Middle school student Miaka Yuki and Yui Hongo are both preparing for the exams for Jonan Academy, a highly competitive high school. Miaka is an average student, but is applying to please her mother, while the brilliant Yui is applying so she and Miaka can go to the same high school. While at the National Library, Miaka follows a vision of a phoenix to a special collections room where she finds a book called the Universe of the Four Gods. When the two girls start reading it, they are pulled into the book and taken to a world similar to ancient China.
