When Haruhito awakens, he's in the dark. He doesn't know where he is, why he is here, and where he came from. Around him there are several men and women who have the same circumstances. Haruhito and his companions find themselves in a game-like world called Grimgar and must form a party, cooperate, and learn new skills to survive the harsh environment together.
from ANN
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Notes

Alternative Names: Grimgar of Fantasy and Ash
Author: JYUMONJI Ao
Artist: SHIRAI Eiri
Genre: Action, Adventure, Drama, Fantasy, Romance
Demographic: Shounen
Adapted into the anime, Hai to Gensou no Grimgar