Heavy Object

is a Japanese light novel series written by Kazuma Kamachi and illustrated by Ryō Nagi. ASCII Media Works have published twenty volumes from 2009 to 2021 under their Dengeki Bunko label. It has received three manga adaptations. A 24-episode anime television series adaptation by J.C.Staff aired from October 2, 2015 to March 25, 2016.

Plot
In the world of Heavy Object, the United Nations has collapsed, leaving the world divided between four powers - the Legitimacy Kingdom, the Information Alliance, the Capitalist Corporations and the Faith Organization. Following the development of Objects, armored fighting machines possessing vastly superior capabilities to conventional units and weapons, war has developed into a bloodless game determined by battles between Objects.

In a military base located on the frigid regions of Alaska, a mechanic-in-training named Quenser learns the ropes of becoming an expert in the field of Objects, and meets one of its elite pilots named Milinda. As their friendship develops, Quenser discovers that the real face of war is merely hiding behind the mask of bloodless defeat and victory...

Official

 * Anime Series Official Site (Japanese)

Other Sources

 * Wikipedia Article on Heavy Object