In a quiet rural town, widow Itsuki lives a lonely life. Her son returns home after a long absence, stirring emotions deep within her. Time has passed, and her son has grown into a handsome man. Overwhelmed by the loneliness of losing her husband and her growing feelings for her son, Itsuki begins to see him as a man. Unable to suppress her desires, she reaches for her son's penis. Hesitant at first, he eventually gives in. Before long, the two begin satisfying their carnal urges through the act of defecation. The son catches the copious feces twisted out from his mother's anus, and their forbidden bond grows ever deeper.