During the first deadly battle between Gaia and Agul, Xuanyuan Long, a meteorology PhD, is accidentally caught up in the conflict. On the brink of death, Earth’s sky consciousness awakens and grants him the firmament particles to transform into Aether Ultraman. After forcing his way into the battle between the two Ultras, he is reassigned to XIG following an accident at the aerial monitoring station. GUARD’s top brass secretly launch the “Firmament Monitoring Plan,” hoping to control Ultraman’s power.