Hai to Gensō no Grimgar (light novel)

Grimgar of Fantasy and Ash (灰と幻想のグリムガル, Hai to Gensō no Grimgar) is a light novel series written by Jyumonji Ao with illustrations by Eiri Shirai. OVERLAP published the first novel on June 23, 2013 under their Overlap Bunko imprint, and seven volumes have been released as of December 25, 2015. A manga adaptation by Okuhashi Motsumi began serialization in Gangan Joker in April 22, 2015. An anime adaptation of the series was also announced and premiered on January 11, 2016.

Story Synopsis
Why are we here? Why are we doing this?

Before Haruhiro had realized what happened, he was surrounded by darkness. Why was he here? Where was here? Even now, he still didn't know. Those around him were the same as him, no one remembered anything other than their own names. And when they emerged from the darkness, the world that awaited them seemed like something out of a video game.

In order to survive, Haruhiro forms a party with the others, learns fighting skills, and as a soldier in the reserve force, takes his first steps into the world of Grimgar. What awaits him there, he doesn't know...

This the story of an adventure born from the ashes.