I mean, after these last few chapters - the last 2, specifically - there's no way that we aren't on track for some great development. Koguma clearly understands that 'things can't be the same', but thankfully, the ending shows that at least their relationship isn't destroyed, as sad as a wasted summer is. Now, they can only move up from here.
Hino looks so mature in that last panel too.
Man, I can't wait to see how this continues to move forward. $100 bucks on Hino asking Koguma if she's wearing panties under her yukata, or if she's being traditional about it.