Kidou Senshi Gundam: Tekketsu no Orphans S01

300 years after a long war between Earth and Mars known as the "Calamity War", a woman named Cordelia travels to Earth to gain independence for one of Mars' cities. She is supported in her journey by the members of a private security unit called CGS, including Mikazuki Augus and Orga Itsuka. However, when a group called Gjallarhorn attacks CGS, Orga and Cordelia see this as a golden opportunity to rebel against CGS and stage a coup. Now, Mikazuki and Orga are embroiled in a new war, and Mikazuki pilots an old mobile suit from the Calamity War era. The weapon, powered by a nuclear reactor, is called the Gundam Barbatos.