About three years ago, mysterious gates known as Dungeon Gates suddenly appeared all over the world. Those who entered the dungeons were endowed with special abilities called “Gifts” and gained the power to battle the monsters roaming within. Furthermore, it was discovered that magic stones obtained from dungeon monsters could serve as a clean energy source. In response, countries worldwide enthusiastically began dungeon exploration. Items other than magic stones, such as potions, held the potential to bring about significant societal changes. The fever for dungeon exploration around the world only intensified day by day. In a corner of the indisputable tourist city, Kyoto, lives a 34-year-old former corporate worker named Takayoshi Onda. He became unemployed simultaneously with the collapse of his company. Lost and seeking employment, Onda found a poster at the “Hello Work” office recruiting explorers. “Why not give it a try, becoming an explorer.” With that thought, Onda quickly obtained an explorer’s license and headed to the Kameoka Dungeon. Eventually, Onda’s name would become renowned as a front-line explorer in dungeon exploration, wielding the Gift of the “Qualification Master.”