Bonjin Tansakusha no Tanoshii Gendai Dungeon Life

Tadahito Ajiyama is an ordinary explorer in a world that features the dungeon known as “The Great Pit of Babel," where “monsters” beyond human comprehension dwell. After a certain incident, he gained the ability to hear "Strategic Hints” that helps him to overcome dungeon obstacles!? His partner is Aleta Ashfield, the strongest dungeon explorer in the world, so much so that Ajiyama is often called “Aleta's pawn." However, his new power is strong enough to defeat any hero and even possibly destroy the world someday! The story of an adventurer who is just an ordinary person, but will eventually become the absolute strongest, begins here!

(Source: Overlap, translated)