>>124684552They have discovered a means to communicate with each other in the end and they need each other dearly - Rin says so herself and judging by Hisao's mental state in this route he can't think of anything but her really.
I think the beauty of Rin's storyline is that it's deep down a very simple story - all the time Hisao tries to communicate with her through words, fails and is frustrated while she tries to communicate with him through her painting and fails and is frustrated in turn. All the time Hisao comes to visit her in the studio she is constantly trying to communicate with him, every second of every day, through her painting. As she sees that he still doesn't understand her she feels the need to try even harder, until she feels the need to destroy her completely and has her breakdown.
Then by accident they discover that they can communicate: through body contact and sex. I think Rin is the first who realizes that this works much better for the both of them than anything they tried before, while (poor) Hisao thinks that she is finally returning his feelings and gets naturally upset at her "mixed signals". I could understand him really well when he finally couldn't take it anymore.
The saddest part for me was really realizing how desperately she tried to communicate to Hisao, all the time, and that she was feeling deeply for him too. It was so sad to see her so upset at all the questions at her exhibition and when she says to her art teacher that the exhibition didn't matter, that not even Hisao understood her.
Well, gladly he (and the reader!) gets it in the end and it works out fine. I don't want to say Rin would be any less quirky and unique in the future, and I wouldn't really like to see that happen, but I think they found a way to understand each other and it's okay if they don't entirely all the time.