Thanks to my idiotic document naming methods, I accidentally deleted this chapter! :D
And the computer that had a copy of it no longer exists.
Until I re-write this chapter, please enjoy the short version of what happened here:
Natsuki was the daughter of the head priest, used for a ritual involving herself, Kaori, and Chiyo. Chiyo and Natsuki both died mysteriously.
After being defeated by Akemi, Natsuki dropped a key with a crane on it.