Universal Century 0153. 17 years have passed since the "Steel Seven" defeated the remnants of the Jupiter Empire. As a new conflict brews between a Side 2 faction known as the Zanscare Empire and the League Militaire/Earth Federation. A high schooler on Side 3, Font Baud, is hunted by Zanscare special forces when he discovers their secret Newtype weapon. However, he encounters a little girl, who is accompanied by a blind man and is rescued by the strange return of a mobile suit that defeated the Jovians.