Mother-Son Copulation ~Koshin Naka-Sato Road~ Special Release Edition is an exclusive release featuring special footage not included in the standard version. The original story follows Emiko, who divorced her husband ten years ago and has since raised her son Tatsuya alone. Tatsuya has finally secured a job and is planning to live independently starting next April. One day, he invites Emiko on an onsen graduation trip, and the two embark on a private getaway together. There, he suddenly confesses, "Mom, thank you... I've always loved you..." His words shake Emiko to her core, and the thought of living apart after this trip becomes unbearable. Amid a warm and tender atmosphere, mother and son cross the forbidden boundary, giving rise to a new and intense emotional connection.