Three years have passed since dungeons appeared on Earth. After accidentally gaining a skill that turns dungeon diving into an RPG, office worker Keigo becomes the world’s top explorer. Can he turn status screens into piles of cash and quit his job?

When office slave Tadashi Tanaka dies of cancer, he finds himself reincarnated in a violent world resembling medieval Europe. Now living as Varian de Lioncourt, he must begin his life anew!