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 is drawn into an illegal mobile suit duel known as the Clan Battle. Under the codename "Machu", she engages in fierce battles day after day, piloting the GQuuuuuuuX. Then, an unidentified Mobile Suit Gundam appears before her, pursued by both the Space Force and the police, accompanied by its pilot, a boy named Shuji. Their world is now entering a new era.