The fairy mascots from throughout the Precure franchise have been transformed into chibi-like forms known as PetitCure, gathering at a mysterious amusement park where anything can happen. This park serves as the central setting for their gentle adventures, where they eat sweets, play on rides, and enjoy each others company in their own unique ways, though subtle mysterious events occasionally unfold around them.

The cast is composed of various fairies from different Precure generations. Mofurun, a gentle being who loves sweet scents, acts as a connective presence among the group. Porun is a somewhat spoiled prince of light who may show his determined side when it counts. Other participants include the energetic puppy Komugi, the calm and independent cat Yuki, the laid-back Kururun, the innocent and food-loving Fuwa, the joyful prince Coco, the cool-headed prince Nuts, the kind but tsundere Syrup, the earnest Tsubasa, the elegant Puff, and the cheerful but clumsy Hummy. The second season adds another group, including the godlike Niko, fashion-loving Candy, the rice spirit Kome-Kome, the maid-in-training Milk, the calm Daifuku, and the affectionate pairs Mepple and Mipple, among others. Each fairy is associated with a favorite food or treat.

The narrative unfolds across extremely short episodes, typically ranging from half a minute to a minute and a half, with no spoken dialogue. The first season focuses on the fairies interactions at the amusement park. At the conclusion of the first season, Mofurun and Porun are transported away from the park, arriving in a new paradise made entirely of sweets. This confectionery world becomes the primary setting for the second season, where new fairy companions join the two travelers. The series presents a lighthearted, slice-of-life experience emphasizing the cute and relaxing moments of these beloved characters playing and exploring together.