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

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!