This show is something truly special and by the time I heard the opening theme for the first time I was already head over heels in love with it. It takes a simple premise - two kids meeting and forming a friendship which then develops into romance - and elevates it to a new level.
Not only are the characters incredibly endearing, they are also given a level of complexity and depth which is rare for a romance centered around high school age characters.
For instance, Amane, who has put the idea of romance behind him after a brutal rejection, is not jaded, closed-off, and celibate. Instead he is portrayed as being happily sexually active and secure in his sexuality even if he does eschew romantic relationships.

Furthermore, the progression of Amane and Ryuji's relationship is phenomenal. We get to see Amane slowly opening up and become less defensive especially where his sexuality is concerned. He slowly stops hiding behind barbed quips and preemptive self-deprecation and starts to regain some of his faith in the people around him.
Meanwhile we get to watch Ryuji deliberately opening himself up to the possibility of romance with Amane while still staying true to himself and his own feelings, which he does by being unfailingly honest both with Amane and with himself.

Add to that a beautifully scenic seaside town and an incredible soundtrack and you get one of the most charming and genuine shows I've ever seen. It is truly a rare gem that deserves to be seen and appreciated by straight and queer folk alike.
I simply cannot recommend this story highly enough, I implore any- and everyone to watch it, watch it right now.