Kidou Senshi Gundam: GQuuuuuuX - Beginning

Amate Yuzuriha lives an ordinary school life inside a space colony until she meets Nyaan, a refugee whose presence draws her into Clan Battle, an illegal sport where mobile suits fight for money and reputation. Using the name Machu, Amate climbs into the cockpit of the GQuuuuuuX and discovers a thrill that her quiet life never offered.

Then an unidentified Gundam appears, pursued by both military forces and police. Its pilot, Shuji, is a boy carrying secrets large enough to disturb the colony's fragile order. Amate's new world of underground duels collides with a much older conflict, and the battles she entered for excitement begin pulling her toward history on a far greater scale.