The Place Promised in Our Early Days

In a post-war Japan divided into the North, controlled by the Union, and the South, controlled by the United States, three high school students promise to cross the border with a self-built airplane and unravel the secret of a mysterious tower. The story follows Hiroki Fujisawa (Hidetaka Yoshioka) and Takuya Shirakawa (Masato Hagiwara), two childhood friends who grow apart after one of their friends, Sayuri Sawatari (Yuuka Nanri), mysteriously disappears. Years later, they cross paths again as the tower's power grows, replacing matter around it with matter from other universes.