A yamabushi (Shugendō mountain ascetic), who has devoted himself to austere spiritual training at Mount Haguro in Dewa Province, is traveling to the mountains of Ōmine and Kazuraki. On the way there, he arrives at the village of Kasuga in Yamato Province. While he is waiting for a passer-by to ask about local sightseeing spots, he is approached by an old man who guards the fields in Kasuga. When the mountain ascetic asks the old man about a pond, he is told that it is called the Field Guard’s Mirror. The old field guard explains that the Field Guard’s Mirror reflects the image of a field guard but at the same time, there was once such a mirror in the possession of a spirit demon who resided in this field. The spirit demon transformed himself into a human being who guarded this field during the daytime and rested inside a mound in the field at night. Furthermore, the mountain ascetic asks if this pond is the same as the pond described in the poem about the mirror of the field guard who found the hawk. The old field guard provides an explanation about that as well. The mountain ascetic asks the field guard to show him the mirror, but the guard refuses his request, saying that the field guard’s mirror is a terrifying object, formerly in the possession of a spirit demon. Instead, he offers to show him this mirror-like body of water and vanishes into a mound.

After listening to the villager tell the story of the Field Guard’s Mirror, the mountain ascetic offers prayers before the mound into which the old man disappeared. Then, the spirit demon appears, holding the mirror in his hand. The spirit demon uses the mirror to show the mountain ascetic all four quarters of every region from the heavens above to the hells below. Finally, the spirit demon stomps his feet down on the ground, rending a gash in the surface of the earth through which he returns to the abyss.