Up to 17 chapters, I'm curious about how they develop into romantic relationships. They don't have many silly squabbles; no childish, act normal, serious. Mature, at times. Disagreement? There is, but the destiny that binds them makes acceptance of conditions better. It seems that the bite will come from the different eras in which they came. I reckon that (hopefully) there will be no sacrifice in any form with the involvement of third parties who force entry into their circle. Why am I saying this, because after seeing Mao's condition come and how it dragged him into the present situation. That's quite heavy. And Nanoka came as an answer key for him and at that moment walked side by side with him, forming cooperation from necessity to growing liking ... maybe.
I will repeatedly say: I don't like stubborn classic couples like Inuyasha and Kagome. The difficult situation of Mao and Nanoka is more interesting even I can see more struggle in it.
Rumiko always pulls one scene into chunks of many chapters, so in my opinion so far their main focus hasn't changed since they first met. The monster formula hasn't changed but this classic sensation is a characteristic that sometimes not all authors can do.