The Vatican is the Catholic Church's Holy Land. In the center of the country, there is an institution that performs thorough investigations into "miracle claims" from all over the world in order to determine their veracity. The group is known as "Seito no Za" (Assembly of Saints), and the priests who are members are known as miracle investigators. Hiraga Josef Kou, a brilliant scientist, is coupled with Robert Nicholas, an old archive and cryptanalysis specialist. The clever team works together to research the "miracles" and unearth the occurrences and schemes that lie underneath them.