Earth's new Hyper-Solar System is being sabotaged by aliens who have tried invading the planet before. Furuhashi, now the Captain of Ultra Guard, must investigate, and an old friend has returned to Earth to help.
The alien Metrons have returned, this time offering an idealistic scientist a chance to turn Earth's pollution into a new home for humanity. But just like before, the Metrons have a hidden agenda which could destroy all life on Earth.
