In this shojo/josei fantasy manga, an unlikely romance blooms between the princess of a realm's lowest-ranking clan and the powerful Dragon King!

Thirteen clans rule the land, and the Rat Clan is the weakest. Ruiying, the princess of the Rat Clan, is summoned to the land of the dominating Dragon Clan along with princesses from the other clans. The Dragon King seeks a bride, and they are all candidates! Yet instead of vying for the Dragon King’s favor, Ruiying takes refuge in the palace’s enormous library—a place she can read to her heart’s content. It’s there that the Dragon King discovers her by chance, sparking an immediate connection that will change Ruiying’s life forever!

THE RAT PRINCESS DIARIES Ruiying, princess of the rat clan, has begun her formal training to become a worthy bride for dragon king Yawen. Much to her excitement, this comes with unconditional access to a treasure trove of knowledge! However, her teacher, Meiyu, informs her that being a “fated mate” holds special meaning in the dragon clan. Can the weak but clever rat princess handle the dragon king's unabashed love for her?