Takahiro Hirano

Kohei Takahara, an astronaut who dies in the line of duty, is legally resurrected as a clone: however, contrary to the scientists’ expectations, he reverts to his childhood memories when his twin brother drowned sacrificing his life for Kohei. Kohei’s clone discovers the body of his former self mistakenly believing that it is his deceased twin. Reliving his tragic past, he sets off carrying his corpse body to the beautiful hometown where he lived with his now dead mother.

Three moments in Takaki's life: his relationship with Akari and their forced separation; his friendship with Kanae, who is secretly in love with him; the demands and disappointments of adulthood, an unhappy life in a cold city.

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.