The official site for Hai to Gensou no Grimgar
has announced some of the lead cast members, as well as character designs, for the upcoming anime adaptation by A-1 Pictures. The series is slated to premiere in Winter 2016.
The original light novel, written by Ao Jyumonji
and illustrated by Eiri Shirai
, was announced to receive an anime adaptation in October. The series began publishing in June 2013 and is currently ongoing with five volumes in print.
Source: Official site