This VN seems to run pretty well to start off with, but a few tweaks are needed for a good experience. First, I start with a clean 64-bit prefix (wine 7.19 on Fedora 36).

I'm not 100% sure if this was necessary or not (I already forgot), but I'm pretty sure you need winetricks quartz for video playback support. At least it's installed in my prefix, and I don't install things for no reason :)

Next, the game by default doesn't seem to install the font it wants. The result in my case was that it picked up an ugly-ish monospace font. It's not unreadable, but being wider than the intended font, you may find that the text on some screens (e.g. scrollback) cuts off at the right edge.

The first three parts come with an installer for the intended font (if you look under font/ directory), but these did not work for me. Instead, I found the required font online (Overlock-Mod2_j.ttf). Note that there are two variants of the overclock mod font and one will have issues with the j character (it's too wide or something).. apparently the _j version is the correct one, but the game *may* look for it under the original name. So I copied that over to drive_c/windows/Fonts/Overclock-Mod.ttf. Text fixed.

Now instead of looking for the font online or trying to fix the broken installer, you'll be happy to find that the final part (Hiver) has a copy of Overlock-Mod2_j.ttf that isn't wrapped in a silly installer, again under font/. So grab that! MD5 sum: 1c157d78f032e498c07e0b6873a8eff8.

Finally, Hiver seems to have a dll injector that patches the game. Regardless of the font setup that fixed the previous three titles, you'll once again run into terrible looking text. By default, wine doesn't load the injector; it's d3d9.dll. Fix by adding an override for d3d9 (native, builtin) in winecfg under Libraries.

After doing that, Hiver will crash at startup.. fix that using winetricks vcrun2019. Now everyhting should look fine. I've yet to finish Hiver though. [EDIT: finished without any problems!]

I guess this is more of a note to self, but if it helps somebody else.. great.

Hi, fellow Linux user, yuri reader, and DRM-free game purchaser here. I appreciate this post! Though personally I would've submitted this to WineHQ's App Database. https://appdb.winehq.org/

For the font installer: the installer actually worked for me without a problem, note that I'm running Wine 8.20-staging on Arch Linux. It generated a font file in $WINEPREFIX/drive_c/windows/Fonts, and the game picked up properly. But it's weird that it did not get installed alongside the game.

Actually I wonder if the font issue is even unique to Linux or not. I noticed an "installscript.vdf" file next to the font installer, I know that this is something that Steam's installer would've picked up, but I don't think the GOG installer would've done anything with it? Either way, thanks for finding that installer.

For the video cutscenes: they too worked for me out-of-the-box, sorta. I had installed lib32-gst-plugins-good, lib32-gst-plugins-bad, and lib32-gst-plugins-ugly, and that seemed to be enough to display video without installing winetricks quartz. But this did not play audio during cutscenes, and winetricks quartz didn't help. Did anyone manage to get sound working in the cutscenes?

Nevermind, spoke too soon. Not only does it not play the audio properly, it also then crashes after the video is done.

I did some fun experimentation to try to fix this, but this ultimately didn't really lead anywhere, so you can skip to TL;DR for the actual solution.

I did some messing around with the game's files to try to get around this. I tried removing video.iga from the game folder and seeing what happens. The game crashes if you do this, but what's really strange is that when the file is removed, the game creates an empty folder named "video" in the install directory - that folder wasn't there before. So apparently if the .iga archive is gone, it tries instead to find a video in uncompressed form in that directory.

So my next step was seeing what kind of file it expects to find. For this I needed to decompress video.iga to see what was inside it, but .iga seems to be some proprietary archive format made specifically by Innocent Grey. Luckily some person on the internet made an unarchiving tool for it. Apparently there is only one video file, called op.mpg.

So I tried inserting random video files but renaming them to `video/op.mpg` in the game folder. It sorta works and I managed to insert custom video clips into the game, but still I couldn't get any audio to work, and it would always crash afterward. Sadly it seems like the game engine expects very specific codecs to be there, but Wine can't play these codecs on my machine, even when I have all the GStreamer plugins.

TL;DR: uhhh apparently you can just go into the game's options and disable video playback there. Yeah I didn't notice this before... The game seems to work perfectly after that.

My suspicion was right, the font installation doesn't work on Windows, either...