Investigator YUNA and her partner Takahashi infiltrate the hideout of a criminal syndicate trafficking illegal aphrodisiacs. When Takahashi is caught just as they are about to secure evidence, YUNA trades herself for him and is imprisoned for pleasure torture. She manages to escape and returns to the hideout with Takahashi, but the ordeal is not over. Overwhelming stimulation makes her lose bladder control and climax repeatedly, while her captors mock the proud investigator as a shameless masochist.