Set in 2004, Binzume Yousei is a slice-of-life fairy tale centered on four fairies, each associated with a distinct color visible in their magical bottle jars. The group includes the highly energetic Kururu, the reserved and feminine Chiriri, the tomboyish Sarara who loves samurai, and the quiet but eccentric Hororo. Drawn by fascination with the human world, these fairies came from the fairy realm hoping to take part in annual traditions and the general lifestyle of humans. However, their grasp of the human world is very limited. Fortunately, they befriend and are guided by two humans: "Sensei-san," a university student with whom they reside, and a first-grade girl they call "Tama-chan," who can be just as naive as the fairies themselves. Although these bottle fairies hold strange notions and occasionally struggle to comprehend this new environment, they attempt to maximize their human experience in their own endearing ways.