Investigator Yuna follows the trail of a disappearance linked to the vicious Black Lion Society, only to be captured herself. Restrained and groped, she is dosed with the same drug she had been investigating and subjected to humiliation, assault, and wave after wave of forced pleasure. Her trained body fights back, but its involuntary reactions betray her as she is made to climax repeatedly until she passes her limits and becomes crazed with pleasure.