Yes this is the end. There's still extras for volume 3 coming, in September, and it might be longer than usual considering this volume was suspiciously a full chapter short on the page count.
But it's safe to say it was axed. There's some unnatural circumstances, especially the sudden hiatuses, and it felt like this chapter was racing through plot points that easily could have taken up more chapters, assuming this was the intended conclusion.
All things told, I think it wrapped up nicely. There's some great payoffs with Haru returning to how she was in chapter 1, Haru seeing herself in Hinoto, Haru tearing up the marriage certificate, the way they traded suffering over each other over the course of the manga, and them finally having absolutely nothing left.
Also more manga seriously need to end with the protagonists saying, "Fuck it all, let's just have sex all day."
It's a happy enough ending: they recognize their true happiness is each other and are willing to suffer through the grind together. But I don't think for a moment this was Keyyan's original vision. It just doesn't add up thematically, coming up weak if they're simply meant to be 2 dumb kids who got in over their heads and returned to life. The story needed more ups and downs for that to work, instead of one big fall before quickly calling it quits. And the message of "just have a girlfriend who'll die for you" isn't likely to resonate with those sympathizing with their situation. As much as I love Haru and Hinoto's never-ending commitment to one another.
So while I admire Keyyan's ability to make the best of this, and I'm happy it wasn't KitaKawa 2, I'm pretty dissatisfied. As you might be able to tell by the credits page.
Seriously, I'm going to jump off a bridge if The Princess of Sylph doesn't make it. A short bridge but it'll hurt my ankles.