The Picture Book's Secret! What is a Princess?.Haruka and Yui learn that Yume Mochizuki, the author of Haruka's favorite book, The Flower Princess, is holding an autograph session. Upon meeting Yume, Haruka becomes downhearted upon hearing that she has no plans to continue the story. Yume explains this is because so many fans had different ideas for the princess' future that she felt it more appropriate to leave things to the reader's imagination. Just then, Twilight appears, trapping everyone in glass mirrors in order to draw power from their despair. Overwhelming the Cures with her power, Twilight attempts to burn Haruka's book but Haruka protects it, believing in Yume's words to try to become her own princess and awakening the Lily Miracle Dress-Up Key. Combining her new power with Minami and Kirara's new keys, Haruka and the Cures beat Twilight back with the Trinity Explosion attack. Later, it is revealed that Yume is also the principal of Noble Academy.