Ordinary fourth-grade schoolgirl Sasami Kawai's life takes a dramatic change of direction when she meets Tsunami, the newly-appointed queen of the magical kingdom of Juraihelm, who appoints her as a representative of good on Earth. Sasami becomes the magical girl Pretty Sammy. However, Ramia, rival for the crown of Juraihelm, plans to scupper Tsunami's bid for leadership by pitting Sammy against her own creation, Pixy Misa.