HEAVY OBJECT S

In the near future, super-sized weapons called "Objects" roam the battlefield. Fighter planes and tanks have become obsolete, as the difference in performance of the Objects directly determines the winner of war. In this world, a story of a reckless and epic battles unfold between a girl who pilots an Object and two juvenile delinquents! (Source: Kadokawa, translated) — Description from AniList community (anilist.co).