Mother-Son Copulation: The Waterfall Journey of Mayu Mizukami - This exclusive digital release is a special edition featuring over 28 additional minutes of bonus footage not included in the standard version. The original version follows Kaede Sakuma, who gave birth during college and raised her son alone after divorce. When her son enters university, they embark on a hot spring trip together. As he becomes increasingly aware of his mother as a woman, he struggles to confess his feelings during their journey. Initially resisting, Kaede gradually gives in to her son's advances, surrendering to instinct as their bond deepens. Amid the tranquil atmosphere of the hot springs, their forbidden romance culminates in a one-night promise, leading to an emotionally charged climax that strengthens their connection.