The Secrets of Adept Frey, or The Isekai Girl Strikes Back

To die in my own world and end up in the body of a young third-year initiate at a magical academy is unexpected and strange—but that’s only half the trouble. The main thing now is to survive and not fall into the hands of the agents of the Secret Office and the banned Order of Magicians.
But help arrives completely unexpectedly, from a dark presence beside which a light flares in my soul, my heart beats faster, and suddenly it isn’t scary anymore…