A corporate slave of a black company challenges a dungeon for the first time… 500 times his annual income in one night?! He’s had nothing but bad luck thus far, but then his luck turned around, and with his newfound invincibility, he’s starting a carefree life of adventure! In present day Japan, countless dungeons appeared. Hekoobi Keita, a corporate slave exploited by a black company, goes into Shibuya’s dungeon with indifference. Thanks to a rare monster he coincidentally defeated, he obtained the cheat skill, Greed! As soon as she saw that ability, a super-rich high school girl named Okoshiyama Sudare offered him a 60 million yen contract to become her personal explorer…?! Everything’s on a whole other level as his life of overwhelming success begins!!!