The default route when you play without Realm 2 data is the witch path.
Thanks for pointing out that glossary typo. It's a running joke between my partner and I that she always gets their names muddled. And to my embarrassment, I implemented them wrong in the glossary

I've fixed that now for the next release!
In response to the part about the remaster, Realm 1 hasn't been touched. No enhancements have been made to Realm 1 since our original releases.
For Realm 2, the remaster involved re-lighting numerous images and touching up and re-lighting animations, and we added several more animations and more angles to existing NSFW animations. These were all re-rendered and implemented in v0.21.
And regarding closing off characters:
there will be points in the game where characters can no longer be encountered if you make certain choices (these choices will be pretty clear). In the case of Kagome, Lilin and Seraphina, the characters opposite to the side you allied with won't be closed off. There will be variations in your interactions with them, but you will still be able to access their "side paths" with some variation.
Glad you're enjoying the game!