Matsuzaka Harumi is a 38-year-old housewife. Her husband has been repeatedly going on long business trips, and while he used to call her frequently from the road, he recently stopped contacting her altogether. Growing anxious about the situation, Harumi began to suspect he was cheating. Holding onto this worry, her son Tatsuya also starts saying, "Dad is having an affair." That night, overwhelmed by loneliness, Harumi seeks emotional fulfillment through her own body. Hearing her aroused moans, Tatsuya suddenly rushes in and embraces her. At first, Harumi resists, but her pent-up desires and isolation soon take over, and she gradually surrenders to the sensation...