Amate Yuzuriha is a high school student living peacefully in a space colony floating in space. When she meets a war refugee named Nyaan, Amate becomes involved in the illegal mobile suit dueling sport known as Clan Battle. Under the entry name « Machu, » she engages in fierce battle day after day, piloting the GQuuuuuuX. Then an unidentified Gundam mobile suit, pursued by both the space force and the police, appears before her, along with its pilot, a boy named Shuji. Now their world is about to enter a new era.