Nao, an 8th grader, is one of the only two members of a Digital Camera Club, where she also serves as the manager. It's a mystery that she shoots nothing else but the skies and clouds. One day, she finds a cat on a rooftop where she usually shoots her camera. It's a cat that knows how to manipulate the flow of a wind. Shocked to find a strange animal, Nao loses her footing and falls off from the rooftop! Miki is the other member of the club, and also Nao's best friend. Mr. Taiki is the teacher who's taught the cat how to manipulate the flow of a wind. Ryoko is a girl who has a huge crush on Mr. Taiki. And there's Jun, who helps Nao and Miki look for a cat that can fly. Then, there's Yukio, who is the widow of Mr. Taiki's deceased brother. On the outskirts of this big city, a town off the Wind Handlers, has been formed—and a mysterious Wind Festival is about to begin... (Source: Production I.G)

In the Victorian era, the British Empire is bustling with the energy of the steam-powered industrial revolution. Following in the footsteps of his famous family of inventors, James Ray Steam enjoys his youth in Manchester helping at local factories and stealing components for his own creations. One day, he receives a package containing a strange ball with an attached valve from his grandfather, who has been working in the United States alongside Ray's father. However, it is not long before people from the O'Hara Foundation storm into his house demanding he hand it over. Confused and afraid, Ray attempts to flee to the home of his grandfather's colleague, Robert Stephenson, with pursuers hot on his trail. While Ray seeks to piece together the secret of the ball and discover the power it contains, it seems practically everyone in the British Empire is ready to seize it from him.