I hope people realise that Narumi manipulated Kou through his trauma, he heard she was all alone like he used to be, lost himself in her and gave up fighting due to the guilty he felt for moving on from his mother's death. She triggered his PTSD and Kou thought a relationship would hurt futaba. It's only thanks to Futaba and Kominato did he realise that time wasn't standing still and that it's okay to move forward, to be happy.
I hope people realise that Narumi manipulated Kou through his trauma, he heard she was all alone like he used to be, lost himself in her and gave up fighting due to the guilty he felt for moving on from his mother's death. She triggered his PTSD and Kou thought a relationship would hurt futaba. It's only thanks to Futaba and Kominato did he realise that time wasn't standing still and that it's okay to move forward, to be happy.