I really loved the way Oneone1 refined the systems in each game, especially Samurai Vandalism since being a total slut didn't ruin the chances of a good ending and going naked wasn't route locked, but I still had a lot of criticisms with that game overall.
Witch of Eclipse was a lot better but ultimately I felt like the custom engine they were using was unpolished.
So I'm REALLY GLAD they went back to RPGM for this one and still were able to iterate on those two games. It feels a lot sleeker, more polished and runs better on those games.
And of course, for me, the greatest improvement of all: YOU CAN UNLOCK NUDITY IN THE COMMON ROUTE. No longer have to unlock it at a different point per route because it's entirely before the route split. The flowchart's a bit misleading so I'll need to experiment a little more to see exactly the earliest you can get it, but basically you just need to get Exhibitionism to A and Lewdness to B, then do the naked sidequests as they're unlocked in the story.
Ok I tested a few ways to make sure so I can confidently explain how to unlock nudity.
The only statistical requirements are Lewdness B and Exhibitionism A. That's it. No virginities taken or actual sex acts required, and you don't need to pick a specific route. You can farm lewdness with masturbation or harassment events, and exhibitionism by using the public bath at night and talking to one of the girls there. I prefer the top right.
If you have lewdness C and Exhibitionism B, you can advance the naked girls event that pops up in the girl's dorm, and unlock the school midnight exposure walk. Once you do that event, continue the story until you have access to Iris Headquarters and are asked to help with finding a runaway student by Reina. The current in-progress event should be "Chasing after a runaway student". If you have the statistical requirements AND did the midnight exposure event, then you'll unlock the next part of the event at Iris Headquarters. Do that event, then go to the men's bath at night, and you'll unlock nudity.
Note that you have to do all of this for each character (which does mean you can do only one of them if you're into cfnf).
Also once you have the feature unlocked for both characters you can find exhibitionism events here or there. Repeat them a few times to unlock a side episode focused on exhibitionism.
You can also press W to quickly dress or undress, and can also do so for free in battle, no turn cost.