Konyakusha wo Sutetara, Tanoshii Mahou Gakkou no Seikatsu ga Matteimashita

Misha, the daughter of a viscount, regains memories of her past life after being betrayed by her fiancé, Rudolf. In her previous life as a Japanese woman, she had also been betrayed by her fiancé and died tragically. Furious, Misha punches Rudolf and breaks off their engagement for good. Determined to move on, she decides to pursue her long-held dream of enrolling in a magic academy. However, after rescuing a mysterious handsome young man who collapsed on the day of the entrance exam, her life begins to take an unexpected and dramatic turn…?!

https://www.ganganonline.com/title/2574