I swear I only took Necromancer for the buffs, I'm not evil

A gamer is reincarnated into the body of a 'Main Villainess' of the earlier portion for an Otome game she played in her first life. The problem is that she played the game for its massive open-world section and only vaguely remembers the 'Royal Academy Years'. What actually happened to this particular villainess? Execution? Banishment? Nunnery? She was certain those things had happened to different villainesses throughout the early game. Still, as long as she focused all her efforts... towards... Wait... Magic... is... real? OF COURSE IT'S REAL! This is a real version of the game world! Which means... THE CLASS SYSTEM IS REAL! And if the class system is real... Oh... Oh yes... She smirked, "I can work with this." Then paused and tilted her head thoughtfully, "Hold on, what was I thinking about a few seconds ago? It seemed pretty important." After a few moments, she shrugged. Honestly, with magic at her fingertips, she could hardly see a single problem with this world! What better thing could she have than unlimited access to real magic? Isekai, Reincarnated into a Villainess Body, Magic, not-otome-game-but-in-an-Otome-game universe, Rated Primarily for Violence.