[1] The Schistostega luminous moss growing at the site was also designated as a Natural Monument of Japan on November 30, 1928.

The graves extend in several rows running west to east along the face of the hill, with the entrances varying slightly in size due to the topography.

[3] The Yoshimi Hundred Caves were first excavated in 1887 by Tsuboi Shōgorō, a professor at Tokyo Imperial University and one of the pioneers of Japanese archaeology and anthropology.

However, his theory was challenged after further research in the 1920s, notably by Mitsutarō Shirai and other archaeologists, who argued that the structure of the caves and artifacts recovered were consistent with other late Kofun period tombs of the 7th century AD, and that there was no material evidence to indicate that the Koro-pok-guru were anything more than a folktale.

In addition, similar artifacts have been found at the nearby Kaziwazaki Plateau, which contains a number of 5th to 7th century kofun burial mounds and the ruins of contemporary settlements.