Kidou Senshi Gundam: Tekketsu no Orphans

More than three centuries after the Calamity War, Mars remains economically dependent on Earth while the military organization Gjallarhorn enforces the existing order. Kudelia Aina Bernstein, a young noblewoman supporting greater independence for Mars, hires Chryse Guard Security to escort her to Earth for political negotiations.

The job falls largely on CGS's expendable child soldiers, including Mikazuki Augus and Orga Itsuka. When Gjallarhorn attacks to eliminate Kudelia, the adults abandon the children to die. Orga refuses to accept that fate. With Mikazuki taking control of the ancient Gundam Barbatos, the boys seize CGS for themselves and form Tekkadan, beginning a dangerous journey in which survival, dignity, and the future of Mars become inseparable.