Erabarenakatta Oujo wa, Tegami wo Nokoshite Kieru Koto ni Shita.

Original Web Serialization
Original Web Novel

Nortima was working hard as the first princess of the Kingdom of Antoire, in order to become the next queen. One day, while sacrificing everything to receive her education as a crown princess, she saw her fiancé Vince and her sister embracing each other. Learning of the betrayal, she decided to leave a letter and leave the palace, but was cornered by pursuers and driven to a cliff... Nortima, who did not want to die, was approached by a man who offered her a helping hand...