura with her son, where on a quiet, deserted stretch of Shonan beach in the dead of winter, they draw their bodies close, wrapped in warmth and passion. The bond between mother and son evolves into a new, deeper form.