Magical Star Kanon 100%!

Elsie sees an ad for an audition to play Kanon's little sister in a TV drama, and so she flies over to the studio. On the way there she encounters a Runaway Spirit that enters the studio and transforms Kanon into a child, right before the auditions she is supposed to be judging. Kanon and Elsie must work together to capture the Runaway Spirit and save the auditioners.