I didn't finish this. I won't finish it. After chapter 65 I just can't care anymore, and I should have quit at chapter 10.
Hirunaka no Ryuusei is kind of boring and Shishio Satsuki is a creep. The mangaka has a section where she explains the original plot before the editors tore it to pieces, and apparently Shishio was originally a classmate and not an emotionally stunted 24-year-old man hitting on a 15-year-old girl. Suzume starting to date Mamura was the best thing that happened to anyone in this manga, but them dating is pretty boring too.
...but the art is beyond stunning. It seems like
everyone raves about the art, and it keeps quite a few people reading. That's how it seemed to be for me.
Also, Suzume is a really likeable protagonist, and if Shishio wasn't interfering with things she would have been a really strong character. Instead she spends a lot of time moping about him because...well, I guess that's the plot.