It is a good short documentary by Orient Extreme for the premier and finally can understand what Ayu said about the song. and yes the media also disappointed that she didnt take part for the press conference.
Translation of Ayu's part:
Im very honored to be welcomed in this high Historical place.
Im very thankful to you to be able to present my song here for the world premier of this movie.
Im very honored to have worked on a masterpiece of Tezuka sensei. It really fascinated me.
I hope to be up to your expectations.
The idea in the creation of this song was obviously love,not necessarily the love of the lovers, the love towards friends, family etc.
It is the love theme that influenced me the most.
I think that this film is the real hymne à l'Amour.
Im sure that you will love the universe of this movie.