It is the year 0083 of the Universal Century. The rebellious Principality of Zeon has been defeated in the One Year War by the Earth Federation. However, a faction of Zeon remnants led by Aguille Delaz fled from the final battle, hiding themselves away. After three long years, they attempt to rise up once more, sending Delazs ace pilot, Anavel Gato, to infiltrate a Federation research base to steal one of two secretly developed prototype Gundams along with its deadly nuclear warhead.