They aren't, but they've always been fine on their own.

[ They're those parents—it doesn't stop Akira from worrying in the back of his mind. It might drive him crazy eventually on top of everything else, but he's cool for now. ]

No, I wouldn't say there's a problem with that unless you think there's a problem. It might even be a good thing.

[ Nanashi can stay focused is what Akira is thinking. ]