Scorp

Doddler made a patch, it have a fix for that annoying UI bug (you certainly saw it, when interface suddenly jump on top and image flips) and some small fixes to script typos and blank lines.
http://blog.mangagamer.org/2015/11/26/kara-no-shojo-2-update-patch-2/

Not hyped.
Never liked any of Key novels, always get bored and sleepy. Too slow. I even was unable to finish Planetarian... Thus they are best when you have insomnia - always worked for me, calm sleep in 15 minutes max.

Everyone's bitter, when someone goes and officially localize something that has been translated for years.

Cartagra, Kara no Shoujo (while protag have to pose as school teacher for small amount of time), Kikokugai, Saya no Uta, Phantom, Policenauts, Snatcher, well, tons, really.

Then most likely could help as well.
So, here is the patch: http://www.mediafire.com/download/lc9igzi8ca72ke8/YUNO_Windows8.1_patch_by_Scorp.zip
Extract into YUNO directory and run or yuno_eng_patch.bat (if you want to patch english version, most likely that's what you need), or yuno_jap_patch.bat (if you want to patch japanese version) and push "Apply" in the popup window.

It was translated years ago. https://docs.google.com/document/d/1P1vFaVBaKvQDwOoa0PiJQibgKokAQvwTm56Cqf_Of3M/edit

I completed it on japanese with machine translator year ago, got maybe 40% of the text, but plot I understood entirely. It is different from original KnS, so it is like Decay said, less thriller, more mystery and tricks. I plan to play the game, but did not decided, what I want to do first - finish remaining routes in Cartagra at last or play KnS2 (KnS2 works SO SLOW, especially intro movie, on my PC, so most probably I would play Cartagra first...).
 
IIRC Sugina told that they will not work on KnS3 before they finish all 4 Flowers seasons... And as there is only 2 seasons completed... Well, I think would be not before 2020 (if would be at all, seeing the problems in japanese industry...).

I am quite disturbed by the amount of blood they every time bleed. It seems authors never ever saw a virgin (or that's just a trend?) as normally there is or no blood at all, or 2-3 blood drops. But in VN it is like girl hold there a 200ml blood package  So absolutely unbelieveable. And such "first case" scenes tend to last and last for SO long, that this is going beyond ridiculous.
That's why my fav h-scenes are in old games. Girls are rarely virgins there, the length (I mean accompanying sluuuuurps etc.) is rather small, comparing to currents ones, and they give you perfect idea, how all happened, no need to describe every single stroke  

1. As I told in other thread these background already present in old release. Just programmer do not show them.
2. Who told they are high-res? Looks like same resx, just upscaled.
3. UI improvement... I would argue, that it is really "improved". I prefer old one.
4. Character portraits were also present before. See your image comparison.
5. Font again I would argue. You actually could select 3-5 different fonts in the setup, there are some looking better than the one on new screenshots.
6. Ehm, what point for that? As I remember names, they all had no sense, as were remakes of classic music, but no original was showed.
7. Where exactly it is "polished"? 100% identical translation, try to find even one different word on screenshots  Anyway, the_noob_avenger along with pondr already did great job and there is nothing to polish more, by me.

So, where exactly that version is superior? In what aspect? Where it is worth 40$ to rebuy worsened version? Nowhere near, by me. That "best possible" look really sloppy rushed cutted version, made for easy money. 
I already supported AB2 by buying japanese boxed version, so what they do here is useless. All I want from them are h-scenes without mosaics, that's the thing I would buy definitely.

One day I will do a patch, which will show full background images. And will implement optional 16:9 and 4:3 resolution change... And auto-crop feature for 16:9 to see fullscreen images the way I described before. It is not hard, I just do not have time before new year at all and these would need testing. So I would have my own free patch, which would have feature which Sekai was not able to deliver. No one is against that, I hope?

