Seriously same, I was pretty sure I was the only one who was sad that this game ended the way it did. It was a sad reminder of the real world and how no one is a simple type of person, and how we all have our own stories, some which are sadder than others (Natsuki or Sayouri) - like seriously oooof.
(Also yeah I'm 14 so this might just be teenage angst _/ '-'\_)