In an enchanting bookstore within a mystical realm, Kaori and her adoptive father cater to the peculiar beings of the spirit world by offering them books. However, Kaori's tranquil existence is disrupted when she saves a wounded human boy named Suimei, an exorcist by trade and a traditional foe of spirits. As they navigate this clash of worlds, Kaori endeavors to show Suimei that the boundaries between humans and spirits are more intricate than he perceives. This heartfelt narrative weaves together themes of humanity and Japanese folklore in a captivating supernatural journey.