All you need is arc_conv from w8m. Version from that github is fine: https://github.com/GAEndGears/majiro-tools/blob/master/arc_conv.7z?raw=true
To unpack .arc (I would assume you use update.arc) type in console: arc_conv update.arc
Folder update.arc~ would be created. Copy one of the files from this folder to the folder above (copy nard00.mjo for ex).
To convert file to text format type (I use nard00.mjo as example): text_conv majiro nard00.mjo > nard00.txt
After you're done with .txt changes, to pack back to .mjo type: text_conv majiro nard00.mjo nard00_.mjo < nard00.txt. This will create file nard00_.mjo in same folder (also initial nard00.mjo file should be present! do not delete it).
After that copy that file nard00_.mjo to update.arc~ folder, delete old nard00.mjo and rename it to nard00.mjo (e.g. replace old nard00.mjo with newly created) and pack it back to update.arc using this: arc_conv.exe --pack majiro update.arc~ update.arc 2 (notice 2 - that's majiro format version, in your update.arc it was V2, so that's why I put 2 here).
You should get newly created update.arc.

WinterfuryZX, I think this is possible to do. I believe even I can do it  Just as we would have only 800x600 4:3 CG they would look kinda bad (in case if they used high-resx and not upscale).
/upd OH SHI~! Look what I found!
Background images are ALREADY high resx 1100x900! They were intentionally cropped before output on screen in the game!! While resource files are still big ones, like this:

So it is absolutely possible to make high-resx version for whole game, I believe that's what AB2 done. And no problem to do a patch which would show scaled width image for 800x600 (and not just part of it like it shows now on Rooke screenshot), without any need to rebuy Sekai version just for backgrounds.
Unfortunately all CG are 800x600, so they seems upscaled them? Or they still had old mockups in higher resx? Will see later.

I suggested this before to my sister, she completed only one route and switched all off, told "Booooooring and repetitive as hell". So seems not the best choice for first VN

If you read this topic closely, I already proposed a way to solve the problem with cut-outs, which could be rather easily implemented in KAG engine (I assume they still use it). About upscale I do not know, if they do a mechanical upscale of the existing 800x600 arts then this is shame, if they have high-res arts and do crops from them - this is better, of course, but still shame as it is still cut-outs. Obv all this blablabla is useless, as SP would not listen and game is on Steam today, but...  Who knows, maybe one day would be a re-release?
Doddler... I have mixed feeling about this person. Same as dovac, I would say he was much better in prior days, when he was doing Grisaia for fans and posting things in the blog for tech things... So now it is hard to say, what  his true feelings are - he have to eat, you know? and he have to do Grisaia 2 & 3, as I understand, for Sekai - and he himself changed, his work changed, the time involved into interaction with VN publishers changed...

Well, that's just his opinion. We all saw screenshots of G-Senjou, and I cannot tell that I like how it looks on 1280 (apart the crop I do not like that screen became very empty, as before there were less width space, so characters looked good, now the scenes with only 1 character look empty). For the bottom text more width is better, as now character image fits perfectly, without text going over head. So I would still prefer old release, as in MY opinion it looks better - maybe just remove some unneeded interface buttons and that's all - but this I can do myself without problem, if I will ever want it - probably would release a patch one day for community with interface mod.

Let me have my ridiculous opinion, ok? I do not believe dovac is the person who does things in sake of community, nowhere near. Dovac before and dovac now seems two complete different persons, he now got lot of conceit and egotism, at least this is how I see it. My mails with questions and suggestions got ignored, my opinion was ridiculed... I was initially very neutral, even positive towards Sekai. But after this mess with 18+ releases and talk with great dovac himself on vndb I got impression that this guy never care about audience he supposed to work for or even want to know anything apart money he got on KS (sort of that was told, I can find you quote, if you want). So by me it is your reasons to see him as white knight are kind of ridiculous, maybe because they still did not chopped to death your favorite VN? Mine was G-Senjou, this is why got so hyped before and so pissed off after.

