The Great Hole of Babel is a mysterious modern dungeon filled with monsters beyond human understanding, making it the ultimate destination for explorers seeking treasure and glory. Among these adventurers is Tadahito Miyama, an ordinary-seeming man who possesses a unique advantage: an ability that generates key hints and strategies for conquering any beast he encounters. Despite this power, Miyama has lived his entire life with people looking down on him, which has left him with little ambition and no drive to pursue greatness. He continues his dungeon explorations without any real motivation to rise above mediocrity.

The central conflict of the story revolves around whether Miyama will ever recognize the true potential of his own abilities. His power proves capable of surpassing even the strongest and most celebrated heroes, yet he remains indifferent to the possibilities before him. The narrative explores whether external circumstances or internal realizations might finally push him to abandon his unambitious lifestyle and embrace the extraordinary capabilities he has been granted. As he navigates the dangerous floors of the Babel dungeon alongside other explorers who underestimate him, Miyama faces a choice between continuing as an overlooked nobody or stepping into a role that could change everything.