To retrieve her husband who suddenly disappeared, Ririka reluctantly participated in the 'Chikusho GP,' a competition for anal enthusiasts. Thrown into a dark, sealed basement, she was trained to win the title of best anal. Once the competition began, every detail of her anus—color, shine, number of wrinkles—was scrutinized. Ririka somehow endured these humiliating days, but her anus, despite her will, repeatedly reached climax...
