[5][a] The season was directed by Takashi Sano, with Hirokazu Hanai as assistant director, Erika Yoshida in series composition, Masashi Kudo and Miho Tanino in character designs.

Season 1 follows 25th Bam, a boy who enters this tower in search of his friend Rachel.

As he ascends, he faces challenges, meets allies, and discovers the tower's mysterious nature.

The anime describes itself in the episodes as the story of the beginning and the end of Rachel, the girl who climbed the tower so she could see the stars, and Bam, the boy who needed nothing but her.

[6] The opening theme song is "Top",[7] while the ending theme song is "Slump"; both are performed by the K-pop band Stray Kids in Japanese, English, and Korean for the respective language dubs.