It didn't seem axed to me at all. It was a complete story about a girl running away with an engaged love-interest and successfully stealing her away from a bad situation. It is not like they could have ran away forever, and I don't think it was ever planned to last forever. I thought it had ended with the previous chapter, so having a decent epilogue chapter is nice.
Rather than being jealous, to me it look more like Neon was irritated that the idol had pretty much turned Nono into a gofor (requesting more service than expected for her role, and blinding Nono with star-power from noticing or caring about it).
I am quite surprised that I never noticed that this was by Itou Hachi until I got to the moments. Maybe it is because it's late here. Or maybe the general style beyond the onee-loli is too different (Never thought a story would start with a plan for butchering a child).