I read Ao Natsu on a night, and I thought I'd read a few chapters and then leave it for the next day. What actually happened was, I binge read the whole series that night.
Why you ask? Is it not just another of those shojo romances where the heroine goes kyaah and the hero swoops down every now and then and kisses her? Nope. Ao Natsu is a real breakaway from the usual shojo romances. I mean you have the typical high school romance setting and all, but it's so much better.
For starters, there's no stupid drama and love triangles! God bless! The story is cute, like really cute and it made me think what a useless shit I've been in school, wasting my summers doing only homework and studies.
The characters are great. You really want to root for the couple from the start and you just want everyone to be happy. Like seriously, there's not a single girl or guy you'll come to hate in the manga? Strange for a shojo right?
Overall, I enjoyed the manga. I do have some quirks with it, but yeah it's good. Makes you question your life a bit in a good way and makes you believe in all the fated love and stuff(tho it's not happening for me, idk why duh).
Just go and read it. 39 chapters is not much and will hardly take 2 hours. Ao Natsu deserves those 2 hours from your life.