[Machine Translation] A woman working at a teahouse was murdered. In her hand was a piece of fossil, a strange stone. The "fossil hunter," whose wife was kidnapped, receives a threatening letter from a mysterious gang, asking him to "find the strange stone of the bird of immortality. Shingo Kondo, the first assistant magistrate of the Minamimachi Magistrate's Office, is determined to solve the case, but... This is the seventh installment in the popular series about the exploits of a sympathetic Doushin who says that the bigger the hoax, the better.