

In an alternate reality where Japan was divided in two in 1974, the southern area is under the auspices of the United States, while the Soviet Union controls the northern lands. On the island of Hokkaido, a mysterious tower is built that seems to rise to the very sky, arousing the admiration of three students who dream of flying to it. When a drone falls in their area, Hiroki and Takuya begin to build their own plane, the Bella Ciela, and promise Sayuri to fly to the top of the tower. But before her dreams come true, Sayuri disappears without a trace. Years later, with the war between the north and the south about to break out, the two young men must risk everything to find Sayuri and fulfill their promise.
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