That's so sad that he didn't even get a route, I really love that tiger so much and somehow finding him in this game with a good story makes me even more empty.
I know this isn;t very helpful, but if you're looking for an English version, it will be EXTREMELY difficult since the game was originally in Japanese with no proper in-game translation. You'd need to download a lot of stuff to get it to 1) download, 2) translate it, and 3) get it to work in the first place. I tried following an updated tutorial and my computer crashed via Blue Screen of Death. But if you can manage to get it to work, then I highly recommend playing it...I've never played it and I cried to a slideshow with music :)