Mushoku no Kaibutsu Player

Ten years ago, the real world and the dungeons of MMORPG games suddenly merged, and "Paradise Heaven" was born here. Dungeons and monsters appeared in various places, and survivors began to be called "players"... Among them, Leo Ameike was taken as a guide to the dangerous special dungeon "Anekmene (Forbidden Zone of Life)". Ameike, an unemployed player, sees an opportunity and tries to escape, but there the party is annihilated by a boss monster of unknown race, ability, and level! A desperate pinch...! However, his fate begins to change greatly when he encounters the monster...!? (Source: Piccoma, translated)