Mobile Suit Gundam Wing: Endless Waltz

It is the year After Colony 195, and war between the Space Colonies and Earth has begun. To give the colonies an edge, they send 5 young soldiers, trained to perfection, to earth in the most powerful of Mobile Suits-Gundams. With their arrival, the tide of the war changes as they battle against the Earth forces and the Colonies of their origin.
(Source: Anime News Network)

The year is After Colony 195, and the Gundam boys have taken a stand for eternal peace by deciding to destroy their robotic weapons, Gundams. The peace is broken, however, when Mariemaia Khushrenada, who claims to be the daughter of the late Oz leader Treize, kidnaps Relena and declares a war of independence against the United Earth Sphere Nation. Perhaps it’s time to pull those Gundam units out of retirement.

Centuries in the future, in the year After Colony 195, Earth is surrounded by orbiting space colonies. The colonists are cruelly oppressed by the Earth Alliance, which uses huge humanoid fighting machines called "mobile suits" to control the populace. Behind this tyranny is the secret society called "Oz," which has infiltrated the Alliance military and steered it towards its repressive course.
Now, the space colonies are ready to strike back. Five young pilots, equipped with advanced mobile suits called "Gundams," are sent to Earth to wage guerilla war against Oz and its Alliance puppets. 
The war to decide humanity's destiny begins.