Kurogane no Mahou Tsukai
黒鉄の魔法使い
Over ten years ago, the main character was sent to a different world and developed into a magician under unusual conditions. He has been living comfortably there until a girl approaches him, requesting to become his student. She appears to have also been transported to this world. The narrative follows his role as her mentor, guiding her as she seeks to carry out her vengeance.