If you already own kara no shoujo, just apply the fan patches and turn it into the HD version. If you want to support this game you can just buy this instead instead of patching.

I just wish there was a patch for this version to use honorifics and Japanese naming like the original. Kara no Shojo gets my vote because of that alone. I had a much easier time keeping track of characters and their relationships to one another with Manga Gamer's translation