Hikaru Shidou, Umi Ryuuzaki, and Fuu Hououji are strangers brought together by fate during what appears to be a normal school trip to Tokyo Tower. Accompanied by a great flash of light, they hear the plea of a mysterious woman to save "Cephiro," and the middle school heroines are suddenly swept away by a giant flying fish. They then arrive in an unknown realm where they encounter a man named Master Mage Clef. Clef informs the girls that they have been summoned by Princess Emeraude to fulfill their destinies as Magical Knights and restore peace and balance in Cephiro. Once vibrant and peaceful lands have been thrown into chaos since the High Priest Zagato imprisoned the princess, the pillar of stability for Cephiro. The Magical Knights reluctantly accept Clef's words as truth and embark on a journey to rescue Cephiro from the clutches of evil.
