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The first clue: In a red-crowned crane (called crane in the article) reserve in the northeast called "Crane Island", there lives a group of cranes that have lost their wild nature due to long-term domestication. One autumn, a group of wild cranes from the northern grasslands came here, bringing strange experiences of the outside world. The inner nature of the cranes on Crane Island was gradually awakened, and they also longed to fly freely in the vast sky. However, they have become accustomed to the comfortable life in the reserve, and it is difficult for them to make up their minds. They are very hesitant and ultimately failed to fly south with the wild cranes. In spring, the returning wild crane visited Crane Island again and summoned the young crane (Crane Girl) to fly together. The crane girl was moved and began to practice flying hard. What she had to challenge was not only her own ability, but also the incomprehension from her father.