Kagura works with the devs but details of their deals are unknown. As far as we know, some devs keep high level of independence of their works (to the point some games were released with censorship because dev didn't agree to have uncensored version) while others might completely sell rights to their works in the west. I don't know details and you don't know it either. You are just assuming stuff.
I worked for Kagura for 4 years no I not assuming anything, I know. TBH I have no love for Kagura in fact considering how badly they fucked me over I would have more reason to sit here and lie and run them down. Just mentioning I used to work for them makes me want to puke.
Kagura is definitely fixing their bugs because most of the time they are causing them (most of their games are fully complete and bug free - after months of patching by devs).
Pay attention they don't have programmers or developers and any bug that needs to be fixed due to translation has to be done by the dev.
Fun fact if a game was truly bug free translating shouldn't cause a bug, meaning the bug was already there just waiting for the right conditions to manifest.
Another fun fact there is no such thing as bug free software they all have bugs and glitches just some are more serious than others and a few are almost unnoticeable. And some bugs and glitches are downright hilarious and are left unfixed and called a "feature".
What I said is true. President Yukino was changed with several events removed or edited to avoid shotas because steam doesn't like it. After that they completely moved to steam game + R18 patch.
No shit loli's and shota's are going to get removed Steam is a US company and have to go by US laws. Although they are little extreme on it but can't really blame they have to much lose to just it let slip by.
Although call it some mythological/folklore creature like a half-ling like they did with Melty's Quest and you can get away with it go figure.
Your assumption that there's no R18 version on steam because either devs or Kagura are being assholes is incorrect. Steam allows R18 but some specific content is not allowed and neither devs or Kagura are willing to censor their games to fit steam's guidelines. After all, main selling point of KG releases is lack of censorship (excluding some clever "trigger word" avoidance...).
I was referring to R-18 patches to games when there is no reason for them. And I said the dev or Publisher, I never singled out Kagura like you seem to be assuming.