The end was rather rushed. I wonder if it got cancelled, or if it's just because it's one of those manga that stop being interesting as soon as the premise wears out. In this case, there's not much that the story can do with the "Akari being a tsundere" schtick once she and Hina actually get together.
Because of this, I tend to prefer stories that can actually keep going once the main couple actually becomes a couple, since not only do they actually show the payoff, but they tend not to revolve around one gimmick.