Hikaru Shidou, Umi Ryuuzaki, and Fuu Hououji aren't from Cephiro. During a school trip to Tokyo Tower, the three girls are far removed from their imaginary worlds, filled with magic and wonder. At least, not until Princess Emerald, a pillar of Cephiro, begs the Magic Knights to save her world... and lo and behold, the three of them happen to be there!