On a day like any other, Suzuko meets one of her neighbor's children, Shu, in a park on her way back from school and decides to walk home with him. Tragically, they never make it home. Suzuko and the young boy are caught in a giant gas explosion, though instead of dying instantly, Suzuko wakes up in the middle of a battlefield full of corpses in the Sengoku period. A group of marauding bandits attacks Suzuko, but Shukumaru—a boy who had come to loot the corpses to feed his starving village—saves her. Though they both return to the village, Suzuko refuses to give up searching for Shu and returns to the battlefield every day with Shukumaru trailing behind. Though Shukumaru lacks anything resembling modern manners, she gradually finds herself drawn towards him. Just what fate awaits this young girl in this bloody period in Japan's history?

Gunma Akagi, a teenager from the countryside, frequently causes a ruckus with his turbocharged tractor, much to the chagrin of his father, aspiring politician Souichirou Akagi, who urges the family to set a good example to ensure his success. One night, while Gunma is driving his tractor on the highway with his best friend Tamotsu Oishi, the two are suddenly overtaken by a speeding car. Gunma interprets this as a challenge and tries to outpace his opponent, only to fail in a spectacular fashion. The defeat sparks a fire within him, and Gunma becomes determined to win against this mysterious foe at all costs. Soon after, he leaves the peaceful countryside behind and moves to the bustling city, aiming to become the next Formula One star! [Written by MAL Rewrite]

In 2029, a large scale ground sinkage occurred in the Mediterranean Sea. Chemical elements such as oxygen, carbon, gold, molybdenum, and cobalt disappeared from the earth's crust suddenly. The human population was decreased by 90% in sixty years. Researchers found out that the disappeared elements were drained into a planet "Nega Earth", located in another dimension. To save the Earth, a special team called the "Element Hunters" is organized. All of the members are under 13 years old, because young and flexible brains are needed to access "Nega Earth".

Middle schooler Mana Aida is known for her vivid passion and kind-hearted disposition, especially by her friends Rikka Hishikawa and Alice Yotsuba. While the girls are on a school field trip, otherworldly villains from the "Trump Kingdom" appear and create giant monsters from the civilians' selfish desires to cause havoc. In the midst of finding a way to stop the destruction, Mana encounters "Cure Sword," a mysterious Precure warrior. As Cure Sword engages in combat with the monsters, Mana meets Cure Sword's fairy allies, who tell her that she also has the ability to transform into a warrior herself. When Trump Kingdom's invaders begin to outnumber Cure Sword, Mana takes to the battleground with resolve. She partners with Sharuru, one of the fairies, and transforms into "Cure Heart"—the Precure of Love. In her attempts to ally with Cure Sword, Mana ends up pulling Rikka and Alice into the fray, whom each partner with a fairy ally to transform into "Cure Diamond" and "Cure Rosetta," respectively. Together, they battle against the Trump Kingdom invaders to protect the love in the world from being destroyed. [Written by MAL Rewrite]