Mephisto invades Kanon Town and sets up a stage to perform the Melody of Sorrow. Aphrodite speaks with Hibiki and Kanade, asking them to believe in Hummy. However, Hummy is kidnapped by Mephisto and is given headphones to amplify the Melody of Sorrow. As Hummy nonetheless expresses her words of friendship to Siren and sings, Siren remembers the good times she spent with her and is moved to tears. As Mephisto tortures Hummy with the Melody of Sorrow, Siren turns against him and tries to free the Notes, but Mephisto turns them into a Negatone. Hummy manages to free herself and the Fairy Tones, allowing the girls to transform. As Mephisto targets Hummy yet again, Siren calls out and transforms into a Pretty Cure and rescues her, whilst Hibiki and Kanade defeat the Negatone. Siren, however, is unable to take everything in and runs off.
音符が全部セイレーンに奪われてしまった。セイレーンが不幸のメロディを歌おうとしているのを、何としてでも止めなければと考える響たち。しかし、こんな状況でも、ハミィはセイレーンを信じると言う。
