In Regild Century 1014, 1,014 years after the end of the Universal Century,[2][3] a young member of the Capital Guard named Bellri Zenam (ベルリ・ゼナム, Beruri Zenamu), charged with protecting the orbital elevator Capital Tower,[1] encounters and helps capture a highly advanced mobile suit, the G-Self and its pilot, Aida Surgan (アイーダ・スルガン, Aida Surugan), while defending the tower from space pirates called the Pirate Corps.

Feeling a connection with both the G-Self and its pilot, Bellri is able to control the mobile suit, operable only by a select few.

The Megafauna returns to the Capital Territory to negotiate a ceasefire and alliance to prepare for an alleged threat from space, but the unexpected launch of an Amerian fleet causes hostilities to resume.

In the ensuing chaos, the Megafauna as well as a pair of Amerian and Capital Army ships journey to the Moon.

At Towasanga, Bellri and Aida learn that they are the last surviving members of the royal Rayhunton family, sent to Earth as children to protect them from the Dorette Fleet.

Seeking the truth behind the conflict, Aida commands the Megafauna to the Venus Globe colonies, the source of the Photon Batteries and other advanced technology that has led to Earth's rapid militarization.

After a battle with the G-IT Corps—another faction supporting the Reconguistra—they discover Cumpa Rusita is the Towasangan who brought them to Earth and provided Earthnoids with the blueprints for spaceships and mobile suits with the intention of spurring armed conflict and strengthening the human race.

A chaotic final battle ensues at the Guiana Highlands among the remains of the past wars and Cumpa Rusita is killed in the crossfire between Bellri and Captain Mask.

Having rediscovered the horrors of war throughout their adventures, the crew of the Megafauna force a ceasefire with technology from the Universal Century.

Some months later, a joint crew of Earthnoids and Spacenoids from multiple nations start a journey around the world to promote peace and understanding.

[7] Previously, in November 2010, Tomino had previewed an unfinished novel in the 100th issue of Gundam Ace called Hajimetai Capital G no Monogatari (はじめたいキャピタルGの物語), which revolved around a space elevator with similar characters and settings.

A manga adaptation of the show by Tamon Ōta was serialized in Gundam Ace magazine from October 2014 to November 2019 issues, when it went on hiatus.

In Mobile Suit Gundam Extreme Vs. Force PlayStation Vita game, the G-Self is a playable unit.

[20] Both of the units also appear on the Arcade Game Mobile Suit Gundam Extreme Vs. Maxi Boost ON and later supplanted by the G-Arcane with the full dress and G-Self again with the Perfect pack.

He went on to state that it reflects the dilemmas that humanity faced in the 20th century, and how technology and digital age culture has made us lose our ability to perceive and understand these detached realities.