Universal Century 0071. Three years have passed since the escape from Side 3's Autonomous Republic of Munzo. Casval and Artesia have fled to Earth along with Jimba Ral. They now live quiet lives under the names Édouard and Sayla. However, they are once again being targeted by the evil schemes of the pursuing Zabi family... Meanwhile, Side 3 has been renamed the Autonomous Republic of Zeon. They embark on the development of a new weapon called the mobile worker in order to resist the Earth Federation Forces.