I'm not entirely sure as there could be many different themes in a Kocho Visual Novel. It might be about the adventures of a character named Kocho, or it could revolve around a fictional world with its own set of rules and stories.
Perhaps it has unique art styles. Visual novels often have distinct visuals, so Kocho Visual Novel might stand out with its own kind of character designs or background scenery.
Well, without having read the 'kanae no hoshi light novel', it's hard to say precisely. However, in general, light novels often feature young protagonists. So perhaps this one is about a young person named Kanae. It could be centered around their daily life, which might seem ordinary at first but then takes a turn into something extraordinary. It could include elements like school life, if it's a modern - setting story, or it could be a story about a Kanae who discovers a hidden power or a secret in a more fantastical world. There could be a host of supporting characters that help or hinder Kanae's progress, and various sub - plots that contribute to the overall story.
A common theme is the clash of different power systems. For example, when Shinobu crosses over into a world like 'Fullmetal Alchemist', her demon slaying powers contrast with the alchemy in that world.
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