Whew, sorry for the necro-bump, but just finished the VN and all the routes too! I did it without any walkthroughs, so it took me a few tries to get to Mifuyu's route.
Play order:
Chisato -> Satsuki -> Michiru -> Isara -> Mifuyu
Best Route (Best to worst):
Mifuyu = Satuski -> Chisato -> Isara -> Michiru
Best Girl (Best to worst):
Satsuki = Mifuyu -> Chisato -> Isara -> Michiru
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