The Sky Maiden and the Prince of Light (Formerly: I Seem to Be the Villainous Lady)

Previously a Japanese citizen in her past life, Mina discovers upon entering magic academy that this is the world of a popular otome game spin-off novel. Five years after the game's ending, the world is overrun with monsters, and the heroine and hero fight for their country. Mina realizes she is the engaged woman of the second prince (the hero), destined to drive a wedge between the hero and heroine, ultimately falling from grace to become a commoner. However, due to certain circumstances, Mina had already become a commoner eight years prior. Unrelated to the novel's plot, she diligently studies to become a magician.