Sieg, with his elite defensive power, is kicked out of his offense-oriented party, forcing him to take a job as a gatekeeper for one of the most dangerous cities in the world. Can he keep its citizens safe from the constant threats they face?

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?