Ryuuou no Kagehime  

龍皇の影姫

Since the incident where my hometown was destroyed by the kingdom's guardian water dragon, my sole purpose has been to exact vengeance upon Prince Miaki, who was believed to be the sole individual capable of controlling the dragon. Upon entering the Imperial Palace under the pretense of a lady-in-waiting, my plan was to exact my revenge on him. However, upon being discovered, he proposed an unexpected alternative - that I pretend to be his consort instead. This leads us into a captivating contract marriage as we work together to unravel the mystery surrounding the succession to the throne.