"Where am I?" When "Cure Sky" Sora awakens, she finds herself in an unbelievable world, seemingly separated from Mashiro and the others... Just as she comes under attack, two Pretty Cures suddenly appear. The three of them repel the unknown enemy together, and Sora thus meets "Cure Prism" Yui and "Cure Summer" Manatsu, and even encounters Prim, who can transform into "Cure Supreme"! Meanwhile, "Cure Prism" Mashiro, lost on a small island, encounters "Cure La Mer" Laura, "Cure Finale" Amane, and "Cure Grace" Nagisa, and together they save Puka from a monster attack. At the same time, "Cure Wing" Tsubasa, "Cure Ange" Saaya, "Cure Felice" Kotoha, and "Cure Flora" Haruka meet and take a stroll through the aerial garden together! "Cure Butterfly" Ageha encounters "Cure Earth" Asumi, "Cure Milky" Lala, and "Cure Macaron" Emiru. However, Lala and Emiru don't get along, causing quite a bit of trouble! Although they've met many friends, for some reason, everyone's memories are hazy... Moreover, it seems this world is inhabited only by Pretty Cures...? They want to return to their original world!! The clue is a castle in the distance— Alright~! The great adventure aiming for the castle begins now!