In the year 2167, a burst of radiation from the supernova of nearby star Hydrus Beta devastated Earth, killing millions. By 2356 humanity had united to rebuild its world and prepare for the supernova"s next assault.
To shield planet from future peril, Foundations were erected across the Solar System. Serving as hubs of learning and exploration, one such Foundation—the Stellvia—draws Shima Katase, who defies her mother"s objections to enroll as a trainee, yearning to witness the cosmos.
At Stellvia, Katase hones piloting skills and seeks selection for Mission tasked with protecting Earth from the impending wave. Though she wrestles with training, she gradually evolves into someone capable of defending humanity. The Foundation"s curriculum blends physics with survival tactics, while mentors guide cadets toward mastery. As the second wave approaches, Katase"s resolve is tested by simulations that mimic the lethal radiation burst, forging into a leader who may command fleet that will shield Earth from annihilation.