In the musical Major Land, a fairy named Hummy is due to sing the Melody of Happiness, which is to spread cheer throughout the land. Meanwhile, Hibiki Hojo and Kanade Minamono, two girls who used to be best friends, have not gotten along with each other for a while. Siren attempts to steal the Golden G-Clefs within their hearts. Noticing their hearts sync up perfectly, Hummy gives Hibiki and Kanade the ability to transform into the Suite PreCures, Cure Melody and Cure Rhythm.