Hikaru Shidou, Umi Ryuuzaki and Fuu Hououji suddenly find themselves transported to Cefiro, an arcane world in another universe. Summoned by the Guardian Emeraude, the three gorgeous women must save the fragile universe of Cefiro. By using both magic and technomagical abilities and artifacts the Magic Knights, by virtue of being outsiders to the Cefiro realm, may yet be it's salvation.