Search - Magic Knight: Rayearth I, Book 1

Three girls from different schools are transported to a magical world. There, they discover that they are legendary knights who must save the world. I have to say, I expected a little more from CLAMP. It's not terrible, but the story suffered from an abundance of inane dialog and waaaaay too much chibi artwork. I got the impression that they were trying to be humorous like .hack or Dragon Knights. They failed miserably.

Kids in their early teens will probably enjoy it. Which makes sense, since that it the target demographic (as opposed to 30-somethings...).

Volume 1 of a 3-volume manga.

Clamp's fantasy adventure about three Tokyo schoolgirls summoned to save the land of Cephiro. At first, it reads like the plot for a video game (something the characters themselves joke about). But by the second volume, it deepens, and it concludes with a surprising, poignant ending.