Onyx Magical Academy (GXG)

In this story, Mia from the modern world is reborn as Flynn Astley, a duke's illegitimate child whose very existence endangers the duke's rightful children. To remove her from the political picture, she is transferred to a prominent magical institution that trains warriors to confront the demons invading the land. Mia reborn as Flynn must traverse a world teeming with rivalries and hidden intentions while discovering her own magical skills. As she faces both external and internal threats, she also battles with her identity and the possibility of love in the midst of chaos, all while showing herself to be a worthy fighter against the dark forces attacking her new home.