root-book

A man is summoned to a world to become a dungeon core. With no memories of his past life, the newly reborn dungeon core is confronted by man wanting to make him part of a system. However, the next thing he knows, he''''s whisked away again to another world, this one full of high-tech magical stuff. It turns out that the man he''''d encountered is apparently a tyrant bent on controlling several worlds and sends demons to bend those worlds to his will. After choosing the name Null for himself, he finds himself thrust into a world as a dungeon core without a clue of how to be a dungeon core. Fortunately for him, once he gets his feet on the ground, he''''s able to join the dungeon guild, A whacky collection of dungeons fulfilling tasks to make the world a better, less demon infested place.