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I remember hearing once about how, during times of depression, entertainment actually tends to become even more upbeat and happy as a way of taking people's minds off of the depression around them. So if were true that more entertainment is restrained and introspective (which, granted, is far from established), does that suggest that it's actually because people are feeling more comfortable to contemplate such things?
That being said, as others have suggested, this reeks very much of selection bias. There are a lot of happy, uplifting, fanciful Japanese manga, novels, games, and anime even today. Perhaps try the Suggestions forum for some recommendations.
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