Эдем, ледяное зеркало: Райская иллюзия

There is a small island in the sky called Orba Cler, a land where people can survive and avoid falling to the scorched earth below, thanks to the prayers of a Priestess. Yumi is the Priestess who waits for her childhood friend, who made a promise to her before being exiled from the mainland. This is an adaptation of the light novel Hyouketsu Kyoukai no Eden by Sazane Kei.