For teenager Miyuki Hoshizora, fairy tales are a realm of wondrous encounters and happy endings. Inspired by her love for these stories, she spends 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 fairy-tale world of Märchenland. However, when Candy vanishes as quickly as she appeared, Miyuki is left believing the encounter was merely a dream. After an eventful first day, Miyuki discovers a mysterious library at school. While searching through the bookshelves, she is transported to Candy's side, who claims to be searching for the so-called legendary warriors, the Precure. When forced to protect Candy's happiness and that of everyone else, 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.