Amate Yuzuriha is a high school girl living peacefully on a space colony floating in space. When she meets a war refugee named Nyana, Amate is drawn into the illegal mobile suit dueling sport known as Clan Battle. Under the title of her entry "Machu," she throws herself into fierce combat day after day, piloting the GQuuuuuuuX. Then an unidentified mobile suit Gundam appears before her, pursued by both the Space Force and the police, as well as its pilot, a boy named Shuji. Now their world is about to enter a new era.