Vampires don't have souls though. This might sound like I am reaching in the case of Shinobu, but oddities get their powers from believes. Shinobu can't see herself in the mirror and the reasons vampires can't see themselves is because they presumably lack a soul... What do you think?
The English release groups 3 novels into one. So you can buy the first 2/6 novels from Vertical Inc. they've got storefronts on Amazon, and have their books in many bookstores iirc. Translations for the next 1/3 novels are being released at the end of November.
I don't know where to read them for free, but I could dig into that.