Ono has a dream of playing the trumpet in high school. Daisuke has a dream of playing baseball at Koushien. Ono gets a crush on Daisuke, but they decide to give their all to their dreams over love. Thus Aozora Yell is another will-they/won't-they romance with a sports /after school club theme.

I've read other manga by Kazune Kawahara such as High School Debut and Ore Monogatari. Her strength seems to be in writing romances that have pretty ordinary relationship problems rather than tons of drama, and very likeable characters. Aozora Yell, I feel like, does not really play to her strengths. It's essentially a sports / club manga with a romance B plot, but it feels rather bland, lacking the level of excitement you get from other, better examples of the genre. For one thing, their goals are to participate in national level competition, but then it mostly focuses on the mundane-ness of regular practice, rather than the tenseness of competition, or setting up interesting rivals, or any of the other genre tropes that are tropes because they work well. Another weakness is the side characters, which don't feel that well fleshed out to me. If you want manga like this, I'd recommend Chihayafuru, Kono Oto Tomare, and anything by Mitsuru Adachi. Especially Cross Game.

That all said, Aozora Yell isn't bad. It's just that there's much better out there.