This is the third volume of manga author Aki Shimizu's adaptation of Natsuhiko Kyogoku’s “Hyakki Yakou” series with the second novel, “Mouryou no Hako” or “Box of Spirits”. It continues to build on the themes from “Ubume no Natsu”, like crime, suspense, body horror, psychological trauma, and esoteric Shinto rituals, while adding some mad science to the mix.
The story has expanded, because there was more than one investigation this Scooby gang was getting entangled in and the revelations could be more than they bargained for, if not, beyond the pale of human morality.