Japanese anime feature based on the four-part original net animation. Patema (voice of Fujii Yukiyo) is the princess of an underground village comprised of tunnels. She is curious about the world outside and often explores her surroundings. When Patema enters a forbidden area known as the 'danger zone', she finds herself above the ground and turned upside down. There she meets a young boy, Eiji (Nobuhiko Okamoto), and together they embark on an adventure.