So yes it has been a year, but the only thing that we know from that entire year is that the following day after going to karaoke she was back to acting like she always did, hell she was back to her old self by the end of the same chapter.
We never got an internal monologue from her, and the topic was never addressed, all we got was her outer facade which remained unchanged for the entire series, she of course was never a main character not even when we learnt what happened to her, but then after that she became practically a background character, and i was hoping for the opposite to happen.
Some extremely important changes must have happened off-panel (i assume, it has been a year) to the point that whatever they talked on that rooftop is now not worth bringing back, that or...
Maybe she never took his words at face value, the key things that day were the intentions behind Takayanagi's words and not the contents, the promise itself was never important, and it was in that very moment with the power of good humor that she moved on from her assault, she understood that she was not damaged, that she had value beyond her body and experiences, that there was more to her life and that regardless of what happened people still appreciated her and thus that she should appreciate herself, it all happened in that one moment, and then she went to karaoke to get some catharsis and complete her mental recovery... i don't believe in the second option, i believe that she went under a lengthy process.
So what happened In that year? did she bury what occurred to her an her worries and is now living in denial? did she wait for a year to the mixer with Takayanagi? or did she got over that promise, or did she never took that promise seriously? what is motivating her to keep on living now? what did she found to sustain herself? is it her new found friendship with Miyuki? did she went through the proper channels to report her rapists? did she got herself checked for possible STIs? has she gone to therapy to deal with the violent event that occurred to her? has she started dating again after her first boyfriend ever gang raped her and drugged her? Were the after class talks with Takayanagi and the other girls her only form of counselling? does she still want to become a bride or is she aiming for something else in life?
When i say quickly, i don't mean that she recovered instantly that day, what i mean is that we didn't got to see how this girl dealt with what happened to her, the way the story is presented it never focused on her.