Tenseisha wa Cheat o Nozomanai

Mira peacefully resided in a magical world until a blow to the head caused her to partially remember her previous life in Japan. The protagonists in reincarnation stories always end up having to deal with trouble, which is the last thing she wants. Alas, what awaited her was the selection exam for a magic academy and naturally(?) her special cheat ability was discovered then. A fantastical tale of a reincarnated girl who doesn't want any cheats.