My Fate Changed While I Was Napping

/ Utata Nekashiteiru Ma Ni Ummei Ga Kawarimashita Leafa, a marquis's daughter, has long suffered being ignored by her fianc, the third prince Freddy, treated as nonexistent by her father, and bullied by her stepsister. The only comfort in her life is helping out the male teacher, Lars, at the academy and spending peaceful moments by his side. One day, Leafa receives a notice from her father: her engagement is to be broken because her stepsister is carrying Freddy's child, and she is to enter a convent after graduation. When she tells Lars about this, his behavior suddenly changes! While dozing off in the academy cafeteria, she is unexpectedly kissed and told, "Become mine." And to her shock, Lars's true identity is a royal prince!?