First, I dare to say that this is not for you who expect Yaoi, as in most Yaoi fangirls would like (no climax, no meaning, and focus only on before sex-sex-after sex situation). This is for you who wants tragic, life drama with boy x boy as the main character. So don't start this series with the expectation of "Kay I'm reading BL romance, where's the lovey dovey?? Where's the gaysex??" , you'll find this series boring. Just treat it as general manga, read it carefully, and digest the conversation (the scanlation team did a great job, but it was really hard to convey the depth of the real japanese conversation into english) because heck, even the words are beautiful.
Second, people have tendencies to underestimate major opinion, sometimes without realization, one of the reasons was because they've already swayed/ expect too much. So make sure you're on a blank, emotionless and objective state when you start reading this.
Third, read the genre carefully ladies. It said "Tragedy". It's dark. So don't start reading this series only to complain about how there are so many beatings/rape/murders along the way because you shouldve guessed it. Unless someone tricked you, forcing you to buy the manga by saying that it was a series about fruity-colored highschool romance , stop the rude complains. I doubt it you even buy the originals anyway.
With that, feel free to welcome sex on the piano ..... and hating Watase Yuu more than before because of the ending