It has been about 30 years since dungeons suddenly appeared in the modern world, and Seekers, people who are adapted to dungeons, began to appear among the population.

One morning, Musou Daichi, a high school graduate and freelance worker, realizes that he has become a Seeker. Seekers are people with unique abilities such as level, status, and skills.

Daichi bikes to a nearby dungeon and explores his first dungeon through trial and error. This is the story of a young man who gradually gains power while raising his level, acquiring skills, and cashing in the magical stones obtained by defeating monsters.