I finished Natsume's route today. Good route, but it felt kind of short? Maybe I was just in the groove the last couple of days and have been reading without getting distracted. Maybe it was the pacing. This route had the least to do with the supernatural plot (outside of Suzune's sub route); you could have not included the butterflies in it and there wouldn't have been a difference. I'm sure that will go in the opposite direction with Kanna's route next, the last route in the game for me.
I'll kind of work in reverse now and post some of the screenshots from where I left off last night.