An Old Man Restaurant Owner Is Unparalleled by Relying on His Old Tricks. It Turns Out, He's the Legendary Dungeon Conqueror.MUKASHI TOTTA KINEDUKA DE... TO IINAGARA MUSOU SURU TEISHOKUYA NO OSSAN, JITSU WA DENSETSU NO DUNGEON KOURYOKU SHA; 昔取ったきねづかで…と言いながら無双する定食屋のおっさん、実は伝説のダンジョン攻略者

A world where Dungeons have appeared on Earth. Kenichi Nishida, a 40-year-old man, quit his salaryman job to open a diner, but it was a total failure. After much agonizing, what he came up with was Menu development using Dungeon-sourced ingredients & Livestreaming his ingredient procurement! He breeze through conquests that would normally be life-threatening—just who is this old man!? Viewers, Idols, and even S-Rank Adventurers are obsessed with Nishida's overwhelming strength and mysterious charm!