The movie transports the Precure into a world inside a picture book, where they are guided by Nico, a mysterious inhabitant of the picture book world.

Thousands of years into the future, mankind has colonized other planets across the galaxy and completely forgotten about Earth. On one part of the galaxy, the female space pirates and their colossal starship Sol Bianca get a surprise when a young girl named Mayo stows away on board the ship. The crew then embarks on a journey to Earth to find the whereabouts of Mayo's parents and discover the secrets of the lost planet. (Source: ANN)

To teenager Miyuki Hoshizora, fairy tales are a world of wondrous encounters and happy endings. Inspired by her love for these stories, she lives every day searching for happiness. While running late on her first day of school as a transfer student, Miyuki meets Candy—a mysterious fairy from the world of fairy tales, Märchenland. However, when Candy disappears as quickly as she appeared, Miyuki is left believing the encounter was only a dream. After an eventful first day, Miyuki finds a mysterious library at school. While combing through the bookshelves, she is transported next to Candy, who claims to be searching for the so-called legendary warriors, Precure. When forced to protect Candy's and everyone else's happiness, Miyuki transforms into Cure Happy, one of the Precure warriors! As Cure Happy, Miyuki is now tasked with finding the other legendary warriors and protecting the world from destruction, all while possibly discovering her very own happy ending.

Five female pirates pilot the Sol Bianca, a starship with a higher level of technology than any other known. With it, they seek out riches, such as the Gnosis, an legendary item of power, and pasha, the most valuable mineral in the galaxy. Along the way, they must consider a stowaway's quest to save the one he loves, and seek revenge against those that have wronged them. (Source: ANN)