Is there an 18+ patch for the re-release of Utawarerumono?

[Outpost Omega J]

Out of curiosity, does the re-release of Utawarerumono (Steam link for reference: https://store.steampowered.com/app/1151450/Utawarerumono_Prelude_to_the_Fallen/) have an 18+ patch? As far as I understand it, the version available on steam is all ages, and I can't seem to find evidence of a patch to restore the adult version content, as is the case with some Steam release titles.

 

I get that the version on steam isn't a direct port of the earlier version available on this website, it has UI and graphical updates, but I can't fathom why the would go to the trouble of redoing an 18+ title and leave out the 18+ content.