Usobaakka's gimmick, that promises are lies you can't keep, directly counters what every PreCure show is actually about: girls making promises to each other and keeping them no matter what. Hana crossing between three different PreCure timelines isn't just a crossover, it's her proving that those promises hold weight across worlds. The movie trusts you already love these girls enough that seeing them save each other hits harder than any new plot twist ever could.
A monster born from broken promises emerges to transform the world into one of lies and deception. When Hana from Hugtto! PreCure witnesses her friends kidnapped and learns that other PreCure teams across generations are also targets, she realizes this threat runs deeper than a simple attack. A childhood memory surfaces: a promise she made to a boy named Clover in a strange world long ago, one she never managed to keep. As the monster's power grows, Hana understands that her forgotten vow may be the key to everything. She reaches out to the magical girls of Maho Girls PreCure! and Kirakira PreCure a la Mode, bridging three eras of heroes who've never fought together before. Each team brings their own strength and experience, but facing an enemy fueled by the weight of unfulfilled promises tests them in ways they've never encountered. Together, they must confront what it means to keep fighting for your ideals even when the world demands you surrender to lies.