The flames of war explode in the Middle East as two shadow forces unleash monstrous new weapons of mass destruction! But in a world in which giant robots are real, the most dangerous weapon of all lies buried within a human mind. Yuushirou, the fourth son of the mysterious and powerful Gouwa family, finds himself at the center of events that will change the future of mankind forever! Nothing can prepare the human race for what is about to be unleashed in Gasaraki! (Source: Sunrise)

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]