Lumi is an apprentice who dreams of becoming a perfumer, until black mist attacks her on her way home. A black cat that claims to be a messenger of the Flower Star guides her as she awakens the power of an antique flower key her ancestors left behind, and she transforms into a Flower Fairy. Dark magic has made the Seven-Colored Flower wither, and its seven petals are now scattered across Flower City, where they cause strange phenomena that wear away at people's minds. As a descendant of the Flower Fairy bloodline, Lumi takes on the mission of purifying and gathering the seven petals to keep Flower City safe, using floral magic to drive away the darkness in people's hearts. Her journey as a magical girl is also a story of growth. Partway through this adventure, she comes under attack from another mysterious Flower Fairy. The series runs for 26 episodes.