Chapter 12 sets the stage for a story. Who is this story about, and what is its stated purpose?

The latter part of Chapter 12 introduces an upcoming narrative that it calls a "very delightful story." The purpose of this story, as the chapter explains, is to illustrate the greatness of the Guru and to indicate the nature of love for the Guru's devotees. The central figure is a ritualistic, orthodox Agnihotri (keeper of the sacred fire) from Nashik with the surname 'Mule'. His arrival in Shirdi is described as a fortunate coincidence that happened due to the strength of his past merits, highlighting the belief that one cannot even stay in Shirdi for a moment without such merit.