In order to bring back her husband who suddenly disappeared, Ririka reluctantly participated in the anal evaluation meeting <Animal Anal GP>, where anal enthusiasts gather. Thrown into a dark basement, Ririka was trained to win the title of the best anal. As the evaluation began, the color, luster, number of wrinkles, and every corner of the anus were checked. Although Ririka somehow endured those days of humiliation, her anus, which was constantly tormented, repeatedly reached orgasm against her will...