This a personal opinion take it however u want I could care less but is author on drugs whats the point in mellowing out keyaru's personality to the point he started to actually care about the girls last chapter or the chapter before setsuna made a great point on how keyaru changed so much that he let his emotions get the better of him to the point where he may have "weakened"?
Bait the audience with extremely edgy violence so they get hooked, then turn your story into generic fantasy pseudo-tensei slop because, let's face it, you're not a really good writer.
Between this and the artistic nosedive the manga has been through, it's a hell of a downfall.
I think it would be kind of hilarious if the story ended with Keyaru reversing the brainwash on Freya, Kureha and Norn for maximum mindbreak, but at this point I'm expecting them to go "yeah I understand why you did all that we're cool with you".