>>718218829
You're better off using a VPN and buying it off DLSite desu.

>>718218953
And I replied. Well, partly.
The Steam version is a broken mess if you don't use the +18 patch, that's one difference.
They also changed the text font too for whatever reason. The Steam version uses Lolita instead of the default. You can delete it from the game's folder if you don't like it.
Those are basically the only changes people have noticed.