After the war, Japan was divided into two parts, North and South. In Aomori Prefecture, which was ruled by the US military, the teenagers Hiroki Fujisawa and Takuya Shirakawa both liked their classmate Sayuri Sawado. They both had Sayuri in their hearts, and that thing - the "tower" built by the Hokkaido Alliance of Japan in the Tsugaru Strait north of the border. The huge and mysterious tower was the dream of the three boys and girls. They agreed to build a small plane and fly to the tower to find out. Sayuri transferred to Tokyo in the third year of junior high school. The two boys gave up the idea of making airplanes. Hiroki was admitted to a high school in Tokyo, and Takuya continued to study in a high school in Aomori, and they went further and further on their own paths. However, many years later, Sayuri fell into a deep sleep in the hospital! This sudden illness brought the three together again. The sleeping illness has a mysterious connection with the power of the tower, and the tower itself seems to have become a base for the war between North and South Japan. The three people involved in war and love, will they save Sayuri or save the world! The answer to fate seemed to be at the other end of the clouds, the place where they had agreed to meet.