A young woman roaming the streets looking for comrades who keep vanishing one after another — this is Rio Sakamoto. Exhausted and out of leads, she gets a message from one of the missing. Not realising it's a trap, she works up the courage and walks alone into the Kokushikai office to rescue them. The men there get a drink laced with a powerful aphrodisiac into her, and she blacks out. What's waiting when she wakes is restraints and a forced-orgasm hell of pleasure torture. Toyed with by these men, her whole body turns unbearably sensitive — her pussy, and then her ass too, going off again and again. She fights it desperately, but the female instinct she'd kept asleep gets woken up, and body and mind both fall into pleasure beyond anything she imagined. What becomes of Rio in the face of the most brutal pleasure torture ever filmed?