A mysterious comet traveling to Earth's solar system is not what it seems. Without Captain Avatar, Derek Wildstar leads the Argo (Yamato) against a new enemy.

The year is 2201, and the Gamillas Empire has been defeated in war. Planet Earth has entered a new age of militarization, with military spacecraft in production. The "Yamato" responds to an SOS signal by the mysterious woman Teresa. The Gatlantis Empire uses the rescue attempt as a pretext to attack Earth. Desler, the defeated leader of the Gamillas, has launched his own revenge scheme. The scene is set for conflict on multiple fronts.—Dimos I