If you're looking for a really good manga to read, this has everything for you: great and consistent arts; thoughtful, forward and progressive characters (all of them); a story of friendship and love; a story of self-discovery, -acceptance and -understanding.
The most impressive of all in this manga for me is the communication and thoughtfulness of the characters. I'm a grown adult yet I'm always surprised to see how the characters' thoughts and feelings are all communicated so clearly. Of course, there will be times where they hesitate, they bottleneck, or they refuse to see something new. They all come to accept and understand that: It is OKAY to take time, to be at your own pace, come to your own terms, make your decisions, reflect and continue to go on, go forth, to whichever path and direction no matter the conflicts, confusions or considerations one might have.
Life is a long journey for you, yourself to continuously learn about yourself: to adapt maybe for the better, or to change to how you see fit.
It's great the dialogue too. I still get goosebumps remembering Touma's friends arguing over their stances for him while Ichinose just sits there listening; or how Futaba and Touma have a heart-to-heart conversation about how they feel about the other, about Ichinose, and how they might choose to move forward with themselves and others; or how Masumi describing feelings and words and how we can choose to be non-conformed and it's okay...
I repeat: I'm an adult and I still learn so much from these high school characters!
And with that, the story concludes.
If you're looking for a more traditional, more well-defined/accepted romantic story. This is not it. It's about "self". No matter how vague or ambiguous it or one might be - and we might never know what happen to Ichinose, Touma and Futaba in those two years and five years after high school - be kind and be happy for the decisions they make and will continue to make in the future.