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?
Ryouta Arata is an otaku who's just lost his job. In order to avoid becoming a NEET, he joins a PMSC, but little does he know the life of a mercenary is more grueling than he could ever imagine.