Do to unexpected events, WUG is forced to learn a new song with no time remaining.
Not only that, but the song and choreography are far more difficult than the songs they've done before.
Idol Festival 
@ I-1 Arena
Idol Festival 
@ I-1 Arena
Festival de Idols @ I-1 Arena
Festival de idols
 @ I-1 Arena
Idol Festival 
@ I-1 Arena