In 2057, androids have established the Droid Empire, slaughtering humanity. Amid the chaos, engineer Dr. Yamahori works desperately to save mankind by developing a revolutionary program called Rapture 109. Meanwhile, General Asbestos, the Empire's supreme commander, travels back 50 years in time to assassinate the young Yamahori. To avert this crisis, Yamahori sends back MISAKI, an android implanted with an emotional love program, to protect his younger self and ensure the survival of humanity.