A young boy and a girl with a magic crystal must race against pirates and foreign agents in a search for a legendary floating castle.
Mayuka is a girl who appears one day and claims to be Tenchi's daughter. As the initial shock wears off, everyone in the Masaki household gets used to Mayuka's presence. However, things only become more interesting as Washu tries to discover Mayuka's background. What Washu found involves demon, the Prince of Jurai, and unrequited emotions.
Mikage and Tomomi Matsunaga are Miracle Girls: they have a telepathic link with each other and can teleport when they link their little fingers. Tomomi is a sports star and has a boyfriend called Noda. Mikage is the smartest student in the school and is in love with her sempai. He moved to London to study but they still kept in touch, that is until a selfish princess called Marie decides that he should come with her back to Diammas. Back in Japan the twins are having various problems of their own. But they soon realise that there is a link between Marie, an ancient legend, and a girl they know called Emma.
