"An Immortal's Reverie" is a captivating novel that takes place in a world where ordinary people go about their daily lives, completely unaware of the existence of superhuman beings who tirelessly defend their world from various disasters such as world destruction and invasion from other planes. The story revolves around a group of Superhumans who have been tasked with protecting humanity from these threats and the challenges they face in fulfilling their duties while keeping their true identities hidden from the public eye.