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Approximately three years ago, mysterious gates—Dungeon Gates—suddenly appeared across the globe. Everyone who entered a dungeon was granted a special ability called a "Gift," gaining the power to fight the monsters that roamed freely within them.

Furthermore, once it was discovered that magic stones acquired from dungeon monsters could serve as a clean energy source, nations worldwide enthusiastically advanced dungeon exploration. And other items discovered within—like potions—possessed powers capable of transforming social structures... the global fervor for dungeon exploration only intensified with each passing day.

In a quiet corner of Kyoto, a bustling tourist metropolis, lived Takayoshi Onda, a 34-year-old middle-aged "corporate slave," who found himself jobless when his company went bankrupt. Perplexed, Onda headed to Hello Work (public employment service) in search of employment, but there he discovered a poster recruiting explorers.

"Becoming an explorer... that doesn't sound too bad."

With that thought, Onda promptly acquired his Explorer's License and set off for the Kameoka Dungeon.

Before long, Onda would come to make a name for himself as a leading frontline explorer. Wielding the Gift of [Qualification Master]...