Rakuin no Monshou Tasogare no Hoshi ni Ryu wa Hoeru

is the first volume of the Rakuin no Monshou light novel series, written by Tomonori Sugihara and Illustrated by 3. It was released under the Dengeki Bunko Imprint in May 2008.

Synopsis
A world once dominated by highly intelligent dragons and supported by a civilization that uses demons. Mephius and Gerbera, who had fought a war for ten years, were about to put an end to the long battle by a political marriage between the royal family. Orba, who became a gladiator after being displaced from her hometown by the war when she was young, will be replaced by the rumored prince of Mephius, who is rumored to be sick, because she looks like a melon. Meanwhile, her courageous Gerbera princess, Virina, secretly decides to entice her prince for the benefit of her country. In the middle of their wedding, there was an attack by someone !? What are their thoughts and whereabouts of peace ──?

(source: Bookwalker JP - Translated)