Makoto Sakura, sixteen years old, finds himself without a place after dropping out of high school. Suddenly, an otherworldly relic appears before him. On that day, dungeons began to appear all over the world. Humans acquired a level system that completely overturned their previous values. Amidst this revolution, Makoto finds his place inside the dungeons.

Acquiring cheat skills like "Experience Points x1000" and "Level Free," he becomes a level 10,000 powerhouse. As the strongest "Player," he embarks on dungeon exploration!