A lonely kid finds something lost and broken in the dark, names it, loves it anyway. By the time you realize what Fu-Chan actually is, the movie has already made you complicit in her choice. Every Cure who ever fought in the name of friendship gets called to answer what that promise actually costs when the person holding it isn't trying to hurt anyone, she's just trying to belong.
Yokohama's Minato Mirai district buzzes with Pretty Cure fever after news of Fusion's defeat spreads through the city. Girls everywhere celebrate their favorite magical warriors, but transfer student Ayumi stands apart from the excitement, isolated and searching for genuine connection. Everything changes when Ayumi discovers a small, endearing creature and names it Fu-Chan. The two bond instantly, and for the first time, Ayumi feels truly understood. Yet Fu-Chan harbors a dangerous secret: it's a fragment of the defeated Fusion, carrying immense dark power. Desperate to grant Ayumi's happiness, Fu-Chan begins consuming everything she dislikes, transforming her world into something unrecognizable. What started as friendship spirals into chaos threatening the entire city. Recognizing a crisis only they can handle, twenty-eight Pretty Cures unite across all their generations to intervene. They understand the real battle isn't against Fu-Chan itself, but reaching Ayumi's heart and helping her communicate her true feelings to her impossible friend. When the Cures combine their collective strength, something miraculous emerges that might save both the girl and her strange companion.