Against all odds, a promise will be kept.
In a post-war alternative timeline, Japan is divided into the North, controlled by the Union, and the South, controlled by the United States. A mysterious high tower rises within the borders of the Union. Three high school students promise to cross the border with a self-built airplane and unravel the secret of the tower.
Hidetaka Yoshioka
Hiroki Fujisawa (voice)
Masato Hagiwara
Takuya Shirakawa (voice)
Yuuka Nanri
Sayuri Sawatari (voice)
Unsho Ishizuka
Okabe (voice)
Kazuhiko Inoue
Tomizawa (voice)
Risa Mizuno
Maki Kasahara (voice)
Hidenobu Kiuchi
Arisaka (voice)
Masami Iwasaki
Emishi Seisakujo Koin / Eki Shanai Announce / Byoin Incho (voice)
Eiji Takemoto
Emishi Seisakujo Koin / TV News (voice)
Takahiro Hirano
Emishi Seisakujo Koin / Daigakuinsei (voice)
Takeshi Maeda
Daigakuinsei / Radio Hoso (voice)
Yûki Nakao
Joshi Seito (voice)
