Sakura, a married woman living in an apartment complex, is frustrated by her husband's lack of sex, likely due to his busy schedule. In an attempt to soothe her loneliness and frustration, she frantically comforts herself. Just as she reaches ecstasy, she feels someone looking at her, and when she turns to the window, there is a delivery man. The two, who were never meant to meet, end up in an affair that becomes so intense that they sweat after the man witnesses her masturbating...