Nobody can save me I'm a broken rose /Nana

Nobody can save me
Like a frozen rose
My tears want to sleep peacefully

I need your love
I'm a broken rose
My soul is withering sadness
It's crumbling, I'm a lonely little girl

Continued after the anime and around the time of chapter 84 of the Manga,
Based on what I think may have happened.
Nana is struggling after the events that unfolded and she feels nobody can save her, while Yasu and Hachi try their hardest to get her out of the darkness she's slipping into, but can they save her as things get even further complicated with Nana's health.