Reika and his friends return to the base after the battle with Nergal. Around the same time, the Earth Alliance was catching the radio waves of Asena, the favorite machine of Reika's older sister (Rei Ame), who was missing. The 2nd AG unit will head to space to find its source. However, when he suddenly learned that a myriad of Nergal groups had appeared over the AG base, General Ray Burke ordered the emergency launch of the aircraft carrier Atlahasis. A flock of Nergal approaching the launch orbit of Atlahasis. I don't want to lose my loved one anymore-as soon as I escape from the gravitational sphere, Reika and his friends steer the G's frame and start their first space battle.