Mobile Suit Gundam U.C.0096 - Last Sun

In U.C. 0096, a ceremony to commemorate the end of the One Year War is held in Side 7. The Aonbarr, built to resemble the famous White Base is present at the ceremony, having transported junior high school students from Earth for the ceremony. Sun Place, one of the students who quickly becomes bored with the ceremony, enters a restricted access area, and encounters the three MS built for the ceremony, the G-First, Cannongan, and GF-Tank. At the same time, Zeon remnants on the Musai-class "Mailmer" attack, hoping to secure the Aonbharr as a trophy and join the Neo Zeon remnants known as "The Sleeves".

In Universal Century 0094, a live exercise for the MSN-001X Gundam Delta Kai is being carried out in outer space. This mobile suit is equipped the "NITRO System" that grants regular pilots the abilities of a Newtype. While the Gundam Delta Kai displays overwhelming power, a side-effect causes the test pilot's personality to become more aggressive. Back on Earth, the Earth Federation Forces aggressor squadron "Raven Corps" arrives at the Federation Forces Mariana base. Brothers Braier and Ing Ryude, who are pilots stationed at Mariana base, participate in a mobile suit mock-combat exercise with the Raven corps. During the exercise, the brothers are attacked by the Raven corps using live ammunition. Piko Altidore, captain of the Raven corps, reveals the object of the attack is the Gundam Delta Kai stored in "Area X" of the Mariana base. During the battle, Ing boards the Gundam Delta Kai to defend the base against the Raven corps' assault. However, the NITRO system brings about a berserk state in Ing, causing him to attack both allies and enemies. Piko manages to subdue the Gundam Delta Kai with a pulse grenade and opens a communication line with Ing. After this exchange, Ing seemingly joins the Raven Corps and departs the Mariana base in the Gundam Delta Kai.

In A.G. 101 (the 101st year of the Advanced Generation calendar) a mysterious entity known only as "UE", or "unknown enemy", attacks and destroys the space colony Angel. This brutal attack becomes infamous as the "The Day the Angel Fell", and marks the beginning of humanity's war for survival. The series begins in A.G. 108 when the UE attack the space colony Ovan, where Flit Asuno now lives after he escaped colony Angel before its destruction. Flit's mother shortly before she is killed by the UE, she gives her son an object called "AGE Device". Within it he discovers the blueprints for a powerful weapon from the past—the ancient messiah named "Gundam." From these blueprints, Flit spends the next several years studying engineering at an Earth Federation base on the Nora space colony and designing the Gundam AGE-1. Seven years later, in A.G. 115, Flit completes the Gundam AGE-1 Normal, just as the UE attack Nora, and make use of it to aid the crew of Federation's battleship "Diva" in evacuating the colony's citizens before it is destroyed. Determined to bring the battle to the U.E. for destroying his home twice, Flit agrees to serve at Diva's mobile suit squad piloting the Gundam. After obtaining enough data and military power to establish a course of action, the crew of Diva and their allies launch a sucessful attack that destroyed the U.E.'s secret fortress in the Ambat asteroid. There they learn that the U.E. are actually the descendants of a supposedly failed human mission sent to colonize Mars, left for dead by the Earth Federation, who formed their own nation on the red planet called Veigan.