After All, This is Isekai. Volume 1

In the heavenly office, an error occurred, and after death, an ordinary girl is reborn in the world of her favorite book—a captivating fantasy novel. Now she is a beautiful aristocrat, Lady Litter Merto. She faces a struggle for the throne, court intrigues, a jealous husband and… another death?! No way, in her third life, she will definitely find happiness! For this, Litter is ready to do anything—even marry the gloomy and unsociable duke of the northern lands…