Shakugan no Shana volume 9

So, I have watched the anime towards around the end of season 1, but instead of finishing season 1 continued off with 2 of the only TLed volumes, volume 7 and 8.

Volume 8 ends at a sort of cliffhanger, and it seems while the anime changed many events around and skipped most of volume 8, there are some core ideas that are kept, like Wilhelmina coming (but the context in which she comes is very different).

With that being said, does anyone know what happens in volume 9 and how different it is from the anime?