I love how this beautifully dorky couple is consistently considerate of each other. Them becoming competitive over who gets to the meeting spot first is cute too.
"I've seen how hard you worked over the summer holiday."
"And it makes me... want to try my hardest, too."
They inspire each other. Seems this is what bringing the best out of each other looks like.
Enter the little brother. So he's the one who invites Rintaro for a meal at their house. I'm sure they have all sorts of questions for him... hoping for the best especially approval from her mother. They already have the Chidori vs Kikyo conflict brewing in the background to worry about.