The Trump Kingdom is a magical world where everyone's hearts live happily with the guidance of their ruler Princess Marie Ange. However one day, a evil force known as the Jikochuu attacked the Kingdom. But a warrior who served Marie Ange, known as Cure Sword, fended the Jikochuu by herself before being sent the human world with her fairy partner to find the missing princess. The Cure Sword also brought with her three other fairies who are to find three chosen girls to be her allies. One of the fairies, Charles, finds a girl named Mana Aida who is her school's student council president. Whilst visiting the Clover Tower's observatory during her school's orientation day, Mana encounters a Jikochuu who attempts to manipulate her heart but being found by Charles as he gives her the power to become Cure Heart. Joined by Cure Diamond, Cure Rosetta and Cure Sword, the Dokidoki PreCure must fight to protect everyone's hearts from the Jikochuu.

Chocolat and Vanilla are little witches. They are good friends as well as rivals for the next queen candidate. To decide who is eligible for the next queen, they came to human world. They compete with each other by collecting hearts of men. Which of the two will become the queen?

The story revolves around Koyomi Morishita, a clumsy high school freshman girl who is often mistaken for a grade-schooler because of her shortness. Koyomi becomes a disciple of Misa Anehara, a 25-year-old graduate student who happens to be one of the most powerful modern-day magicians.

:As the mermaid princess of the North Pacific (one of the seven mermaid kingdoms), Luchia entrusts a magical pearl to a boy who falls overboard a ship one night. Luchia must travel to the human world to reclaim her pearl and protect the mermaid kingdoms. Using the power of music Luchia is able to protect herself and the mermaid kingdoms from a growing evil force.