Mana Aida, a middle school student admired for her passionate and kind nature, embarks on a school trip with her friends Rikka Hishikawa and Alice Yotsuba. However, their outing takes a fantastical turn when villains from the 'Trump Kingdom' unleash chaos by materializing monstrous embodiments of people's selfish desires. Amidst the chaos, Mana crosses paths with 'Cure Sword,' a mysterious warrior of the Precure. Empowered by the revelation that she too can transform, Mana adopts the mantle of 'Cure Heart' to stand alongside Cure Sword in battle. Joined by her friends Rikka and Alice, who become 'Cure Diamond' and 'Cure Rosetta' respectively, the trio fights to defend the world's love from the encroaching darkness of the Trump Kingdom.