The Cure Rose Garden has always been concealed from human eye. Flora, the area's guardian, watches over it and ensures that the path to the secret area doesn't appear. However Eternal, an art organization known for amassing treasure and artwork from many worlds, is trying to get to the garden. Flora senses the danger and sends a letter to Nozomi and the Pretty Cure, who regain their ability to transform and fight alongside a new warrior, Milky Rose.