From the last boss:
"Ok, the only news here is that the official Heavenly Sword site is now open, and can be accessed here. So I eagerly checked out the U.S. page searching for new pictures, and was foiled to find only a boring blank screen. Remembering that the developers were somewhere over in Europe, I checked out the French page and successfully found more details and images. Here's the translated official story details:
Heavenly Sword is a history of revenge, courage and discovered self. The members of the clan tell that also far they remember, prophecies always spoke about a son, descendant of their chief, which will have to lead them to their place, to the paradise. But when the chief of the clan becomes the father of a small girl, prophecy never seems to have to be carried out… It is in any case what everyone thought… After the assassination of his/her father by a assoiffé rival of blood, Nariko is likely nothing any more but one last to be able to modify its destiny and to avenge death for his/her father..."