There is absolutely no problem to do what I told on any version of KAG. Already wrote mail about this and other aspects to Sekai before, never got any response apart dovac telling something like "we do not care about your useless opinions" on vndb. After that I gave up on Sekai completely and decided to never buy games from him  Alas they are sitting tight with millions on KS, so my opinion really would mean nothing to them, as they are aimed on money, not on customers. Also I am completely against things like mosaic, which they even did not tried to take away and against their censoring, which goes against author's initial text and makes all heroines look dull...
So I bought my own copy of G-Senjou no Maou from AB2 Japanese First Press Edition (if I am not mistaken, anyway was coming with huge 400 pages artbook). bought both radio drama CDs and I am happy enough, as with Chikan & the_noob_avenger english translation patch I already have best available version.
 

Yeah, impoverished Raymond working only for fans, eating instant ramen and all going for games... Do you believe this yourself? Imagine, how you got more than $1,400,000 (that's only for KS projects, and how much he got outside that?) and "live impoverished life"?... Unbelieveable, by me.

You left out 'but that's because (traditionally) the standard for prose in VN translations has been suckitudinous.' 

Call it as you want, I will keep supporting companies like Mikandi, (I supported WAS back then because it was a doujin game like i did with many others like world end, tokyo dark, vision of aurora, millia, no one but you etc etc) 
Why should I support something I don't believe in? That every single time they need to answer something important their response is "Due to legal issues..."  i'm not just talking about g-senjou no mou or was,  this is the first time I see a company hiding behind legal stuff so much. Who the hell are they working for the NSA? Isn't sekai suppose to deal with this kind of issues? and if the companies they are dealing with are so bad why do they work for them in the first place? shouldn't they warn the people who are going to support them about it? "hey this is a risky thing to support, the company X put many restrictions on us and we wont be able to share anything with you till the product is released"
 

as far as translation quality goes - people believing those (additional) fundings beeing used to cover most of the translation costs (main games + xtra content) are more than fooling themselves into actually backing inferior crap, simply because they (degica) COULD actually hire professionals only for handling said task by now without having any problems financially in doing so and the fact they WONT is undoubtably a sign of non prioritizing quality first before everything else. no matter how good the actual quality of a fanpatch is, it stays work done by amateurs, which a company clamining professionality shouldnt rely on as a basis for their future product thats costing people alot of money by them getting inavitably an inferior result presented, despite what could have been possible otherwise when non focusing on maximized profit only...:/

I believe you use some bad conversion. There exist 2 conversions - old and newer one, newer one have all routes normally played, as far as I know. I myself played Ever17 on Android using PPSSPP native, but this is not an option for you, at least not by now.

Try to get the most recent convertor, 2 years ago (when I last tried it) convertor had issues which prevented game from going into Sora route.

Then most likely could help as well.
So, here is the patch: http://www.mediafire.com/download/lc9igzi8ca72ke8/YUNO_Windows8.1_patch_by_Scorp.zip
Extract into YUNO directory and run or yuno_eng_patch.bat (if you want to patch english version, most likely that's what you need), or yuno_jap_patch.bat (if you want to patch japanese version) and push "Apply" in the popup window.

You got same error?

puhhh regarding my (forced) cosmopolitan self, born in hokkaido (jp), raised until 12 in tirgu mures (romania, transylvania), then moved to tatabánya (hungary), left home at the age of 17 & went to frankfurt (germany), tried studying archeology until 21 in vienna (austria), took a sabbatical year back in hokkaido at my grandma´s house after having a serious mental breakdown, decided on breaking free out of the clutches of fate & began my 3years long culinary education in salzburg (austria), listened to my heart & started working on the seabourn cruise line for almost 2 years as a chef (asia hongkong route), left my new family reluctantly & went straight to okinawa to get further educated by someone i met on the ship for 3 years, said farewell & backpacked through papua new guinea with a buddy, worked my ass off to get home for free by boarding on a tanker, living & cooking desillusioned ever since at the german/ austrian boarder with having plans of moving to dubrovnic (croatia) nexxt

aside from those longer stays, i´ve took smaller trips & whatever to greece, france, turkey, netherlands, poland, czech republik, tunisia, marocco, colombia, denmark, great britain, italy & singapoore

edit: had an (less) enjoyable time by serving a 2month (waifu-free) sentence for me illegaly crossing the malaysian border....