The guide you linked to shows all three routes and all five endings. And considering that it doesn't contain any spoilers, I think that makes it one of the better walkthroughs out there.
Don't be disappointed that there are only three routes. If I remember correctly, I spent ~10 hours on each of them, and it was time well spent.
You don't really need a guide though. You can only enter the second path after finishing the first (and the 2nd before the 3rd). When you finish one path, it usually hints where to find the next. And when the days change, it shows which path (if any) you are on. Save often in case you die, and don't worry too much because the game lets you skips scenes you have seen before.
