The offscreen chapters are there, and they're canon. They will be integrated into the main game on the 25th's pub release as side stories.
As for the 25th chapter, it will be up publicly once the 26th is out, public consensus estimates that it should be in 2 weeks and change.
25th is 2 hours long, and they're teasing that Hime will get hit by a car.
They aren't, OG plan is to release them when Book 3 ends, for idk which tier. I haven't asked them that. Go to their Discord SV and ask LO, he's very responsive.
There's been a recent ban wave on a platform-that-should-not-be-mentioned among AVN creators, and one of the demands from them is to remove connections from pirating sites, such as this one. So as much as they appreciate this community, they have to abstain from communicating here. No idea how long.