Dewa Sanzan is Hagurosan, Gassan, a generic name of the Yudonosan
It was a mountain of the mountaineering asceticism to enshrine honorific title of a Japanese god of the mixture of Buddhism and Shintoism until the Meiji era.
Become Kamiyama after the Meiji era, the Hagurosan an Inakura spirit life, the Gassan god of night,
The Yudonosan worships major mountain god life, major king life, Mikami of shohikomeimei,
Since a founding, the Haguro group old mountaineering asceticism is succeeded to,
The faith to approach to Dewa Sanzan does not still change.