The Precure's small friends have all turned into PetitCure! 
It has turned into a huge gathering in the “Mysterious Amusement Park” where anything may come true, and they're all having fun in their own way.
 
They eat sweets, play on the rides, and have a whole ton of fun! 
But something mysterious is happening?
 
Their Precure companions are all in good-night mode... so they can have all the fun they want! 
You will surely feel "cured" by the sight of these PetitCure forms! 
Look forward to fun stories every week ♡
 
(Source: Official Website, translated, edited)

PetitCure: Precure Fairies