What version to play first if you don't mind me asking?
This one (the VN) is meant to be a stand-alone, so it can be considered a demo to the IF version. Both versions follow the same potline, but I’m adding and expanding scenes and content so as to, hopefully, make the longer version fun and 'new' to read as well.
Personally, I’d recommend playing this one first, if only because the VN is finished.