MangaGamer will release free uncensor patches for future Steam releases of eroge, following the lead of MiKandi JP and English indie developers.

MangaGamer commits to free uncensor patches for Steam releases

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From MangaGamer's official blog:

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[...] we managed to reach an understanding with Valve regarding patches.

Going forward it will be our general policy to provide free content patches for all Steam releases whenever possible where there are content differences between versions. Technical issues or contractual obligations with specific developers may make patching not possible for specific titles, but we will do our utmost to ensure that doesn’t happen. Should patching not be an option for a relevant title, we will inform you before it goes on sale.

We will be working to update some of our existing Steam titles with content patches in the future; however, as our previous Steam releases were designed as separate versions, it may not be immediately possible for some older releases. [...]