I was reincarnated as a villainess, but I became obsessed with magic and ended up being doted on by a prince.

https://www.cmoa.jp/title/262003/ Lillian, a former office worker, suddenly finds herself reborn as a seven-year-old girl. Realizing she's been reincarnated in another world, she decides to try out the magic she's always dreamed of. Flying through the sky, defeating monsters—Lillian is thrilled by this world where magic is at her disposal! But after meeting her fiancé, Rex, she realizes she's actually the villainess from an otome game! If things continue like this, she'll be condemned and her engagement broken off!? To protect her magical life and live in peace, Lillian decides to aim for a peaceful annulment of her engagement—?