When I woke up, all I found was a room I didn't know, a crystal, and "me" with no memories. Awakened as a dungeon master, Dan summons ant monsters with a few points to expand the dungeon. Together with the ants that are growing inexhaustibly and evolving, get rid of the enemies who got lost, sometimes bring in friends, create an impregnable large labyrinth, and get a new happiness and daily life in the dungeon!