Decades ago, Dungeons appeared across the world, and people awakened to mysterious powers known as Skills. Those who possessed them became Explorers, risking their lives to conquer dungeons, defeat monsters, and gain wealth and fame. This is the story of a boy who aims to reach the very top of that world. Noboru Takegami is a young man who dreams of becoming an Explorer. However, the Unique Skill he awakens—〈Skill Collection〉—is considered utterly useless. Any skill he acquires functions at only one-tenth of its original power. Because of this, Noboru is mocked as having “the weakest Unique Skill in human history.” One day, while exploring a dungeon, Noboru falls into a sudden trap and is forced into a desperate battle against monsters. In the midst of this life-or-death struggle, the total number of skills he has acquired reaches 10,000, unlocking a Super-Class Skill — 〈Peerless and Unmatched〉. This extraordinary skill dramatically enhances his physical abilities in proportion to the number of skills consumed. Thanks to Noboru’s Unique Skill, which allows him to acquire an unlimited number of skills, the compatibility between the two is absolute. Armed with the strongest power known as a Super-Class Skill, can Noboru rise from ridicule and become the Hero he has always admired—!?