Kousotsu, Mushoku, Bocchi no Ore ga, Gendai Dungeon de Oku wo Kasegeta Wake: Kaisha ga Tousanshite Mushoku ni Natta node, Kyou kara Himitsu no Dungeon ni Mogutte Kaseideikou to Omoimasu

Saguru Oana is a passive guy with no money, no job, and no girlfriend. Desperate for cash, he downloads a shady-looking app called Dungeon Go! Only to find himself pulled into a dangerous game of real dungeon exploration. But for some reason… he suddenly gains a cheat ability right from the start?! After rescuing a girl named Kyoko from a monster and teaming up with her, their skills turn out to be an insanely good match. Together, the two of them start raking in huge amounts of money with ease!!
Source: MU