The Ainu are Japans' largest ethnic minority. They are known for Shamanistic beliefs and practises which are considered part of the Siberian tradition. Shamanism is probably one of the sources of Shinto, the indigenous religion of the ethnic Japanese.

Aino Folk-Tales
by Basil Hall Chamberlain [1888]
This is a collection of Ainu folktales, by the translator of the Kojiki.

Yukara, epos of the Ainus
by Kiyoko Miura.

Kutune Shirka, The Ainu Epic
tr. by Arthur Waley [1953]

NOTE: The preceeding two texts have unknown copyright status.