After Cure Muse completed her mission to restore her father's kind heart, Ako and Mephisto made plans to go back to Major Land together. But then a strange howling sound echoed across the city, and once it faded, all music had vanished. When Ako and Mephisto tried to reach Major Land, they got no reply.
Worried, Hibiki and the others traveled to Major Land, only to find it unrecognizable—a place once filled with music now completely silent. The world was barren, without any sound, and its people were emotionless like statues, still playing their instruments but producing no music. Only Ako's friend Suzu remained, and she explained that Aphrodite had suddenly changed and taken all the music from the land. Unwilling to believe this, Ako and Mephisto set out for the palace to find Aphrodite and learn the truth. Meanwhile, Hibiki, Kanade, and Ellen chased after Suzu, who had run off after Ako refused to trust her story.
While pursuing Suzu, the girls encountered three men trying to steal the Healing Chest. As the truth began to emerge, the Pretty Cure had to confront the true enemy.