She always thinks that she don't need others, so she led a solitary life, and she is happy with it. And that is why she decided to learn the Chanting Skills (Meieishiki), the skills on how to materializes his/her own "heart" and summons it. She believes if she learn the skill, she would become closer with him..., and to tell him something she wanted to say for long. Keinez (red) - Ruguz (blue) - Surisuz (yellow) - Beorc (green) - Arzus (white) as the basic colours, and through a catalyst on same colour with the one she wan't to summon, she have to glorify and then sings its name; are the Chanting Skills' basic way to summon own "heart". At a vocational school where these things are being teached Kluele studies them, and a tranfer student Neight, whose specialty is an unorthodox Night Colour chanting skills, attracts her interest. Although Xins, a well known Rainbow User, is also searching a Night Colour user...

Three quarters of the world, is the world of the dead. The world has been invaded by phantoms. One day, a boy named Nagi finds in the mountains of scrap wood a mechanical teenage maid girl. He immediately takes her home to repair her. The first things that Elise, this mysterious mechanical maid, says is, "Good morning, Nagi." Who is this mysterious silver haired girl? The fate of the world rests in their hands.