After her mother's death many years ago, 17-year-old loner Suzu starts going by the name Belle while she is online, revealing her hidden singing talent and becoming a sensation the world over, soon drawing the attention of a mysterious being called the Dragon.

Mamoru Hosoda is an internationally acclaimed animator and director who has previously helmed such award-winning movies as The Girl Who Leapt Through Time, Summer Wars, Wolf Children, and The Boy and the Beast.