![Arendelle Castle Yule Log](https://i0.wp.com/3amovies.com/wp-content/uploads/2024/03/raeIyLc6HzQ7XrwtiFuKcoHkANJ.jpg?resize=185%2C278&ssl=1)
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.