"Fresh Precure! Omocha no Kuni wa Himitsu ga Ippai!?" is a movie spin-off of the "Fresh Pretty Cure!" anime series, which is part of the larger "Pretty Cure" franchise. The story revolves around the main protagonists—Love Momozono, Miki Aono, and Inori Yamabuki—who are also known as Cure Peach, Cure Berry, and Cure Pine, respectively. The narrative begins when the trio, along with their mascot companion Chiffon, are transported to the Toy Kingdom, a magical world inhabited by sentient toys. This world is under threat from the Nakewameke, a group of mischievous creatures causing chaos and disrupting the harmony of the Toy Kingdom.

The central conflict arises when the Nakewameke, led by the enigmatic Toy King, begin to turn the inhabitants of the Toy Kingdom into lifeless, inanimate objects. The Toy King, who was once a benevolent ruler, has become corrupted by loneliness and a desire for control. His actions threaten to destroy the balance between the Toy Kingdom and the human world. Love, Miki, and Inori must navigate this whimsical yet perilous world, using their Pretty Cure powers to restore peace and free the Toy Kingdom from the Nakewameke's influence.

Throughout their journey, the trio encounters various toy characters, including a brave toy soldier and a kind-hearted doll, who assist them in their mission. The story emphasizes themes of friendship, courage, and the importance of understanding others' feelings. As the Pretty Cure team battles the Nakewameke and confronts the Toy King, they uncover the root of his loneliness and work to heal his heart, ultimately restoring harmony to both the Toy Kingdom and their own world. The narrative concludes with the Toy Kingdom returning to its former state of joy and the protagonists reaffirming their commitment to protecting the bonds between all beings.