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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.

"Against all odds, a promise will be kept."

Credits

Hidetaka YoshiokaHiroki Fujisawa (voice)

Masato HagiwaraTakuya Shirakawa (voice)

Yuuka NanriSayuri Sawatari (voice)

Unsho IshizukaOkabe (voice)

Kazuhiko InoueTomizawa (voice)