Musa and Riven are best friends since they were babies. They have sworn to stay together forever. One day, Musa moves away with her father to Melody. From this day on, Musa and Riven go separate ways. But what happens if Musa comes back to Magix 7 years later? How will the reunion of Musa and Riven go? Is there more than just friendship or not? Musa meet the Winx and Specialists, as well a new student from Red Fountain, which is very well known to her. But who could be that mysterious person? And what are the Trix up to? Figure it out.