Dungeon ni Tojikomerarete 25-nen. Kyuushutsu sareta Toki ni wa Rippa na Fushinsha ni Natteita

"This dubious individual is on the verge of becoming a legend." A young man named Nagano disappeared after confronting a dungeon that suddenly emerged in contemporary times. He endured for 25 years in its unexplored depths, consuming fierce monsters and developing an extraordinarily powerful physique. Upon his eventual return to the surface, he discovers a future Japan where dungeon streaming has become compulsory. His wild rampage, which exceeds even that of disaster-class monsters, is instantly streamed, and he swiftly ascends to the level of premier explorers. With 25 years of expertise under his belt, Nagano rises to be a legend of this new age.