Shihori, a married woman who is troubled at night, hears her neighbor talking about themselves on the phone. Feeling irritated and frustrated by this, she starts masturbating... When she climaxes, her gaze turns to the open window and the face of her neighbor. Shihori is angry, but her neighbor Mitsui explains that he meant no harm and that the phone call was about an unrelated couple. The two, who were never meant to meet, end up in an affair that becomes so intense that they end up sweating after witnessing each other masturbating...