Witch Libor

One of the Three Great Wizards who created the Great Barrier that transported their home country to a different dimension to avoid persecution. Later on, she gave up on being a witch, and fled into the human world in order to live a normal life, leaving the responsibility of keeping the Great Barrier to the royal family and the Alkanet family. She had then sealed her magic, but somehow, her descendants can still remember the spell for the Great Barrier. It is revealed in the final chapters of the manga that she is an ancestor of Noriko and her mother, and both of them are theoretically able to perform the Great Barrier.