In order to find her husband who had suddenly disappeared, Ririka reluctantly joined the anal connoisseurs' event, the Anal Evaluation Meeting <Animal GP>. Thrown into a dark, sealed basement, Ririka was trained to win the title of the best anal. Once the evaluation began, every detail of the anal, including its color, luster, number of wrinkles, and even the smallest corners, were meticulously checked. Although Ririka somehow endured these days filled with humiliation, her tormented anal repeatedly reached climax against her will...