A.D. 20XX.

50 years have passed since the appearance of what are called "Dungeons" all over the world, plunging humanity—which believed all difficulties could be solved by science—into a crucible of chaos.

At the time, the world was plunged into great disorder, and various disturbances, large and small, broke out across the globe. But those commotions are now a thing of the past.

Currently, the dangerous creatures known as monsters inhabiting Dungeons, along with concepts bestowed only upon those chosen by the Dungeons—specifically, special phenomena like levels, jobs, skills, and magic—are recognized as common knowledge.

Amidst this, there were individuals chosen by the Dungeons who delved into them, fought the monsters infesting them, and brought back resources obtainable only from within.

Against these bizarre entities that science was powerless to overcome, these individuals used special powers to confront them, contributing to the advancement of humanity. People called them "Explorers," with a mix of praise and awe.

April. An extraordinary anomaly occurs in the body of a seemingly ordinary boy, who is about to make his debut as an Explorer.

Will the anomaly that struck the boy bring about change or stagnation?

50 years since the Dungeons emerged. The world is on the cusp of a time of transformation... perhaps.

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