Second-hand markets, specialized import stores, and online auction sites often carry original physical copies of these releases for collectors.
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Unlike mainstream titles, doujin games rarely appear on Steam or Nintendo eShop. Instead, try these Japanese indie storefronts:
Here are some top sites for downloading Kyoudai ni Okeru Seikoushou no Kiroku extra quality:
Added scenes, extra CGs, or additional dialogue paths that were not present in the original, compressed release.