Grimgar of Fantasy and Ash Novel Volume 17 features story by Ao Jyumonji and art by Eiri Shirai.

With the Frontier Army newly independent and an alliance with the goblin king achieved, Haruhiro and his team are sent on a vital infiltration mission to disrupt the enemy from within and take Mount Grief. But despite working alongside members of Shinohara’s Orion, Team Renji, and the Tokkis, their goals prove to be further out of reach than they ever imagined. Forget the mission—can the team even survive?