Kanon is trapped in a creepy room wrapped in black cloth when passing-by Koharu discovers her, finding her in the dangerous situation of having her anus destroyed. Amid fear and tension, a fucking machine thrusts into her anus, engulfing her in continuous, intense pleasure. The machine's direct anal stimulation creates relentless orgasms that feel as if they will last forever. The theme of pursuing lesbian pleasure further enhances the allure of this work.