Forced to take drugs and losing consciousness, she wakes up to find her limbs completely restrained, her lower body exposed and tied to a chair. No matter how desperately she resists, there's no escape. In this helpless state, her anus is developed as a new erogenous zone. Pleasure that leads her to the peak of shame. Before she even realizes it, the hidden pleasure spots inside her anus are mercilessly stimulated by fingers and toys. The mix of humiliation and ecstasy overwhelms her, making her climax uncontrollably. She can no longer return to being an ordinary girl...