A beautiful fifty-year-old married woman named Mio purchases a sailor uniform in hopes of improving her stale relationship with her husband. While trying it on, her neighbor's son Satoru visits. Struck by his lustful and endearing appearance, she notices that he has become aroused. Mio teasingly invites him to indulge in her mature charms, exposing herself and encouraging him to pleasure both their bodies. They engage in a shameful union filled with passionate desires.