From the Sneaker Bunko, the first volume is now available. The second volume is scheduled to be released on August 1st. A manga adaptation is currently serialized in Monthly Shonen Ace (the manga adaptation follows the book version, not the web version). Approximately 20 years have passed since dungeons suddenly appeared all over the world. Humanity has acquired levels, stats, and supernatural powers known as skills. Among the adventurers who challenge the dungeons in hopes of striking it rich is Amane Rin. He possesses a unique skill called [Dungeon Inner Transfer], which is considered useless due to its poor usability. However, a turning point comes for him. Exactly one year after starting his dungeon exploration, his [Dungeon Inner Transfer] skill evolves during a level-up. As a result, Rin becomes an entity not bound by the dungeon's rules. As the only special existence in the world, Rin continues to level up at an overwhelming speed and quickly ascends to the position of the world's strongest. This is the story of a boy who was once considered useless and becomes the world's strongest. ★ Daily Overall Ranking 1st ★ Weekly Overall Ranking 1st ★ Monthly Overall Ranking 1st ★ Quarterly Overall Ranking 1st ★ Annual Overall Ranking 1st ★ Cumulative Ranking 20th It is also posted on Kakuyomu.