In her sleep, Nanako is fitted with a special suit which enables her to be a war machine. She can fly, shoot rockets, and fire bullets with the suit. She awakes to find herself in an exhibit showcasing the suit she is wearing. During her display, in which only Satsuki can control, she is stopped by a robot named Griffith, which also destroys tanks and people in the process. Inside, a man named Alan Mizuki claims she is a cyborg named Nana-Go, which was shown to him by Dr. Ogami in their early days in college together...