Nijhazer kindly warned us on our forum that Gamespot.com's new Oni review contains far more information about Oni's story (as well as a lot about its gameplay) than many fans will wish to know before playing the game. So I'm not actually going to post a link to it. If you want to see it, visit the site, go to the article, and don't say you weren't warned. :-)
(Feel free to discuss the matter on our forum, though. Just make sure to put SPOILERS in the subject line.)