Nao, a beautiful wife who is troubled by her sexless life, witnesses her husband masturbating. Knowing that her husband, who hasn't made love to her for six months, is not impotent, she loses her confidence as a woman and also an outlet for her sexual desire. One afternoon, as she was rubbing her crotch, she looks up and meets her middle-aged neighbor, Shirai, through the window, who has come to greet her after moving in. The two, who were never meant to meet, end up in an affair so passionate that they end up sweating after witnessing each other masturbating...