Akuyaku Reijou Level 99: Watashi wa UraBoss desu ga Maou de wa arimasen

A college student awakens to find herself reborn as Eumiella, the nefarious daughter of a noble family in the world of an Otome RPG she once played. Initially, Eumiella isn't much of a concern in the game, but by the endgame, she reappears as a hidden boss with stats so formidable that she rivals even the heroes. After being left alone at her family's domain by her parents, Eumiella's passion for gaming reignites. She dedicates herself to leveling up relentlessly. By the time she enrolls in the Royal Academy, she has reached level 99. Originally intending to live quietly and out of the spotlight, Eumiella soon finds herself under suspicion from the game's heroine and her love interests, who believe she might be the notorious Demon Lord. Her extraordinary powers attract numerous challenges and misadventures. Thus begins the fantastical tale of an immensely powerful, evil hidden boss who yearns for a peaceful life.