The World’s Fastest Level up!

It’s been 20 years since dungeons suddenly appeared in the world. Humanity got supernatural powers like Level, Status, and Skill.
Dreaming of becoming rich quickly, Amane Rin, an adventurer challenged to capture dungeons.
Even though he possessed a skill unique to even adventurers [Transfer within dungeon], he was deemed as incompetent because of the poor usability of the skill. However, the turning point for him came. After a year since he started capturing dungeons, [Transfer within Dungeon] evolved with a level up. As a result, Rin became an existence unrestricted by the rules of the dungeon.
Rin, who became the only singularity, continued to level up with overwhelming speed and climbed to the strongest position in the world in the blink of an eye.
This is the story of a boy who was looked down upon because of his incompetence, but eventually became the strongest in the world.