This game is indeed great, do not be mislead by the silly looking RPG-style engine. The different endings alone are much better than most commercial games out there. Some fetishes displayed are not really a turn-on for my taste, but hey, at least no futanari to endure here ;-) One downside is that it is very easy to miss something, and you possibly only find out in the end.
While you can use the Walkthrough to get everything right, backtracking really is annyoing. So here is a save game that should get you all the endings EXCEPT the flleeing alone and fleeing with others endings. It starts you right at the B2 part so you need to complete everything here according to the guide:
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It should work if you open the game, save a game as a placeholder, close the game, go to the subfolder ...\www\save and replace the created save with the downloaded one there.