It can be found as DLC for the game on the Steam Store: The Ditzy Demons Are in Love With Me - 18+ Adult Only Content
If the Steam Store page isn't working, you may be able to install it by either clicking the following command or running it directly on your PC: steam://run/948430
Note that this will immediately run the game and start downloading the DLC if possible - you may need to close the game and wait until the DLC finishes downloading for the patch to work.
There is a patch available, but it has to be bought from the Denpasoft website.
Patch download: https://denpasoft.com/collections/all-games/products/the-ditzy-demons-are-in-love-with-me-18-dlc?rfsn=2373751.64f308&utm_source=refersion&utm_medium=affiliate&utm_campaign=2373751.64f308
Steam store: https://store.steampowered.com/app/802870
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