Hibiki and Kanade become curious about Muse's identity, whilst Hummy informs Aphrodite concerning her as well. The Minor Trio suspect Siren might be Muse, as she has been disappearing for long parts of the day lately. Meanwhile, Hibiki and Kanade have their own suspects, with Hibiki suspecting Waon, and Kanade suspecting her cookery club's president, Seika. As Hummy encounters the Minor Trio as they search for Siren, a Note is found and transformed into a Car Negatone. As Hibiki and Kanade have trouble fighting it, Muse shows herself once again, with her Fairy Tone partner, Dodory, teaching them how to separate their Belltiers, giving them a new technique to defeat the Negatone.
響と奏を助けてくれたのは、仮面のプリキュア・キュアミューズだった。正体不明のプリキュアを、ハミィは新しい仲間だというが、誰も彼女のことを知らない。しかし、その目はどこかで見たことがある気がして...。
