Agent Mao Kurata was conducting an undercover investigation at a trading company when she fell into a clever trap and was taken prisoner. The man, fed up with Mao's endurance during the interrogation, even after being given prohibited substances, hired a professional torturer to subject her to even more brutal pleasure torture. Swallowed up in a whirlpool of overwhelming pleasure that she could not resist, Mao eventually lost her sanity and became a beast devouring only pleasure.