Many aspects of its origin are unknown and there is a theory that says it was a tradition that the people of eastern Japan, the Emishi (Ebisu, Ezo), who were considered 'Matsurowanu tami' (people who do not obey) preserved while they were being driven into the Tohoku region by the Yamato government/Imperial Court.
その起源は不明な点が多く、「まつろわぬ民」であった日本東部の民・蝦夷（えみし、えびす、えぞ）がヤマト王権・朝廷により東北地方へと追いやられながらも守り続けた伝承とする説が唱えられている。