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During the second playthrough, if you favor Yuri over Natsuki all three days, then Monika will simply say "I tried to warn you" or something to that effect, in lieu of her third "poem." However she can still make reference to her "poem" later on in the game. This, naturally, threw me for a loop before I replayed and made different choices.

I actually thought this was intentional, and I certainly don't think I would have thought to close the game otherwise. Funny what this game does to your thinking, I guess.