No, it's for the game itself. I don't think the DLC has nsfw scenes.
Watergami
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A member registered Mar 19, 2021
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Nekojishi Expansion Pack: A Sunny Day comments · Replied to antxstu in Nekojishi Expansion Pack: A Sunny Day comments
I found it on Reddit: https://www.reddit.com/r/nekojishigame/comments/fdhtmr/adult_patch_missing/. Here's the google drive link: https://drive.google.com/open?id=1-CDiOhxbIlQUmhRpBfPCq3Z2td4p0AJi . There's a readme.txt in the zip which instructs u how to use the patch.