In a world where adventurers—human warriors possessing supernatural abilities—must fight deadly monsters to protect humanity from certain destruction, a mere level 1 adventurer finds himself in a seemingly endless struggle for survival. One day, he was thrown by his party into the core of the dungeon and suddenly a mysterious program called the System selected him as a player, giving him a unique ability to increase his strength. This was something that other adventurers couldn't do, because adventurers' abilities were fixed after they awakened. He then embarks on a journey as he fights against all kinds of enemies, both humans and monsters, to discover the secret of the dungeon and the true source of his power.
