The story follows high schooler Amate Yuzuriha, who fights in illegal Clan Battles using her Gundam. However, the emergence of the Red Gundam brings drastic changes to the world.

Amate is introduced to an illicit world of underground mobile suit fights, and her life takes another turn when she and Nyaan encounter Shuji Ito, the enigmatic pilot of the coveted Red Gundam ...