Umi, Hikaru, and Fuu are three schoolgirls out on a field trip to Tokyo Tower, whisked suddenly away by a strange voice and light to Cephiro, a world full of spirits and sorcery. They were summoned here through the last remaining strength of the Princess Emeraude, who hopes that they are the trio destined to become the magic knights legend says can save her realm! But how are a bunch of junior-high-school kids supposed to defeat the dark might of the sinister Lord Zagato... with only an exceedingly strange bunny creature named Mokona as their guide?