In present-day Japan, countless dungeons appeared. Hekoobi Keita, a corporate slave exploited by a black company, goes into Shibuya's dungeon indifferently. but 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!!!