Have failed to confirm if the Kurougatake listed in Kuuga episode 1 exists or not (though given the top listings are all Kuuga sites, I'm inclined to say not -- though accept that I may be wrong, since obscure places in Nagano are likely to be very obscure indeed.) But I did find this link, which looks nifty: Dictionary of terms in Kuuga (Japanese).
Found where the main Nagano Police station is. Turns out we drove by it while the cabbie was lost trying to take us to our hotel. Oh well.
*watches Godai chow down on curry* Rats. Now I want katsu curry. Hoshi~~~~