Manga by author Futami Sui

From MangaHelpers:300 years ago, the demon lord attempted to take over the world but was defeated by a hero. But now, the demon lord has been reincarnated in the form of a cute girl who doesn't have any memory of her past. She still retains the same deadly powers, but her only resource is the memory robot assistant. The reemergence of the demon lord also means that somewhere, a new hero has appeared. The demon lord creates a fairy named Mao to locate this new hero who is said to have the hero's mark on his neck. However, what Mao finds is Alsha, a weak and a little timid young boy. As the cute demon lord observes and guides Alsha through Mao, who she has a direct connection to, in his quest to become the strong hero, she finds that he really is a hopeless young kid. [vyc]

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 jobto learn the inner workings and behind-the-scenes secrets of the dungeon from the inside. [Seven Seas]Original Web Manga+

Summary:In order to find their teacher who had suddenly disappeared, Yotsuki and Kotowari went on a journey, visiting six of her friends as she instructed them to.Blessed with the gift of magic, with the search as their goal, the girls' incident-filled fantasy story begins.

Searching for her lost father in a fantasy dungeon, master thief Clay meets the dungeon's caretaker to learn its secrets in this intriguing new manga.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?