Apparently none of the characters actually know what love is. This manga is a clear example of romanticized obsession/stalking/violence/rape. And at the end, no consequences come to the abusers; they all just move on with their lives.
Yashiro - as the saxophonist who's depressed because of the death of the pianist of his band (which happened years ago, to whom he never confessed his love)
Eiji - as the drummer who's a promiscuous, aggressive, sadistic persona, and all kinds of wrong (that obviously preys on those emotionally unstable)
Several characters try to warn off the main lead, and advice him to not engage with this brutal guy,
but he does anyway. Several characters don't see anything wrong going on and actually cheer them up. And then, when a more psychopathic dude is introduced, Eiji tries to "protect" Yashiro from him. Like, really?
The only good thing about this manga is how they explained what was music for them, and their experience with it. But the names of the characters and even all the musical setting resembles Gravitation at some point, but filled with conflict, morbid and nonsense.