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Do you know any web page or market study that shows the sales statistics of the visual novels? I think it could interesting.
Not to my knowledge, no. At least not in the English market. You used to be able to use SteamSpy to get a general idea of how Steam VN sales are, but they changed the system so you need special access right to see it (in other words, pay to see it), or else they'll give you too wide of an estimate.
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