Mirai is a 13-year-old girl who lives in the human word. One day she witnesses a mysterious object fall from the sky into the park. Excitedly, she brings her stuffed bear Mofurun with her to see what it was. When she gets there she sees a girl named Riko flying on a broom. Riko is of the same age and from the magical world. Mirai has a lot of questions, and Riko explains that she's searching for a jewel with strong powers called "Link Stone Emerald."