Mariko, the married woman next door, suddenly shows up at the apartment of Yamashita, a boring single man who lives alone. It seems that she ran away from home after a fight with her husband over his infidelity. Understanding the situation, Yamashita decides to hide Mariko for a while, but... Yamashita, who has suddenly found himself living with a beautiful wife he has been interested in for a long time, cannot contain his excitement at this unexpected turn of events and follows Mariko to the bathroom, sneaking a peek into the dressing room...