Sakai and Koharu Shizuki are a couple. One day, Sakai goes to her house and meets her mother, a busty mother named Ayu Anzai, who excites him. While borrowing the restroom at her house, Sakai witnesses Ayu masturbating while calling out his name and pretending to be Koharu. Unable to contain his excitement, Sakai masturbates with his erect dick, but Ayu finishes first, leaving him unsatisfied. Sakai can't get this encounter out of his head and starts pursuing Ayu. .
