My name is Yuji. I am a Japanese with Native Japanese skills and a damn good web-marketer. I believe I would be perfect for this project however I think the pricing might not appropriate. It should be fixed how much you will spend per month because the workload will change depends on the budget.
As for Google AdWords, I have an experience that I had more than 1,000 accounts when I was in Google. As for Yahoo, I managed an account for the startup I used to be in.