Chapter 4 naho overheard kana saying “I like you aoi” and aoi replies “I feel the same way”. That same chapter naho also says “wouldn’t everyone love to see a beautiful couple like them” same chaper again naho tells his mum “kana got a boyfriend” so idk why you’re asking me if we read the same thing bc chapter 4 is clearly trying to insinuate that kana and aoi are dating so what else am I supposed to think. I didn’t read past chapter 9 bc like I said in my comment it felt weird to me so I dropped it
Naho misunderstood that they were together, and just went with it. It was only his assumption. Later on, he talks to Kana who was like, "what? I like Aoi as a friend" then showing how they were joking around (remember that Naho covered his ears, so he missed a lot of the convo)
Kana has always liked Naho
Idk chap 9 felt weird and out of place he was dating aoi yet got all on naho??? Like it was obvious it was going to happen but idk the way it happened threw me off