I was randomly searching through an ebay doujinshi store that someone linked me, and came across the Tsukihime section. And in there, I came across this:

As I looked at that cover and the example pages, I instantly recognised the style, going “OMG!!!!!!” inside my head. I had no idea that “MIX-ISM” was a name that Sekihiko Inui used – and he made a Tsukihime doujinshi??? It’s strange, I guess I have become a bit of a fan since I react this way.

I really want that doujinshi now….