Isekai Kara Seijo ga Kuru You na no de, Jamamono wa Kieyou to Omoimasu

Synopsis:

Felicia suddenly regains memories of her past life, only to be sent off to a distant foreign country in marriage by her newly crowned older brother—essentially cast away as a nuisance. She soon realizes this world follows the setting of an otome game, where her fiancé, Crown Prince William, is destined to fall in love with a saintess summoned from another world. As the unwanted obstacle, Felicia is fated to be executed. To avoid this doom flag, she resolves to abandon noble life and live as a commoner, earning a living by making medicine. But then William leans close and murmurs irresistibly sweet words to her… What kind of trap is this supposed to be?!