Buddy Complex (tv-series, 2013)

When a giant robot suddenly attacks the city, a high-school student named Aoba is saved by a classmate who's piloting her own mecha. After accepting an offer to join the alliance she's is a part of, Aoba is thrust into the middle of high-flying robot warfare in this new series from the studio that brought you Cowboy Bebop, Outlaw Star, and Escaflowne!