Private detective Asuka bears a past trauma of being raped by a serial rapist, but overcoming this, she developed a powered suit and continued her activities as the beautiful masked heroine Sexyia. Sexyia's crusade against sex offenders gained covert attention, and in the underground world, a 10 million yen bounty was placed on anyone who could rape her and release the images. Unfazed by the threat, Asuka laughed defiantly and refused to stop her mission. But her enemies weren't limited to men. Kunio Ryuzo, a rapist leading a network of assailants, manipulated the lesbian sadist Makoto Himekawa to get close to Asuka. Ultimately, they succeeded in stealing Sexyia's transformation stick. With the device in hand, Makoto captured Asuka and cruelly tormented and violated her helpless body.