The link to Typemoon's F/SN site is here
However, unless you can read/speak Japanese and buy the game, there is no way you'll be able to play it. As a TypeMoon game, just like Tsukihime there is over 60+ hours of text to read. People have tried to make translational patches, but its just so much that they've been working for years on the two games with no real progress. (I believe the Tsukihime work began first, and almost a year later they are 6% done.) If someone professionally was translating it, it might not take as long, but...the market for these games isn't THAT viable, so they don't really put too much effort into licensing and translating these games. Pity.