Hibiki Hojo and Kanade Minamino, two girls who have known each other since they were children, tend to argue more and more as they grow up. One day, a magical fairy named Hummy comes from the musical country Major Land to look for the legendary warriors called Pretty Cure, to fight against the king of Minor Land, Mephisto, who tries to spread the Melody of Unhappiness. When the two girls become aware of the danger, they unite and become Pretty Cure to collect the scattered notes of the Melody of Happiness and protect the world!