Clay was trained by her father to be an expert member of the thieves' guild. Since her father disappeared three years ago, she's been using her skills to search for him in a dungeon filled with goblins, a Minotaur, and all manner of other dangerous creatures. When Clay reaches deeper than anyone ever has before, she meets the caretaker of the dungeon. To her surprise, Clay is invited to join the staff! And thus begins Clay's new job-to learn the inner workings and behind-the-scenes secrets of the dungeon from the inside.

An unexplored dungeon, filled with monsters and traps. An expert thief, searching for her lost father. When Clay delves into the dungeon deeper than any adventurer has ever gone, she is offered a job by the dungeon's caretaker! Now, instead of exploring, Clay must learn how to interview new monsters, set traps and position slimes around the dungeon. Will this new career path bring her any closer to finding her father?

Clay's gotten used to her life working in the dungeon, placing slimes and bats, manufacturing skeletons and zombies, and even learning a bit about the darker secrets surrounding its management. Now that she feels like she understands how to use her magic power properly, she decides to try to make it all the way down to level nine. What will she find?