Moto Tensei Reijou to Suuki na Jinsei wo

Karen, a woman who has been reborn and faced numerous hardships, finds herself in an unfamiliar setting the day before her marriage to Emperor Reinard. A mysterious girl leads her to an alternate reality where she was never reincarnated. This world is different from the one she knows, presenting a new set of circumstances. Determined to return to her original world and reunite with those she cares about, Karen embarks on a new journey.