Ryu-ou Heika no Gekirin-sama: Hon suki Nezumi Himedesuga, Naze ka Ryu-ou no Saiai ni Narimashita

Princess Ruiying of the Rat Clan, the weakest of the thirteen animal clans, was summoned to the palace of the Dragon Clan, as the Dragon King sought a bride. But instead of competing with the other princesses, her goal was to check out the library of the dragon palace, the largest in the world. Seven days after arriving, Ruying was reading alone in the library when she was caught by a handsome man from the Dragon Clan. He suddenly kissed her and said, "I've finally found you," as Ruiying's life was about to change forever.

(Source: Seven Seas Entertainment)