Tendaiji Temple at Mt. Hachiyosan is home to ten bugaku performing dance masks from the Kamakura to the Muromachi period (designated as tangible cultural properties by Iwate Prefecture) while the dance itself was, unfortunately, lost.
Later, a string of surveys conducted for the preservation of Hachiyosan Tendaiji performing arts started in 1994 proved the dance is actually the one of the Imperial Household Agency (designated as national important intangible cultural property). Participating members of the studies then joined with the Hachibasan Tendaiji Preservation Committee to form the new Tendaiji Bugaku Preservation Committee in 2020.