The Mysterious Disciple Miaka Yûki is an ordinary junior high school student who is suddenly transported into the world of a book, The Universe of the Four Gods. Surrounded by enemies with mystic power, she can only rely on her Celestial Warriors and a mysterious monk, a disciple of the oracle, to help her fulfill her quest! Miaka's best friend, Yui, also enters the book, but suffers a fate much crueler than Miaka's.