Ashes to Another World Salvation

Coming to a different world and becoming a student at the Magic Academy, Fat Man asked why the theory of magic seems more complicated than high math. Is there an old man in the ring who can save me... It is impossible to learn, and it is impossible to learn in this life. The magical girl who lives in the body knows everything, and her voice is beautiful. I really like being possessed by her (/≧▽≦)/~┴┴