Professor Zark deceived Dr. Zenmeiji, a renowned robotics expert, into manufacturing the combat android Psycho Gilder. His conspiracy deepens as he captures and ultimately murders the doctor's daughters—Sayaka, Rumi, and eldest daughter Mari. Facing utter despair, the doctor designs Mirai, an ultra-high-performance android equipped with a superior computer system capable of surpassing Psycho Gilder, in a desperate bid to stop Zark's plans. However, Mirai is constructed using parts from the Zark Foundation, leaving her with an incomplete justice circuit and vulnerable to the effects of Zark's control flute. To save her father, Mirai-Doll Mari appears—an android modeled exactly after the eldest Mari—attempting to initiate the Mirai transformation. Yet she suffers under the sound of Zark's hypnotic flute. Mari falls into a lustful state, succumbing to the lewd assaults of Androidman, but amidst the depraved moans and wet "pichapicha" sounds, the flute's influence begins to fade. Seizing the moment, Mari screams, "Now! Change Mirai Switch On!" and engages Psycho Gilder in battle. However, Mirai-Doll Mari is trapped by Zark's dirty tricks and ultimately defeated by Psycho Gilder. What fate awaits Mirai-Doll Mari now!?