Sixteen-year-old Makoto Sakura is homeless after dropping out of high school. Suddenly, a strange device appears before him. On that day, dungeons began to appear all over the planet. Humans created a level system that fundamentally went against what they had previously believed. During this rebellion, Makoto takes up his post in the dungeons. As soon as he hits level 10,000, he obtains cheats like “Experience Points x1000” and “Level Free,” at which point he becomes a formidable opponent. He enters the dungeon as the strongest “Player” and begins exploring!