Man, Magpie is awesome.
I just started reading Making Lovers and was slightly annoyed by how blurry everything looked compared to the delightful 1440p of Kinkoi, which I finished a few days ago. (It turned out to be a great read; especially the final route. Can't go into any details without spoiling it though, so I'll just leave it at that.)
Aaanyway, the whole "blurry" situation was easily remedied thanks to this wondrous app. I don't know how it works from a technical standpoint, but it basically lets you sharpen the image through upscaling. If you haven't tried it out already, I highly recommend doing so. You can pick it up here, and then you just boot it up, choose which filter to use (Anime4K has some serious sharpening, but I think I prefer the slightly less defined ACNet option), launch whichever VN you want to use it in and hit Alt + F11 when you're in windowed mode.
Unfortunately, the upscaling forces the game into fullscreen, so I think you're out of luck if you prefer playing in windowed mode. For me personally, I always play in fullscreen anyway, so that part doesn't bother me.
In any case, here's a comparison shot of the original image and one with the Anime4K filter I mentioned above.
Original:
Anime4K:
I suggest you open the images in separate tabs and switch between them, as that makes the difference a lot clearer. Also, it's obviously much more apparent on a large screen. I dunno how much of a difference it makes on a laptop or the like.