You missing 3 major chapter (2 natsumi ones, 1 satoko one) and drowning chapter. I think if you do the orbs they open, drowning chapter is other choice in catkilling.
There even more after that.
Played trough disaster awakening and before midnight, would like to report two small things. In before midnight hanyuu starts with the two healing moves but then also learns them by level up so you then have them twice in your skill list. And secondly after disaster awakening the game plays the credits no matter if there's still chapters left. Unless that is intended then nevermind.
There few more short chapters in the first area. -after chapter i think you need good end of before midnight. Order 34 is if get hanyuu miracle stuff done.
I glad you like tomitake quest. There a lot of small quests like that in the game if you see hints to their unlocks.
But satoshi and irie sub chapters is as far as i got, i planned for more in that area.
Do you have twitter or discord, i can send spoiler hints of looking for more.