The Fairilus dwell in the bizarre magical realm of Little Fairilu: miniature magical fairies who symbolize flowers, insects, and other creatures and are all born from the Fairilu Seed. Each Fairilu is born with its own key, the Fairilu Key, which allows it to enter magical doors and cast magical spells. The Fairilu can ultimately evolve into a full-fledged fairy if it finds the perfect entrance. The doors also provide access to the human world. Fairilus must study and attend school in order to learn about the world in which they live, while also making new friends and living freely and organically.