On the world that consists of a single giant continent called Dokkanon, most people have some kind of special ability. Those who have a high-ranking ability, such as the ability to control water, are respected...

Masuda Keima, a lazy high-school boy who prefers to laze around and avoid working, gets summoned as a dungeon monster by a girl avatar named "Dungeon Core No. 695" who is the dungeon core of the mighty one-room...