Amate Yuzuriha is a high school student living peacefully on a space colony floating in space. When she meets a war refugee named Nyaan, Amate is drawn into the illegal mobile suit dueling sport known as Clan Battle. Under the name "Machu," she throws herself into fierce combat day after day, piloting the GQuuuuuuX. Then, an unidentified mobile suit Gundam pursued by both space forces and the police appears before her, along with its pilot, a boy named Shuji. Now their world is entering a new era.