Don't worry too much, what you have right now is simply the prologue of the game. There is a plot, it's all been written out and planned years ago now and it's going to happen.
Also, I think you're being a bit unfair regarding all you can do in the game, since even in a single playthrough, as long as you don't speed read it, you can literally have hours of fun. The game has been designed so that you cannot do everything in one go, sure, but there's still quite enough to enjoy.
Let's look at what one can do during one single playthrough:
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