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It has been three years since the first dungeon, a massive cave teeming with monsters, appeared. In a world where dungeon raiders are commonplace, Yoshimura, who has been living a mundane corporate life, surprisingly (and perhaps regrettably?) finds himself at the top of the global rankings! Desiring a more relaxed lifestyle, he decides to retire and venture into the dungeon. Armed with mysterious skills he's acquired, he joins the frontlines of the dungeon raiders. What lies ahead for his carefree life?