Due to the Great War, human being had to shift their living place to the underground towns they have created. However, the underground society is now about to self-destruct. The protagonist heads to the above-ground world, through the dungeon filled with monsters.

Due to the Great War, human being had to shift their living place to the underground towns they have created. However, the underground society is now about to self-destruct. The protagonist heads to the above-ground world, through the dungeon filled with monsters.