Because the TV version is different from the game, the reason for the first kiss is not mentioned, so it makes sense to say that the first kiss is an assistant in the theater version, and it is not crossing the world line/crossing time/changing the past /Reorganized the future, because he didn't know the ability of fate detection before being discovered by Yuzhen, which means that he had not become an observer of the world when he was a child (which is why Yuzhen must exist on the SG line before 2011 ), but ordinary people will more or less have a sense of sight of memories of other world lines. That is to say, although Xiuzhen did not subjectively go to the SG line when he was a child, his childhood memories on the SG line are likely to resemble Du Dulu leaves all kinds of sense of sight of death. This is why the assistant can save Yuzhen in the end. It is because after this first kiss happened, for Yuzhen, the line of SG was confirmed to be "reality". ".
Regarding parallel universes,
in fact, the theater version still does not use parallel universes, but follows the theory of world line convergence. Originally, according to this theory, the final world line is unique, and the future will be reorganized based on the observer’s backtracking, and the observer believes that the real world line is the only and true world line. But the SG line itself is not a normal world line, it is a gap between the world line, and it is very unstable. It can be considered that the TV version of the fierceness and the original theater version of the fierceness did not find the existence of the R line, in fact, ring the bell In the animation that Yu explained, the R line and the SG line are interdependent, and they are the indispensable world lines that are entwined with each other. The R line is needed to offset the instability of the SG line. In other words, in fact, the world line of the "gap" that the TV version of Yuzhen thinks is not the SG line, but the "SG+R" line. Therefore, no matter how it dissociates, it is impossible to dissociate back to the α/β line, only between the SG line and the R line.
Later, there was a situation where Yuzhen finally disappeared on the SG line. According to Suzuyu’s explanation, Yuzhen could not agree that the SG line was "reality", so he actually had no place to go (because there was no D-MAIL and no time. The machine, he is always on the world line where the SG line and the R line are entwined, because the world he observes is the only converge) so he was finally exiled to the R line. It is speculated that the R line as a subsidiary line of the SG line is just a world line that exists to balance the SG line. That is to say, the two lines of the R line and the SG line must be interdependent. There is only a group of "real people on the two lines." ", including ordinary people and observers. That is to say, no matter how far away, it is impossible for two identical people to appear on line R and line SG, that is, when Xiuzhen exists on line SG, there is no one on line R; when Xiuzhen drifts to line R, there is only him on line R. one person. So it is not a parallel universe. So he appeared on the SG line for a while and disappeared but did not affect the SG line's closing at all. The assistant did not change the world line when he went back, and the world did not reorganize, but because Xiuzhen reached the gap between the SG line and the R line, the world's confinement has been determined, so it seems that the last assistant changed the future but in fact The fierce "reality" of the observer can only be controlled by himself on the SG line or the R line.
So the assistant went back and kissed Xiuzhen and created this memory. For Xiuzhen, the reality was confirmed, so he returned to the SG line and thought the assistant was the first kiss.
I think that although in the end everyone has more or less memories of the truth, but in fact, the truth is still the only observer. Including the assistant, because if the assistant becomes an observer in the true sense, the world line is likely to change due to her interference (or the reality of each observer’s "thinking reality" will produce countless worlds, This becomes a parallel universe theory). So I am more inclined, because the deviation between the SG line and the R line is very small and entangled with each other, which makes the assistant and other people's sense of sight become stronger, and even can retain the memory, but the real observer is still only Runtaro Okabe. As long as he does not interfere, the bundle of the SG+R line is always certain and unique.
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