Investigator Natsuki, determined to protect her junior partner, goes undercover to infiltrate a grotesque pleasure cult involved in human trafficking. However, her mission is compromised and she is captured. Subjected to relentless pleasure interrogation, she endures unceasing torment. Forced onto a triangular wooden horse with a dildo inserted anally, she is brought to climax repeatedly by the vibrations of an electric massager. Further tortured with finger stimulation to her A-spot and drill torture, Natsuki is ultimately driven to complete psychological collapse.