The earliest known piece of writing on Ikaiguchi is found carved into stone, buried below the historical site known as Jiruishi. It tells of entities called the Norowareta, who rode great horses and attacked at night, bringing with them the dark things of the world.
The defenders of Jiruishi apparently rode out nightly to save the village, distracting the Norowareta, though each night one of them would be claimed by the entities. The plaque ends with the observation that with no defenders left to risk the journey, the town would surely be razed by the Norowareta. This stele, over four thousand years old, has contributed to the theory that one common foe challenged the humans of Ikaiguchi in prehistory, already popularized by the presence of similar figures on primitive graves. Proponents of this theory call the common foe Norowareta, drawing the name from this stele.