After Earth was ravaged by a deadly radiation wave triggered by a supernova in 2167, leading to widespread devastation, humanity now faces the looming threat of a second wave in 2356. To safeguard against this impending catastrophe, colossal space colonies named 'Foundations' have been constructed across the Solar System, serving as hubs for knowledge and exploration. Enter Shima Katase, who defies her mother's wishes to enroll as a preparatory student at the Stellvia Foundation, driven by her dream of witnessing space firsthand. Immersed in pilot training at Stellvia, Katase aspires to join the elite team for the crucial 'Great Mission' tasked with shielding Earth. Balancing the rigors of pilot education and navigating complex social dynamics, she undergoes a transformative journey, emerging as a potential savior of humanity.