Girls everywhere are dressing up and acting as their favorite Cures. Only Sakagami Ayumi, the new transfer student, is alone by herself. On her way home from school, Ayumi encounters a strange creature. After naming it Fu-Chan, Ayumi and the creature soon become good friends. However, Fu-Chan is actually a piece of Fusion, and holds the power of darkness. In an effort to make Ayumi happy, Fu-chan swallows up everything that Ayumi dislikes, creating chaos in school and throughout the city! To help bring across Ayumi's true feelings to Fu-Chan, all 28 Pretty Cures gather once more. When everyone's power comes together, a miraculous light starts to shine.