TL;DR, the 'play' and ecchi part really not my cup of tea, but aside from that, I like the tragedy and their development, and Sahana-chan fvcking evil yet so enchanting.
So, when I ask for ""tear-jerking manga recommendation", someone recommended this and seconded by others. Thus as a fan of tragedy, I read, waiting for the part, "when will it be, when will it be" ...And that's where I did it wrong. I appreciated the building of their relationship, but turned out I didn't enjoy their 'play' and the artwork (the part where no girl ever seemed to use bra), and turned out it disturbed me so much that I read while thinking "when will this end... when will I get to the part...". At least I thought, they didn't need 8 volumes really for all those playing. So I was tired and the fact I know tragedy's waiting thus making me waited for it, costed very dearly in the reading enjoyment.
Very heart-breaking in some scenes. Most memorable for me is when
Kurumi's crying so hard in her room after Aiba told her he's saving to bring her to see the waves... When Kyoko said she's glad to have met Kurumi...
and I think I got teary-eyed when
Hideo picked up Kurumi last time in her room in ICU, where Kurumi lied in her bed, looked so fragile and truly seemed as if she's just waiting helplessly for her time to come T__T
I'm so amazed I stared at that panel for some times...