Kaifukushoku no Akuyaku Reijou

In the world of "Reas Love," a spinoff otome game, the villainess Charlotte Cocoriara's engagement to the prince of Farblume Kingdom is suddenly broken off. The reason? The Prince finds her job as Dark Mage ill-suited for his future queen. He'd rather be with a Healer, and there is no such thing as a job change. But Charlotte has a secret...memories of her past life playing "Reas Life Online," the original MMORPG! Armed with her cheat knowledge, Charlotte immediately takes off to the Sacred Land of Erenzi where she uses information no one else in "Reas Love" knows to change her job—to a Healer! Except she has no intention of going back to the Prince. What she really wants is to see the world and live a life full of adventure!

(Source: J-Novel Club)