I just uploaded an app on google play at US. I have friends in Japan says that he downloaded my app and leave some comments. But I can't see that in my Developer Controller. Still 0 downloads, no comments on my google play page is US. Is there a way to see the google play in other country, and get the number of downloads in other country? Thanks.
The statistics are updated on a daily basis. (Please see this question) You should be able to see the download count within 24 hours of publishing the app. The Android Developer Console statistics page will show all the details about the application including the country-wise download count.