A story of a Prince from a high-tech country, Ulynia, and a Princess from an evergreen country, Eldela, when the princess' brother makes the engagement without telling her, she disguises herself as a maid in Ulynia's palace...where she meets the prince... (Source: Vampire Knights)

Shiranai Kuni no Monogatari was published in English as A Tale of an Unknown Country by CMX Manga from September 8, 2009 to June 29, 2010.