The main character, Sakura Uta, is a second-year middle school student who loves to sing. One day, she meets the fairy Purirun that has come to search for the Legendary Protectors, Idol Precure! Purirun's hometown, KirakiLand has been plunged into total darkness by Darkine, the boss of the Chokkiri Gang. Meanwhile, the sparkles of the townspeople are being stolen by the Chokkiri Gang... it's a huge pinch!

"I want to make it sparkle sparkly! Here is my song!" - With this determination, Uta transforms into the Legendary Protector, Cure Idol! She sings, dances, and gives fan service, making it sparkle no matter how pitch-black it is!