Naruki Komada was born into a family of exorcists, but had zero power of breaking demons. For this reason, he lives his life as a writer. One day, while on a research trip to Kyoto, he learns that a series of missing persons cases that have been making the rounds involve non-humans. He sets out to solve the case with Naruki's only messenger, Ice Demon, and a local detective and elite exorcist, Kamo Reiji, whom he met by chance.