Wait, this is marked as completed at 15 chapters...? I checked the raws & Otokawa Akari's twitter, and it seems like Kurone-san's serialization has been over for a while... My favorite monthly romance manga is gone...
At least, based on Otokawa-sensei's tweets, they decided to end it on an "upwards trajectory," and seem to be fairly happy about it.
I'm not sure if the conclusion was supposed to happen at chapter 15; Otokawa-sensei mentioned that "they knew [Kurone-san wa Nyaa to Nakanai] would end at Volume 3 for a long time," but I'm not sure if this means "Kurone-san was supposed to be a 3-volumes series" or "I received news of Kurone-san's cancellation rather early." If anyone knows more about this, could you please inform me? Thanks :D
Either way, I'm definitely supporting Otokawa-sensei's future works. This was a truly special read.