A great Pretty Cure gathering! Or so we thought. They've actually been separated~!? "Where am I...?" --When Sora wakes up, she finds herself in a mysterious world... It seems that she has lost Mashiro and the others.... But there she meets Yui, Manatsu, and Prim! What's more, Prim transforms into Cure Supreme! Mashiro meets Laura, Amane, and Nodoka on a small island in the sea, and rescues Puka from a monster attack! Tsubasa meets Saaya, Ha-chan, and Haruka, where they take a walk in the hanging garden! Ageha meets Asumi, Lala and Yukari, but Lala and Yukari are having trouble getting along! They meet a lot of friends, but for some reason, their memories are all a little hazy... And it seems that the only people in this world are Precure...? We want to go back to our own world! The clue is a castle in the distance-- Onward! Our journey begins here! Let's go on a great adventure to the castle!