With ten volumes of light novels to its name so far, Studio Trigger handled the anime production for the series.
Sentai Filmworks has a bilingual release of Inou-Battle, aka When Supernatural Battles Became Commonplace, coming out on August 30th, 2016 with separate DVD and Blu-ray releases.
Created by Nozomi Kota with artwork by 029 back in 2012, the series has been pretty popular.
When Supernatural Battles Became Commonplace - English Dub Cast Reveal