The Nikke girls probably won't even notice a difference between their world and the Nier world. Both are horribly depressing.
Well I suppose the one upside on the Nikke Earth, is that humans still exist, but it's little comfort, knowing how many perished. I wonder if this is Nier's Earth, post Automata ending E, or sometime before then, because depending on the time, it can be way worse or better than normal.