She is not rude, she is confident in her own vocal skills. She knew Nako would ruin Into The New World.
Just because Nako can hit high notes doesn't mean theyre nice to listen too.
Was that the only thing she did?
I thought something worse had happened in the upcoming episodes. So... I'm on her side. If I want something or think that something fits better a certain rol , I have to express it! So... I gotta say that I admire her honesty, other people might remain silent just to be seem as humble.
