The story takes place in 1978 when a 12-year-old boy, David (Joey Kramer Joey Cramer), accidentally falls into a valley and loses consciousness. When David woke up, he came home, only to find that everything in front of him had changed. It turned out that it was 1986, which meant that the 12-year-old David had to face the future world eight years later. What happened during David's coma? David finally found his separated family. His younger brother Jeff (Matt Adler), who was four years younger than him, has now grown into a big boy, while David is still 12 years old. After that, an outer space flying object landed on Earth, and its existence is inextricably linked to the mystery encountered by David. So NASA approached David and asked him to help investigate the matter.
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