"The Twelve Kingdoms" is an anime series based on the novels by Fuyumi Ono. It follows the story of Yoko Nakajima, a high school girl who is transported to a fantastical world divided into twelve kingdoms. Each kingdom has its own unique culture, politics, and creatures, and Yoko must navigate this unfamiliar land while discovering her true identity and purpose. Throughout her journey, Yoko encounters various characters, including Keiki, a powerful creature who becomes her guide. The series explores themes of self-discovery, leadership, and the complexities of governance, as Yoko learns to confront challenges and make difficult decisions in her quest to return home.