Amate Yuzuriha, a high-school girl living in the Izuma colony, meets a female courier named Nyaan.

Amate meets a boy named Shuji, who pilots the Red Gundam. She can’t forget the sensation of the glowing universe they experienced together and suggests forming a MAV to enter the Clan Battle. Amate decides to use the entry name "MACHU."

A super unicum known as the "Witch," who shot down over 100 enemies during the One Year War, enters the Clan Battle to settle an old score with the Red Gundam. Seeing this Witch, who clings to mobile suit combat even at the cost of abandoning her husband and child, Machu witnesses the depths of human obsession.

Machu plans to earn money in the Clan Battle and travel to Earth with Shuji and Nyaan. However, on the day of the Clan Battle, Machu is caught by Xavier. At this rate, the trip to Earth will remain just a dream. At that moment, Nyaan…

Annqi discovers Shuji’s hideout. Information about the Red Gundam is worth more than any Clan Battle prize money. Machu finds out that Annqi schemes to sell that intel during the Clan Battle. Earth Federation forces’ intelligence agency finds out about Kycilia’s top secret information decides to…

Upon learning of Annqi's plan, Machu devises a plan with Nyaan to use the Clan Battle as a means to help Shuji escape. However, their opponent in the next Clan Battle turns out to be a newly built mobile armor operated by terrorists aiming to assassinate Kycilia.

In the final stages of the One Year War, the Sodon Fleet led by Char launched to stop the Earth Federation forces' operation to drop Solomon Fortress; to protect the lunar city of Granada. Five years later in Granada. Nyaan was there with Kycilia.

Guided by a mysterious message, Machu escapes Sodon and descends alone to Earth in GQuuuuuuX. After crash-landing to Earth, she is rescued by a woman adored as “lady,” who is being held captive in the Kabas estate. Machu decides to escape with her and attempts to flee in the Core Fighter.

To stop Yomagn'tho from causing destruction, Machu takes on a mission from Challia Bull to rescue the girl of rose. However, Kycilia makes her move first. Nyaan’s mobile suit, the GFreD, begins activating the Zeknova cannon. Its target: all of humanity on Earth—

Machu's GQuuuuuuX fights against Nyaan's GFreD as she tries to rescue the girl of rose. Eventually, guided by Shuji, Machu ventures alone into the heart of Yomagn'tho. There, she meets Char and Kycilia.

This is the end game. A white mobile suit appears from the other side, attempting to kill Lalah. To Machu’s shock, the pilot of this White Devil is none other than Shuji. Determined to protect Lalah, Machu becomes a MAV with Nyaan and decides to fight Shuji.