Erina's secret diary reveals her wildly daring life as she indulges in phone sex daily. One day, a door-to-door salesman suddenly arrives at her home, and she becomes fixated on the condom he carries. Tormented by desire and irresistibly drawn to the man, the married woman gives in to temptation, chasing pleasure without restraint. The scene unfolds with her rocking her hips, unable to hold back, climaxing repeatedly in intense ecstasy.