After Adagio Dazzle, Aria Blaze and Sonata Dusk get defeated by the Rainbooms on the battle of the bands they start to change.

Aria grows closer to Sonata and goes through an experience which is completely new to her/them.
She starts to feel guilty about what she and her friends had done but mostly about how she treated Sonata over centuries.

Sunset Shimmer wants to help them and offers her friendship. Will they accept her offer?