She Professed Herself Pupil of the Wise Man (Manga) Vol. 11

FATHOMLESS FORTRESS Mira teams up with powerful members of the Isuzu Alliance to apprehend Chimera Clausen’s leader, which means heading into a hundred-level dungeon. There, Mira and her companions encounter a mysterious individual battling the Chimera on his own. Is he an enemy, an ally, or something else? Whatever he is, he may have important information to impart to Mira!
Series Overview: Sakamori Kagami has awakened in the world of Ark Earth Online , a game he plays religiously. The catch? Instead of his normal avatar–an old, bearded sorcerer–he finds himself in the body of a girl! Now he must convince the people of this world that he–she–is a pupil of the legendary wise man who vanished without a trace thirty years ago.