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 Ymy, 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 Ymy lives. Meanwhile, Ymy 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!

adapted from the light novel series of the same name