For all the ppls asking "why is it still tagged as ongoing ?" it's because there's still one chapter left for like the "afterstory" to follow what they did and became.
That's why the mangaka wrote "to be concluded" on last page.
On the other end was really sweet, thanks for the translation as always. Much love
I suppose that the prediction of the mother didn't came true because that day she didn't meet Kuroneko's boyfriend, but her husband. Or he truly changed the destiny.