She Professed Herself Pupil of the Wise Man: Mira to Sutekina Shōkan Seirei-tachi

She Professed Herself Pupil of the Wise Man: Mira to Sutekina Shōkan Seirei-tachi (賢者の弟子を名乗る賢者 〜ミラと素敵な召喚精霊たち〜, Kenja no Deshi o Nanoru Kenja: Mira to Sutekina Shōkan Seirei-tachi) is a Japanese manga series by Yu Uonuma based on the light novel of the same name by Hirotsugu Ryusen and Fuzichoco.

Plot
Sakimori Kagami has woken up in the world of Arch Earth Online, a VRMMORPG he's been playing intensely for a long time. The catch? He made some adjustments to his character when he last logged on, which he thought he hadn't saved. Instead of his normal avatar of an old, bearded sorcerer, he's in the body of a young woman! Now he must convince the people of this world that he–she–is a pupil of the wise man who vanished without a trace thirty years ago.