The tale commences as Hugtto! PreCure's Hana, Saaya, and Homare bring Hagutan to her debut in a flower garden. In a sudden turn of events, a monstrous creature by the name of Usobaakka emerges. Usobaakka seeks to transform the world into one riddled with deceit, and goes on to abduct Saaya and Homare. Upon learning that the girls of Maho Girls PreCure! and Kirakira PreCure a la Mode are also in danger, Hana makes the decision to offer her support. As the battle commences, Hana recollects an unfulfilled promise made with a boy named Clover whom she met in a curious realm during her childhood; this promise, according to Usobaakka, is nothing more than a lie. Hana gradually realizes that this promise is the root of the current situation. Will Hana, with the help of three generations of PreCure girls, manage to defeat the formidable Usobaakka and fulfill her promise with Clover?