"The Twelve Kingdoms" is a fantasy novel series written by Fuyumi Ono. It is set in a fictional world divided into twelve kingdoms, each with its own unique culture, politics, and magical elements. The story follows various characters, primarily Yoko Nakajima, a high school student who is transported to this world, where she must navigate challenges and discover her true identity. The series explores themes of self-discovery, leadership, and the complexities of power. Each kingdom has its own rulers and mythical creatures, contributing to a rich tapestry of storytelling. The novels have been adapted into an anime series, further expanding their popularity and reach.