The Greatest Mercenary’s Dungeon Tactics

Ryuji Hasumi, a soldier deployed overseas, finds himself transported to a world of dungeons, monsters, and magic. Unfamiliar with these tropes, Ryuji nevertheless helps a group of adventurers, using items to summon any weapon he's used before. Faria Mirabel, an adventurer he saved, takes him to the dungeon city Rhedom to help him fulfill the goal given to him: clear the 10 mythical-rank dungeons to return home. Faria accompanies him into a legendary-rank dungeon to find a key he needs, where they find a mysterious squad of unauthorized adventurers hired by the king. Will Ryuji make it back home?

(Source: WEBTOON)