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There is a planet named HD2808 in the distant outer space. Its environment is close to that of the earth, and it has a civilization far higher than the earth. There are countless lives on it, including of course life forms that are close to humans on earth. On this planet, there is a girl named "Leah", who is about 20 years old, a kindergarten teacher, and has an extremely rare blood type. She saved many children in the class due to the earthquake, but when she was saving a little girl in the class, aftershocks came. She was injured by a building because she was protecting the little girl. She could not find a suitable blood type transfusion and was about to die. The medical level of this planet can only support Leah to survive for 3 months. If a suitable blood type cannot be found, Leah will die. So, Leah's family spread the story to various parts of the planet through the Internet. The leadership on the planet was extremely moved when they heard about it, and sent people to drive a super-fast light spacecraft to search for people with suitable blood types on the earth. Finally, they found a boy named "Starlight" on the earth. He started a romantic and interstellar love journey, but later he encountered opposition not only from his family, but also from the entire human race on the earth, because they opposed being with alien races, otherwise it might bring crisis to the earth. However, Starlight still ignored it and firmly chose to be with Leah, so he chose to leave the earth forever and live with Leah on this strange planet for a long time...