Sora Amami was the weakest adventurer, known as a bottom-tier F-rank. One day, after being assaulted and robbed by an E-rank adventurer, Sora picks up a black orb in a dungeon. When the orb's power is unleashed, a status board appears before Sora. Breaking the limits of rank, distributing stats through level ups, customizing abilities, and creating unique builds, Sora acquires ultra-rare items with guaranteed full drops. Refining dungeon equipment one after another, Sora grows stronger. This is the story of the weakest adventurer who becomes the strongest.