Suletta Mercury ventures from her home world to enroll in the Asticassia School of Technology, where conflicts are settled through student duels. The prestigious title of top duelist comes with a unique prize—Miorine Rembran's hand in marriage, a decision made by Miorine's father. When Guel Jeturk, the school's ace pilot and Miorine's current fiancé, insists on their union, Suletta challenges his authority. Despite winning the duel, Suletta's victory is tainted by accusations of piloting a forbidden Gundam-like mobile suit, known as a GUND-ARM. In a bid to uphold justice, Miorine proposes a higher-stakes rematch, forcing Suletta to secure another triumph to avoid expulsion and save her cherished Gundam Aerial from destruction.