A spring carnival where 40 Pretty Cure warriors converge is pure franchise fan service, and the movie knows exactly what it is. The animation jumps several notches above the TV show, especially in the dance sequences where CGI actually serves the spectacle instead of undermining it. The plot is basically a mascot heist wrapped around an excuse to watch every iteration of the franchise move together in one space. What matters here is not the story about guardian dragons or suspicious announcers. What matters is seeing Cure Moonlight stand next to Cure Heart, all of them moving through a world that feels alive in a way the weekly show rarely achieves.

Harmonia, a land devoted to dance and song, is opening its spring carnival. Haruka and her friends join the festivities hoping to learn dance and song from the senior Pretty Cure who came before them, but the celebration quickly turns to confusion. The fairies disappear, and the carnival's announcers, Odoren and Utaen, start to look very suspicious. Worse still, Harmonia's guardian dragon goes on a rampage, enraged by the disorder at the festival. To protect the peace of Harmonia, forty Pretty Cure warriors join forces, hoping to bring about a miracle through hopeful song and dance. A musical fantasy film in the magical girl tradition, it gathers generations of Cures into one team.