婚約破棄をした令嬢は我慢を止めました

The Crown Prince, who became her fiancé, loved her fairy-like, lovely, and adorable younger sister. ——Even though she thought she was supposed to be dead, Faustina woke up on the day she got engaged to the Crown Prince for some reason. Having regained the memories of "last time," she decided to stop enduring things so as not to repeat the same mistakes "this time." She would give up on the Crown Prince, hand him over to her sister, and live her life doing what she loves! However, all her actions intended to break off the engagement ended up backfiring...!?