Rihito Sajo, an honor student with a perfect score on the entrance exam and Hikaru Kusakabe, in a band and popular among girls, would have never crossed paths. Until one day they started talking at the practice for their school’s upcoming chorus festival. After school, the two meet regularly, as Hikaru helps Rihito to improve his singing skills. While they listen to each other’s voice and harmonize, their hearts start to beat together.

6th January 1975, in an infant nursery in Palermo (Italy), for a mysterious reason, a male nurse exchanges the labels of baby number 7 and 8. Thirty-one years later Tommaso (7) and Daniele (8) meet each other by accident.

Elsa, Anna, Kristoff and Olaf head far into the forest to learn the truth about an ancient mystery of their kingdom.