(from ebookjapan):

Tameko Ishigami, who works for a travel agency, goes on an unusual occult tour of Tohoku and encounters a variety of spirits.

She had bizarre spiritual experiences at Lake Jusanko in Tsugaru, and at Mount Osorezan in Shimokita, also haunting the accompanying psychic researcher, Makisusuke, and psychic, Reiko Maya.

And what was the true nature of the spirit that possessed Tameko? It is a message from the spirit world that exists in everyone!