As Nonoka, Yuzuki and Koharu near the gravesite of Nonoka’s mother, the day turns cold, cloudy, and grey. I just so happened to myself watching it on a cold, cloudy grey day. While it was just a coincidence for me, for Nonoka the weather reflects her mood; she hasn’t visited her mother’s grave in some time, because she’s been afraid.
And not because her mother was a mean-spirited, fearful woman — precisely the opposite: she was as kind and loving a soul as one could ever hope to meet, and a wonderful mother to boot. But then she got sick, and didn’t get better, and they moved to Tokyo where she could get care, but she died anyway, leaving a massive hole in Nonoka’s heart.
Nonoka patched that hole, which was causing so much grief and pain, by essentially letting go of her life before her mother died, and moving forward as if none of it ever happened. In the process, she forgot about a great many other things, like her promise to her friends; something Shione still hasn’t forgiven her for, though Koharu and Yuzuki surely have, and now probably feel a bit silly for ever being angry at Nonoka for moving, something she had to do suddenly for her mother’s sake.
In the B-plot, Noel, who can’t accompany Nonoka because the cemetery is out of saucer range, sticks with Souta, who is again stuck minding Koharu’s family’s store. Noel breaks the monster photo board thingy, and breaks it again while trying to fix it. After some little-kid negotiations, Souta convinces Noel to assist him in fixing the monster. As with Nonoka’s psyche, the repairs are quick and imperfect, but unlike Nonoka, it doesn’t matter; just as the monster was originally built by Souta, Koharu and Yuzuki as a labor of love, repairing it was a similarly rewarding experience between Souta and Noel, and when Yuzuki and Koharu see their handiwork, they approve.
As for Shione, she’s in an unenviable situation where she’s held Nonoka to task for so long over lying and breaking her promises that now, even if Nonoka or the others were to explain the very understandable circumstances surrounding what Nonoka did, Shione still seems too proud — or too scared, or both — to lose face by softening her stance or letting Nonoka back into her life. After all, intentional or not Nonoka hurt her deeply.
It was Nonoka’s mother who allowed Nonoka to become friends with Shione in the first place, by reminding her to smile when meeting new people, especially shy ones like Shione. And yes, it was Nonoka’s mother who indirectly drove the two apart by being the reason Nonoka had to move away and abandon Shione. But when a snowflake melts in Shione’s hand at the cemetery, and when she arrives at places just before or just after Nonoka was there — they’re signs that Shione is ever-so-gradually warming to the idea of reconciliation. She just won’t be rushed.