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