This is Kaz' story. Aria's now not the protagonist apparently, and the artist stopped writing her story. New perspective even if we have a character that comes back.
As far as I remember, The Crawling City will continue at some point in the future. I can't remember when or where it was mentioned though. I think twitter?
I know that another artist decided to pick it up from where it left off, or at least that's what I saw, though I don't think Parororo was planning to continue.
I understand that it's a different story but they are connected and, no more crawling city? Dam. Still, I feel like something's changed, aside from the obvious.