Your favorite characters are back in an all-new royal adventure! It seems that a mysterious “Z” is appearing as a mark on the palace residents. Who is behind the mark and what does it mean? Princess Odette, Derek, Scully and all the Swan Princess friends work as a team to uncover the secret.

Princess Odette is hosting a music competition to celebrate Princess Alise's birthday. Prince Li of Cathay has entered, but his sister Princess Mei Li has stowed away on his ship to seek help from Odette and Derek for Chen, who has been cursed to live as a dragon. Who will win the music festival and will Chen ever be free from his curse?