I was completely lost about what are you talking about, then I remember she sang BLUE BIRD chorus with different lyrics during the interview. Who did that cover and what's the context of it? It's a different version with new lyrics?

From what I understood (I don't speak japanese very well, so feel free to correct me), she teased the comedy duo (they aren't singers) that the song they did for a 2019 sketch/show had the same melody as BLUE BIRD, but I guess they denied at first that ayu's song was the inspiration behind it? (not in a rude way, so no need to hate on them, one of them was a fan ^^)

Which explains the different lyrics (and no credit for ayu): it's not an official cover althought same chorus melody

She dresses like a CEO in a cosmetic company in this preformance.

We gotta be careful what's foundation ♫

We gotta be careful what's fiction ♫

I really cannot hear N, it is no fiction.
Wow, aside from occasional baby voice it was so surprisingly good. Usually her voice does not sound like it is coming out naturally at all, but here she sounds natural for the most part and I love it. And of course no screaming which is fantastic.