Rin Fujiki is a Japanese author and original creator, primarily known for writing the light novel series Vatican Miracle Examiner. Born on May 22, 1961, in Osaka Prefecture, Fujiki is a female writer who initially gained attention for her non-fiction works focusing on history and shamanism. She made her debut as a novelist in 1998 with the book Dakini no Oriru Ito.

Fujiki is most recognized as the creator of the Vatican Miracle Examiner franchise. The story follows two priests, Hiraga Josef Kō and Roberto Nicholas, who work for a special Vatican institution known as the Seat of the Saints, which is tasked with investigating the authenticity of reported miracles around the world. The series blends mystery, religious themes, and scientific inquiry as the protagonists use both theological knowledge and rational methods to solve cases that often involve murder and conspiracies.

The original light novel series began publication on December 10, 2007, with illustrations by THORES Shibamoto. It was initially published by Kadokawa Shoten before being transferred to the publisher's Horror Bunko imprint in 2010. The series has remained active for many years, with over twenty-five volumes released to date.

The success of the light novels led to multiple media adaptations. The first manga adaptation, illustrated by Eiji Kaneda, was serialized in Kadokawa Shoten's Comic Kai magazine from January 2012 to January 2013 and was compiled into two volumes. A second manga adaptation, illustrated by Anjue Hino, ran in Media Factory's Monthly Comic Gene magazine for a shōjo demographic from August 2016 to December 2018 and was collected into five volumes.

An anime television series adaptation produced by the studio J.C.Staff aired from July 7 to September 22, 2017, consisting of twelve episodes. The anime was directed by Yoshitomo Yonetani, with Seishi Minakami handling series composition. An original video animation episode was released on April 11, 2018. Fujiki is credited as the original creator for the anime adaptation.

Fujiki's work on Vatican Miracle Examiner is characterized by the integration of historical and religious elements with mystery and horror. The series is noted for its detailed exploration of Catholic traditions and procedures regarding miracle verification, combined with fictional elements of secret societies and alchemical experiments. The narrative approach, featuring a duo of investigators who use complementary scientific and theological expertise, has drawn comparisons to works such as The Da Vinci Code and The X-Files. The long-running nature of the light novel series and its expansion into manga and anime demonstrate Fujiki's significance as a creator of successful transmedia mystery fiction in the Japanese publishing industry.