Buchigire Reijou Wa Houfuku Wo Chikaimashita.

Lady Elizabeth has her engagement annulled at a party by the crown prince, whose heart has moved on to another young noblewoman. She is then imprisoned in the dungeon over unjust accusations, and learns she has been betrayed by the country to which she has devoted everything…At the peak of her frustration, Elizabeth finally decides to defect, with a grimoire holding hidden and formidable powers in hand!! She begins her new life and trade with the help of Viscount Lucas from the neighbouring country. With a fierce desire for revenge against her home country in her heart.