By day a sharp female detective, by night a shadowy vigilante known as Sumikawa Miyuki. To expose corruption in the Siguria nation, she infiltrates the embassy, only to come face to face with Ranka, her former female instructor. Overpowered by Ranka's overwhelming strength, Miyuki is completely dominated, her joints dislocated and body subdued. Swept up in Ranka's emotional currents, she is led down a new and unforeseen destiny.