I think that at this point Aya already knows she doesn’t see Mitsuki the same as her other friends. She might have no put it into words yet, but when she broke down in frustration thinking “What do I have to do to get this through to her?” it felt more like heartbreak that someone you really want to get close to doesn’t get how much you see them as special.
I might be insensitive but I don’t think one would cry like that over someone they just wanted to be friends with. Call them an idiot, would say they wanted to get closer is normal, but the level of frustration Aya showed makes me think she never took Mitsuki out of the “romantic interest” place in her mind. It’s just that since it’s a girl putting it into words (which would mean a realisation about one’s own sexuality) is not an easy process.
That makes me think… Will the story continue after the physical release in April? If not, we only have 8 chapters left for Aya to realise it and tell Mitsuki. That’s just 32 pages and imo it’s a bit too early (??)
Anyways, as long as the author ends the story in a nice way I won’t complain about the pacing.