There are certain divisions of the population on Samaria. Angels were once human but were then genetically modified in Jehovah's labs. According to the holy book, the Librera, the angels were made by Jovah to oversee Samaria, and also to control the temperamental weather elements. Angels have beautiful voices in order to pray to Jovah. Angels have wings, are larger, more muscular, stronger, with enhanced metabolisms and respiratory systems. The Edori are the wandering humans. The Manadavvi are highly cultured and wealthy. They are an aesthetic people, obsessed with money and the wonders that it buys. The Jansai are calculating and greedy merchants, and are the primary motivators of the Edori slave trade in the novel.
The next archangel-to-be, Gabriel, is reluctant to marry. He is shocked to find that his bride Rachel, is an Edori slave. She has grown to hate the angels because of what they had done to her family when she was younger. Gabriel also has to deal with the corrupted soon-to-be-ex Archangel, Raphael. Raphael doesn't want to step down and doesn't believe that there is a Jovah. This is heresy and Gabriel must immediately take control over Samaria for the good of the people but his bride, Rachel, keeps making his life difficult. Even with all their troubles, Gabriel and Rachel finally realize that they love each other and Samaria is saved, for now.