Anata Tachi ni Suterareta Watashi Wa, Yoyaku Shiawase Ni Naresodesu

Arianne is a young girl who was born and raised under the strong protection of the spirits. She has been with Lionel, the son of a duke, since childhood, and they have pledged to marry each other, leading a peaceful and happy life together. But one day, her family, the count, forces her into an unwanted engagement with the second prince, and she is imprisoned in their mansion. Arianne continues to endure her loneliness, believing that she will be reunited with Lionel, but eventually she is deprived of the protection of the spirits and is treated coldly by her family, which pushes her to the brink both physically and mentally.