Eila to Totsu Kuni no Ou

After her father expected to stop the war with his neighbors and accepted the marriage application of the neighboring country, Princess Ella went to the neighboring country to become the wife of the first prince. However, there is a terrible rumor in neighboring countries. No one who has married into the royal family will come out again after entering the city. With uneasiness and curiosity about the first prince, Ella went to a neighboring country...