Hyouketsu Kyoukai no Eden

A world where humans are invaded by the existence called Yuugenshu. People were able to survive because of the floating continent, Obie Crea, protected by Priestesses’ prayers. Sheltis had once aimed to become a Sen'nenshi - a partner of Yumii, his childhood friend and also a Priestess. However, because he fell from the continent to the Eden , he harbored Mateki, what only Yuugenshu have, inside his body, and was exiled from Sophia where Yumii lives. Meanwhile, Yumii was hoping for Sheltis to become her Sen’nenshi, but because he fell to the Eden , her wish is still unfulfilled. A multi-layered world fantasy where their feelings intertwine!

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...