I've finished Aoi's route. Ultimately I think it only existed as a backdrop or a prologue for something much greater, because it suddenly opened a question that could only be answered by reading through another route. The writing here was so-so, but it just still can't compare to Asuho's or Komomo's. I'd say right now my route ranking would be

Komomo & Asuho (tie) > Kosame > Aoi

I'll be reading Chinami's next now