What happens next? Update! :)

Proper punctuation is your friend - it wants to be in the story. Proper grammar is feelin' a bit lonely, too. The story is moving too fast, so it becomes like a list of events. For example:

"A day later at the knd tree house in sector V

'Bradly bradly BRADLY GET UP' 3 tears started flowing down her face(Had to open the position of numbuh 6 sorry to you bradly lovers out there)"

Bam. Not only did that pop up disgustingly quickly, but the entire situation feels rigged (never type why you killed someone off).

Take some time and show some character development. For example... Shadow. I know, I know... ninja assassin guys are supposed to be cool. And don't get me wrong, they are cool, but he feels like a plot device. Try giving him some flaws and weaknesses. More personality would help as well. It'll reduce from his "T3H C00LN3SS" factor, but it will make him MUCH more interesting. Your chapters are too short. You could easily fit in more words per chapter. Also, read your story over again. Doesn't it seem a bit... difficult to read? The problem here is that you discarded all but the most basic forms of detail, so it feels like a script. Spice up the detail.

Since no story is without its good points, I will say that the concept is okay. A bit simple, maybe, but not terrible.

Anyway, fix it up. Put some time and effort into your story. You'll be surprised at how much better it comes out once you do.