@GiennaDragon
Thank you for the praise :D
Actually, I was planning to add a side story after finishing the Xing Kingdom arc. It will be mostly about Rei and her past, but the rest is a secret ;)
As for the two oc's, I tend to put more than one oc in a story. I have another Fanfic where I do that and the one I'm currently writing is like that too. Although, I have to admit that adding more than one oc is a bit difficult :P