@InvinCybul I think the last sister will be Ichika. She's known for a long time Miku's feelings, and hasn't done anything about it; so i believe in her chapter she's going to "confront" Miku, and "beat" her, passing with more score (that would stop Miku's goal, because I don't think a confession will occur at the moment).
P.D: Sorry about my english, I'm not very used to writing it.
I love how in one chapter people were arguing about wether the quints' father's parental neglect is considered abuse or not and now people are talking about Japanese v.s. American education system.
Btw in my country passing grade seems to always be 60+ although 60 isn't a pretty number to look at.
people complain Yotsuba never grew as a character in the sense that shes still tied down to the guilt she feels from holding her sisters back but cmon man look at those tears of relief at tye end this was a pretty big step to move forward with them and leave her past guilt behind.