Falsetto takes lead of the Minor Trio and transforms Bassdrum and Baritone into new monstrous forms. Meanwhile, Otokichi tells the girls how he once battled Noise and was able to seal away his power, but fears the power of the Melody of Sorrow may awaken him. Ako decides to stay in the human world to help the Pretty Cure defend it. Later, the town has a Halloween festival, and despite having some trouble getting into the mood, Ako soon comes to enjoy it. Soon though, Falsetto appears and creates a Pumpkin Negatone, which Ako is determined to fight on her own before being reminded that she no longer has to. Falsetto's Melody of Sorrow manages to overwhelm Crescendo Tone's power, but the Pretty Cure manage to distract him whilst Ako defeats the Negatone. However, it seems Noise has broken free of its fossil.
プリキュアとして人間界に残るというアコに、優しいパパに戻ったメフィストは残念そうだった。そんななか、加音町では明日にハロウィーンパーティを控え、準備でみんな大忙し。そして当日、みんなで仮装して...。
