You can't NOT get through that part. That's the scene at the love hotel, right? Well, you only have three options, by three options, by three options. So at the worst, if you're working completely blind, you still have a 1/27 chance of getting the right answer. And the game will keep starting it over if you do.
But basically, choose the path of self-denial and it'll be no problem.
Unless you mean how do you know how to find the Shadow, in which case, Fuuka will tell you eventually.
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