Oh, and in addition, the only thing I've been hearing people say the two have in common is possibly the setting. Personally, I'd skip Touka Gettan altogether because it's based on Moonlight Lady. Anime: Hentai. Origin: H-Game. (No thanks)
@YukinoX3 Watch this. First, at least. I'm just starting Touka Gettan and it's not as good as this. Also, Touka Gettan was aired in reverse chronological order. And the first episodes have that "Coming-to-an-end" feel that makes it awkward.