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!

When Yuchun and Ruiying are kidnapped by the bird clan, they assume that Yuchan is the dragon king's chosen bride-to-be and that Ruiying is worthless as a hostage. Meanwhile, Yawen is incensed that his beloved soulmate has been kidnapped. When he transforms into a dragon and loses control, will Ruiying be able to pull him back from the brink?! The fantasy romance between a weak but clever rat princess and the almighty dragon king reaches its climax in this final volume!

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?

In this shojo/josei fantasy tale, an unlikely romance blooms between the princess of a realm's lowest-ranking clan and the powerful Dragon King! In a fantasy world inspired by ancient China, thirteen clans rule the land, and the Rat Clan is the weakest. Rueiin, the princess of the Rat Clan, is summoned to the land of the dominating Dragon Clan along with the princesses of the other tribes. The Dragon King seeks a bride, and they are all candidates! Instead of vying for the Dragon King's favor, though, Rueiin takes the chance to lose herself in the palace's enormous library--a place she can read to her heart's content, since she's driven by an insatiable curiosity. It's there that she's "found" by the Dragon King himself, who immediately kisses her and claims she's the one for him?! A fantastical love story begins!