Risa lives with her husband and their son, Takashi. Lately, her husband has been busy with work and comes home less often, leaving Risa and Takashi alone together more frequently. One day, while folding laundry, Risa notices Takashi's underwear. The moment she picks it up, she begins seeing Takashi as a man. Though she knows it's wrong, her loneliness and pent-up desires grow stronger—until finally, Risa gives in...