Suddenly, light and seven colors of the world were taken away by Satan of darkness, Black Raven. Then all human turned into a stone, on the contrary, animals were turned into human form. Ai, the only girl who did not become stone, sets out on a journey to defeat the Black Raven along with fellow animals that became human. In order to regain the peace, the order, colors of the world and her younger brother, her challenge has begun!!