Mother-Son Copulation ~Journey to Shozu Salt Road~ Special Exclusive Edition is a limited version featuring exclusive footage not included in the standard release, such as additional scenes and masturbation sequences. The original story follows a mother who, after divorce, raised her son alone. Now grown and employed, the son takes a vacation, and they decide to go on a hot spring trip together. During the journey, the son's feelings for his beautiful, proud mother gradually twist into something forbidden. "I love you, Mom..." he suddenly confesses, leaving her shaken. Unable to hold back, he advances on her. In the throes of pleasure she never expected, she realizes she may have secretly desired this too. As their mutual desires awaken, a taboo relationship blooms between mother and son at an onsen inn in Shozu. This film depicts the illicit, passionate encounters of a mother and son consumed by shared lust.