As the title said, I've searched for the OST on google and found it by this uploader, Belina. So credit goes to him/her:

community.livejournal.com/shounenonmyouji/55454.html

So does anyone think that they can translate it and re-upload the ost? I would greatly appreciate it, and so would all the other Shounen Onmyouji fans. Thanks in advance! <3