The links to nemoria.net above aren't working for me (the purchase here and website here links).
They (or their ISP) seem to be blocking certain IP numbers or ranges. The only way I can get their website to load is by using TOR browser, which blocks websites from detecting your IP number so they can't block you from accessing their website.
You can download TOR browser from https://www.torproject.org
You can use TOR browser to look at the nemoria.net/oknytt website, but it will probably be slower than your regular connection. Videos may be too slow to watch using TOR. Also I wouldn't use a TOR connection to purchase the game -- just to look. You can read about what TOR is herehttp://en.wikipedia.org/wiki/The_Onion_Router
A few weeks ago I was able to access their website without a problem. But not recently.