In a world where the Seventy-Seven Dungeon, a mysterious ruin, exists.

It is said that a treasure beyond human comprehension is bestowed upon those who reach the dungeon's deepest chambers, leading both national and private adventurers to eagerly take on the challenge.

Amidst this fervent activity, Raid, a humble farmer who is neither an adventurer nor a national soldier, one day stumbles upon an astounding secret of the dungeon.

From that day forward, an unprecedented dungeon conquest begins, utilizing an ultimate glitch (exploit).