Sinned

The current version is based on an original project which was once available under fuwanovel.se and was initially initiated by some Forums members (especially @Emi and @BunnyAdvocate), iirc. At some point, it was "integrated" into Fuwanovel.net, but in a really improvised way and thats still the case today. Unfortunately, its currently not really mobile-friendly, it has a few bugs and yes, as you realized, its game database is also quite outdated these days.
But as KosaKyun already mentioned, we work on a completely new version of it, which will address all these issues. But before we can release a new version of this quiz itself, we first want to have common base for some different features we currently plan for Fuwanovel.net. But once we have this base done, the quiz will be the first thing that will get a remake.
 

Try again.
I made a few changes. It should be fixed now.

I am not sure if this will ever be read, but maybe it gives someone a few hints.
Don't know much about GARbro, but your game uses the KiriKiri 2 engine. You know this since there is a "plugin" folder with krmovie.dll and some other .ddl files that are important for KiriKiri. Also, if you inspect your .exe with a Hexeditor you should find this string here:
TVP(kirikiri) for win32
If I remember this correctly, KiriKiri 2 engine offers a few distribution formats: In most cases, you have to pack your ks files and all the other stuff into archive files (XP3 files) and distribute these together with the krkr.exe file. Or, alternatively, you bundle everything together in a standalone .exe file (called PEXP3), hence just one .exe file and no XP3 files. For your game, the second option should be the case.
In the original KiriKiri SDK (not available anymore since many years), there was a tool called krkrrel.exe or something like that you could use to create XP3/PEXP3 files, but I guess the newer KrKrZ should have something similar. If not, just look if you can find a copy of the old SDK.

I would guess he speaks English too. At least a little. Well, I think it would be worth to try it at least, since such "fan projects" tend to get lost after a while. Making something official out of it would therefore not be the worst thing to do.
Well quite possible. These books are a decade old. But I guess you'll get some old copies on Japanese auction websites and can import them via proxy services, if you want to have one.
Not necessary joining, since I don't think I've enough time to participate here as well. But of course, if I can help you guys with something I will see what I can do. After all, I'm a bit nostalgic about this topic.