Gundam Reconguista in G

In the year 1014 of the Golden Age (after the Universal Age), a young member of the capital guard named Bellri Zeman is tasked with guarding a space elevator. While protecting it from pirates, he helps capture a powerful controllable combat robot (also called a "mobile armor") and its pilot named Aida Surugan. Bellri is one of the few who can operate the armor.