For those of us who can't read it, what exactly is going on?

It kinda looks like the girl dies at the end but considering the face of the person in the cow costume at the end it seems like the girl wasn't killed and fed to others? Though that could just be wishful thinking and hoping that this was just kinky and not snuff.

Base +8, sartrouse +5, Lirula +6, S_zk +5

I think it's just kink.
At the very least, the DLsite doesn't list snuff.

There's an English part, apparently? Maybe if they upload that we might be able to understand better, but this seems just like some really heavy S/M

Base +6, Vagic +6

There is indeed English version - https://img.dlsite.jp/modpub/images2/work/doujin/RJ298000/RJ297881_img_smp1.jpg

This is probably the best work of "Gentleman Conglomerate" so far if you discount this one - /g/1479329/490309b789/

Eternal glory to the person who uploads the English version (or just the whole thing).

Base +11, asdfzxc920 +6, AkatsukiAogawa +3

Base +5