It is directed by Tetsurō Araki and written by Gen Urobuchi with character designs by Takeshi Obata and music composed by Hiroyuki Sawano.

[3][4][5] A manga adaptation of the film by Erubo Hijihara was serialized in Shōnen Jump+ from April 22 to May 23, 2022.

Various young folk defy the restrictions, and live there anyway, using parkour tournaments as a means to barter and trade supplies.

One day, Hibiki attempts to climb the tower because he hears a woman's song, and believes he sees a boy there.

In the final scene they save each other, but Uta fades into bubbles as in the original fairy tale from Hans Christian Andersen: "The Little Mermaid."

Whether real or imagined, in the end credits Hibiki is still continuing to do parkour and there is a bubble following him which could imply it is Uta.