What made you pick writing a story focusing on the kami? What made the kami stick out apart from the other Japanese myths?
When I was little I had a book of myths, and one of the stories was about Amaterasu and the cave. From that moment I was fascinated by the kami and the myths surrounding them.
I also learned that kanji were originally developed to communicate with the spirit world, and so I liked the connection between writing with ink and the power of the kami. The imperial family of Japan has always traditionally been descended from Amaterasu, so this was history-turned-myth that I could use in my books. :)