Why are we doing this...? Haruhiro came to his senses and found himself in darkness. He had no idea where he was or where this place was. He was surrounded by a group of men and women who had lost their memories like him and only remembered their own names. After leaving the underground, a world "like a game" was waiting for them. In order to survive, Haruhiro formed a team with his partners in the same situation, learned skills, and entered this world as a volunteer trainee - "Grimgar". No one knows what will happen in the future... All of this is an adventure story born from the ashes.