Aru Hi, Burikko Akuyaku Reijou ni Narimashite.  

One Day, I Turned into a Villainess Noble Girl, An Otome Game's Burikko Villainess Turned into a Magic Otaku, One Day, I became a Two-Faced Noble Villainess, The Two-Faced Noble Villainess has become a Magic Otaku

In the world of an otome game, a young woman named Manami found herself transformed into a five-year-old child after falling down the emergency stairs at school. As it turned out, this little girl was one of the rival characters in the game; the flirtatious and attention-seeking type known as "burikko." Despite her initial apprehension, Manami decided not to let it bother her since it was all just a dream. For now, she was determined to learn magic in the game!