I am a little concerned about the concept of Anko leaving the harem. Mostly due to the fact that out of all the individuals in the narutoverse, one of the only people who understands her pain is Naruto. Not to mention, after reading the lines of Anko wanting 'kinkier' things to occur, I looked back and I don't recall her ever making requests to Naruto about that. I mean, I'm pretty sure he would do it to please his lovers if he was asked about it. Not to mention that if you think about it, this concept seems to have come out of left field, there was no build up to the idea of Anko wanting more kinky sex, and there also wasn't any lingering doubts in her thinking that she might want to explore further into the concept of intimacy.
If she asked Naruto about this concept I'm pretty sure he would consider it since he has pretty much done whatever he can to maintain his lovers.
I am a little sad that Guren is apparently gone, she was one of my favorite filler characters to be honest...
Anyway, I still say that it seems a little rushed for Anko to have this sudden change. I am also a little curious as to what brought up this sudden change. I can understand her wanting to explore, but the thing is shouldn't there have a been a scene or more showing her wanting to find out more about intimacy? Also, it seems a little odd that she wants to leave the group considering that Naruto honestly seem to be the only individual who has given her a legitimate chance into his heart.
It just feels slightly rushed is all, and it doesn't feel natural when it comes to her character... It does in some context, like the thought of going further, but she hasn't really spoken to Naruto about it going further... Unless maybe Hinata is going to try and talk to Anko about this and see what is going on and find out about this and find a ay to remedy it; mostly because I don't think Hinata would want to see Naruto go back down into a depressed state of mind.
I will send more of a detailed review when I am actually able to get a little rest, because right now I am really tired.