It seems that Lain's story is not complicated at all. It is about the discussion of reality and virtual reality in the Internet after the Internet is highly developed. In fact, whether it is real or virtual has become an important topic. The popularity can show that virtual existence is affecting real existence. From the perspective of making Lain before 2000, it has a certain forward-looking significance.
But when the film came out, it was really complicated enough, alas.
So, I created an explanation about Lain myself:
Lain was originally an autonomous consciousness awakened on the Internet (similar to an engineer or Smith in The Matrix). The powerful Lain has the ability to modify the real world at will, and then Lain entered the human world by chance. Because he no longer has access to the Internet, his ability It was also closed. Yingli Zhengmei discovered about Lain after entering the online world. He needed Lain's ability to help him realize the evolution of human beings to the Internet. However, since Lain in reality does not have access to the Internet, he can only exert influence indirectly. Modified the Iwakura family including Lain's memory, making Lain the daughter of the Iwakura family, and actually making them a tool to monitor Lain on his behalf, and gradually introduce the real Lain into the online world. After Lain in the real world came into contact with the Internet, Yingli Zhengmei fabricated false memories about another Lain to confuse Lain, making him give up his physical existence and return to the online world to become his own believer. As for why it takes so much trouble, it is estimated that Yingli Zhengmei has no way to directly affect the existence of the real world, but can only exert influence mentally. In the end, his wishful thinking failed. Although Lain returned to the online world, he affirmed the existence of the real world and eliminated Yingli Zhengmei.
For the time being, I think my explanation is not bad, huh, yes, I also need to explain an assumption that although Yingli Zhengmei can change the memory and behavior of people in the real world like modifying the program, it cannot complete the running result of the prefabricated program, otherwise If he can predict everything, then Ellis will have no chance to help Lain realize the meaning of reality.
I don't plan to watch this film for the time being, it's too laborious, I hope to discuss it with my friends~
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