"You and Idol Precure♪" will appear at the "No.1 Universe" Idol Festival! What is the secret hidden on the mysterious island...? One day, Uta and her friends are invited by the coral fairy, Totto to appear in the "Super Miracle Idol Festival" held on a mysterious island called AiAi Island! In a hu~ge venue, many different idols, including robots and animals, gather♪ The biggest idol festival in the universe is about to begin! Or so they thought...? Suddenly, a mysterious monster appears, and AiAi Island and the world are caught up in a crisis... And what's more, they've been transported back in time!? The clue to saving them from this crisis is hidden in the legend of the island's goddess and the mysterious idol-hating girl Tera, whom they met on the island...? That's not all! "Wonderful Precure!" and "Soaring Sky! Precure" will also be rushing over to AiAi Island! C'mon! Sing, dance, and please the crowd - a kirakiLive concert is about to begin!☆