I love Nukarus interpretation
Anyway ayu in this video totally reminded me of Holden of Catcher in the Rye with the seeming fascination with children
Like in the book. Ayu is at peace watching them. Enjoying their innocence. Their happiness. A nice life
But also like in the book her childhoos wasn't like this. It wasn't totally happy. And when they are taken out of this happy realm of seeing kids enjoying themselves they are taken back to their real lives. Difficult lives. Without the brightness of children

And both seem to not have the ability to completely grow up.
But I don't think that's the theme at all especially with the song. I think what Nukaru said is nice and I agree with it. I was just making an allusion to the book.
I do sometimes wish these weren't left t o endless interpretation lol.
Anyway I LOVE this pv