Gundam Lfrith has not yet managed to meet the conditions imposed by the council, and test pilot Elnora Samaya is growing impatient. That same day, her daughter is celebrating her fourth birthday.
17-year-old Suletta Mercury transfers to the Asticassia School of Technology to train with her Gundam Aerial when she comes across a young woman named Miorine Rembran.
Suletta is forced into a rematch against Guel to prevent her expulsion from school and the Aerial from being scrapped. To ensure his victory, Vim equips Guel's mobile suit with an AI auto-pilot, ignoring his son's desire to win on his own.
Everyone is shocked by Guel's sudden proposal, including Suletta who panics and rejects him. After failing an exam, Suletta asks the students of Earth House to be her support crew, but the Earthians are apprehensive to help a Spacian.
Elan is ordered by the leaders of Peil Technologies to investigate Suletta and the Aerial. Elan believes Suletta is like him, and when he invites her to spend time with him on their day off, their fellow classmates interpret it as a date.
Suletta is unable to get in touch with Elan, which has her worried. When the Benerit Group invites her to an incubation party, she goes hoping he'll show up. Miorine accompanies Suletta to the event and has a tense encounter with Prospera.
GUND-ARM, Inc. has been launched and Miorine recruits the members of Earth House as employees. Due to its hasty creation, the company's mission has yet to be decided, prompting the group to debate the ethics of selling Gundams as weapons.
A sudden change to the school's startup regulations puts a halt on the progress of GUND-ARM, Inc. Suspecting Shaddiq to be behind the changes, Miorine challenges him to a duel with the fate of the company at stake.
It's been two months since the duel with Shaddiq. The GUND-ARM, Inc. team is busy testing their prosthetic work while Miorine is away on a business trip. Suletta begins to question if her bond with Miorine is real.
Earth House travels to Plant Quetta to pick up the Aerial. A series of misunderstandings and her own insecurity causes Suletta to believe that her friends think of her as useless and unreliable. The facility is attacked by hostile forces.
