Sora Tensui was once known as the weakest adventurer, part of the 'Bottom F-Rank'. After being assaulted by E-Rank adventurers and having his equipment stolen, Sora found a black orb in a dungeon. When the power of the orb was unleashed, a status board appeared before his eyes. Sora could now break the rank limits, allocate stats through level-ups, customize abilities, and perform builds that other adventurers couldn't. He could also obtain ultra-rare items with guaranteed drops. By refining dungeon weapons one after another, Sora grew stronger. This is the story of the weakest adventurer becoming the strongest.