This was originaly a bonus chapter from Butsu Zone manga by Hiroyuki Takei.
This chapters tell us a little about anna's shamanic powers and give us an early story of her origin; of course this story was some kind of "elseworld" in the shaman king universe.
Anyway, here's the link for those that doesn't have it yet :D
>>>>>>http://www.megaupload.com/?d=M565CBQD
Enjoy it! :D