Special mention: while Suzume and Kazuya are crossing the river Yumemi recalls the time in second grade where she and Suzume were in the same class. Their class was going on a field trip but Yumemi ended up with a fever the day of and so couldn't go. When Suzume found out about it she walked all the way back from the neighbouring town the class was at; just so she could keep their promise to eat lunch together.
Munto and Yumemi's relationship. Many small moments throughout the series give glimpses into the deep connection the two of them share.
Best example comes near the finale where Munto reaches out and saves Yumemi from despair gained from the Mirror Trial.
And of course, in the grand finale when he practically out right confesses to her:
Munto: "It seems like I'm being lectured by you again. I finally understand now. It's just as you said. The one I should protect is already here."