After death, before reincarnation, the souls of the deceased transit through a fantastical realm known as, . Gudo is a spirit that helps to guide these transient souls to their reincarnation. While guiding a young girl named Yuri, he learns that humans have emotions that he does not understand. Tasked by Goddess Mira to help Yuri control her rage and prevent her transformation into a monster, Gudo embarks on a perilous mission.