Isekai de Migawarihime Ninari Haou ni Ubawaremashita

One day, Serina, an ordinary woman, is suddenly transmigrated into the presence of Ceres Diana, the infamous princess of the Kingdom of Sipitria, notorious as a cruel and scheming vixen, with a face that looks just like Serina. Her kingdom is being attacked by the neighboring Heilbronn Empire. Serina is still confused by the situation when she is...