Someone sent me this on a Discord DM about the Kagura Games' titles:
on the Japanese versions of games i think you'll find it unlikely for any game for 1 of 2 reasons:
1. The publisher doesn't wants price and/or contract exclusion from the Japanese market (which is often willing to pay more).
2. Publisher doesn't have the legal rights, because the publisher only has the rights to the translated version, and the untranslated version would require a separate installer (since the kagura games games appear to be RPG maker games, this makes sense since, as far as i'm aware, there's no normal way to switch langauges)
However, while ia haven't looked at the kagura games releases in particular, i've noticed a few of the games here can be found on dlsite, where you can usually get these games DRM-free
There's a fewf games there that are DRM-free that were delited from GOG (Chantelise, Recettear, etc)
A bit later:
Ah, decided to try a random one: dlsite.com/maniax/work/=/product_id/RJ211260.html
That's "Dungeon Town," and apparently the japanese version may have more features than the english release
The one with the rights is ねこまか, not Kagura Games
Since Kagura Games focuses on publishing Japanese titles overseas, perhaps who published the Japanese version only allowed the original language to be featured on Steam, maybe due to having to go out of your way to find the uncensor patches and uncensored porn being illegal in Japan. Only supposition, tho, and I don't think Kagura Games will make the situation clear, as it could involve legal agreements.