Regrettably I haven't actually been able to reach out to them. I have a few other projects already underway that are more important to me at the moment.
While I can speak Japanese, it's...been pretty exhausting to actually reach out to developers and feel like there's a brick wall there.
I will see if I can write an email to them at least. And you're right, They're pretty spotty. Which is fine, I suppose. Please forgive my delays.
Edit: For the record, there is a reasonable chance that Translator++ has become compatible with translating this game. The author of T++ seems to have redone a lot of stuff. Their unpacker broke on this game, even though I've unpacked other games with the same Wolf version, I think?
However, I'm also not presently subscribed to T++, so it will be some time before a version that can actually work for me comes into my hands, if not going the author-route.
This information may be useful to other people, though.