Not to be too harsh, but ...
... this sounds awfully like something I've seen before. In fact, like an awful lot of stuff I've seen before. Most of it awful.

Pretty sure the immortal ninja kills the werewolf in the end ...
Constructive criticism (from one who has been there, done that! )
You're looking for 10k for ... well, nothing at the moment. At the very least, you should have a completed script or a rough storyboard for the whole movie. Without one or the other, you can't even begin to work out what budget you'll need. And then, even with a good outline of what human and physical resources you're going to need, you need a pitch that makes it sound like you're doing something different. Also, don't tell your audience they've never seen anything like this before: you don't know what they've seen.
Also
"We dont want to give too much away ..." doesn't work in this context: your sponsors have nothing to go on, so it just makes you part of the background noise. You don't have to reveal the whole plot, but at least set things up so that there's more than
"bloody, action packed scenes and an immortal ninja". Your scenario places two character types together when they should not be in the same world [a ninja spy belongs in mediaeval Japan; a werewolf belongs in mediaeval Europe] so what'll be most interesting is
why they've ended up
wherever they are now,
when is "now", and how does living outside their comfort zones of time and place affect each of them. That's what people will want to know - and pay for!