A young stallion lost his family from the Changeling in Canterlot and become a orphan until the Princess of the Moon adopt him. While trying to search of what his parent left, he stumble upon a device that's beyond what Equestria ever seen - The AGE Device. With that, he learns of a family from another world and the war they endure with the help of three legendary ancient 'messiah' called Gundam.

Vowing to become a savior like them, Cosmo Bringer, now attend Celestia's School for Gifted Unicorns in order to study the advanced technology in secret from everypony and design his own Gundam, the Age 4. However, when the Changeling broke free from their prison, he now gear up and fight with it along with teaming up with Twilight and her friends as he struggle to open his heart to friendship while at the same time to keep the oath he sworn to fulfill his parent's wishes.

The road of friendship, the road of vengeance, and the road of savior............... the three roads begin to collide...................... the legacy of a war begin to materialized into Equestria..........

The coming of a new chapter of AGE has begun.

So this is a sequel to Gundam Age series and set on MLP Season 5. Unlike all of the Gundam series, the Mobile Suit will be as technological armors similar concepts of Spartans from the Halo series and from Iron Man.