In the Universal Century year 0079, the space colony known as Side 3 proclaims independence as the Principality of Zeon and declares war on the Earth Federation. One year later, they are locked in a fierce battle for the Thunderbolt Sector, an area of space scarred by the wreckage of destroyed colonies.

When the Beehive II arrives at Anaheim Electronics' headquarters on the moon, the crew is shocked to see that the city's numerous domes are all part of an ambitious project developed by Io Fleming's father before his death--a project that could be humanity's last hope of restoring Earth's environment. But to defend his father's legacy, Io must use the only effective weapon against Daryl Lorenz and the Psycho Zaku, the Psycommu-equipped Perfect Zeong, a weapon as likely to destroy its own crew as it is the enemy...