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

Princess Ruiying belongs to the Rat Clan, considered the weakest among thirteen animal clans. She is brought to the Dragon Clan's palace, where the Dragon King is seeking a bride. Rather than participating in the competition with other princesses, Ruiying is primarily interested in the palace's vast library, believed to be the largest in existence. On the seventh day of her stay, she is found reading alone in the library by a man from the Dragon Clan. He kisses her unexpectedly and declares, "I've finally found you," marking the beginning of a significant shift in her life.