I don't know of any
holy books sacred to Shinto. However, here's a place where you can start:
REVERED TEXTS IN SHINTO:
(Containing ancient histories, laws, traditions, mythology and ceremonies and prayers. These are not “holy” texts!)
The Kojiki “Record of Ancient Matters” *
http://www.comparative-religion.com/shinto/kojiki/
The Nihon-Shoki “Chronicles of Japan” *
http://www.comparative-religion.com/shinto/nihongi/
The Kujiki “Chronicle of Ancient Events”
The Kogoshui “Gleanings from Ancient Stories”
The Engi Shiki “Detailed Laws of the Engi Period”
http://www.comparative-religion.com/shinto/yengishiki/
Here is a cool Shinto website, that tells of some of the legends associated with the Shinto festivals:
http://www.thelema.net/hml/00Shinto/ShintoINDEX.html