Why should they worry about unreleased songs? They never took part in the last Love Live so their songs should be term as unreleased right? Unless you count the ones uploaded to the internet which even so, is only a small fraction of out of the total songs they have.
Wait a sec, shouldn’t song writing be having the music first before one can write the lyric or vice versa? And not both done at the same time by 2 different people in 2 separate places? Like that how would they know the music and lyric will sync?
So with the help of convenient plot, they got the song and costume done in time before the show ends. How wonderful. But since Love Live only allow unreleased songs, we won’t get to hear this new song any time soon then? And is only one song enough to last through the entire competition? I guess we will find out.