Akuyaku Reijou Level 99: Watashi wa Ura Boss desu ga Maou de wa Arimasen

A college student is reborn as Eumiella, a noblewoman in an Otome RPG world. In the game, Eumiella is initially insignificant but later appears as a hidden boss with stats rivaling the heroes. Neglected by her parents at their estate, she begins to train extensively, reaching level 99 by the time she enters the Royal Academy. She had hoped for a quiet life, but the game's heroine and her romantic interests suspect she is the Demon Lord due to her overwhelming power. Her high level and abilities bring various challenges, marking the start of a fantasy story about a powerful, evil hidden boss who longs for peace.