Gundam Reconguista in G

R.C. 1014: A mysterious mobile suit, G-Self, is being pursued by a group of space pirates and the Capital Guard. The suit is captured by the pirates and the pilot of the suit, Raraiya Monday, is captured by the Capital Guard. A week later, a class of Capital Guard Academy cadets are riding a Crown transport module up along the orbital elevator, Capital Tower, to reach space where they can conduct their first live mobile suit training. On the way up their Crown is attacked by space pirates and their mobile suits, one of which is the G-Self. Bellri Zenam, the youngest of the cadets, pilots a maintenance mobile suit to hold off the G-Self and helps capture the pirate suit as well as its pilot, Aida Surgan.

Capital Territory is attacked by a squadron of space pirate mobile suits led by Cahill Saint, who wants to rescue the captured Aida. Bellri and his friend Noredo manage to rescue Aida as the structure she was being held in was damaged during the attack. Tasked with piloting the G-Self to repel the pirate attack, Bellri kills Cahill in an act of self-defense as Aida watches.

Piloting the Montero, space pirate ace pilot Klim Nick tries to once again assault Capital Territory in an attempt to rescue Aida from its clutches. As the battle breaks out, Bellri, Aida, Noredo, and Raraiya happens to be in G-Self's cockpit while testing their abilities to pilot the mobile suit. Aida succeeds in wrestling control of the G-Self from the others, who remain in the cockpit as she escapes from captivity with Klim.

Klim and Aida return to the space pirates' mothership, the Megafauna, with the G-Self, along with Bellri, Noredo, and Raraiya, who are held hostage. Meanwhile, the Capital Army, the Capital Territory's new military, is officially unveiled to the public and its first mission is rescuing the hostages from the Megafauna. Bellri, wanting to protect Noredo and Raraiya, pilots the G-Self to put a stop to the fighting, but ends up being forced to defend himself from the Capital Army mobile suits and he successfully repels their attacks.

The Capital Army unveils a new mobile suit, the Elf Bullock, piloted by the mysterious Mask who leads a team to once again attack the Megafauna. After having gained the trust of the Megafauna crew, Bellri promises Aida that he will protect the ship in order to make up for his killing of Cahill, and he once again helps fight off the attacking Capital Army mobile suits. However, Bellri and Noredo reveal that they are secretly spying on the pirates and have a plan to escape with the G-Self.

The Megafauna launches into space in order to create a distraction for the assembling Amerian Space Fleet. Dellensen Samatar, Bellri's old instructor at the Capital Guards, pilots an Elf Bull to lead a squad of mobile suits to try to rescue Bellri. Unbeknownst to Dellensen, the G-Self is actually being piloted by Bellri, and the two engage in combat. The two eventually discover each others' identities, but it is too late as Bellri shoots Dellensen's Elf Bull down, killing his old instructor in the process.