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!
The world suddenly finds itself faced with 666 dungeons and 10 years to clear them all...or face total annihilation. How will each country react? What can Ezoe Kazuhiko and his newfound companions do in the face of overwhelming despair?