I sorted it out. The starting point should be in 2008, when Jiro ate longevity noodles for his birthday in the store. Here he was hit by a random shot. After winning the grand prize, I used all my energy to build a robot. So what about the prototype of this robot? He is a future man who appeared in 2007.
Putting aside the future people first, since he built this robot and brought her back to the past, this world has a new future since 2008. That is to say, history forked here, and a second world emerged. In this world, robots "died" in the Great Tokyo Earthquake to save Jiro. So, the surviving Jiro spent his life to restore the robot. A few years later, the robot was auctioned off to a girl who looked exactly like the robot. She received the robot's memory and developed curiosity and some inexplicable emotions about Jiro. So she decided to go to see Jiro in 2007. So, the girls from the second branch world went to the first world before the branch. And met Jiro. This is the origin of the mysterious woman whom Jiro will never forget, and the prototype of the robot.
Then, the girl was not reconciled, "I have not yet given birth to you, but I am old when I gave birth to you. At the same time, I will be with you every day." So she went to be with Jiro after the earthquake in Tokyo. Thus, history branches here for the second time, producing the third world, and they live happily in the third world.
We summarize here:
In the first world: Jiro was paralyzed by hemiplegia, and then spent his life building an ideal robot. He sent the robot back to the past (possibly sending her back after he died.)
In the second world, Jiro, after the Great Tokyo Earthquake, began his life to restore the robot, and finally succeeded, but the happiness lasted a few days. God, because human lifespan is limited.
In the third world: two people live happily and happily. (It's just that I don't know, what do they do with that mutilated robot? Bury her? Then there won't be a second world where the restored robot meets a real female buyer, goes back in time, and goes back to the Tokyo earthquake. So this first The three worlds no longer exist.)
So, it can also be done like this: the two repair the robot together (girls are from the future, after all, it is not impossible to bring advanced technology to shorten the repair time). And send it to the second world, so that Jiro, who is fighting alone, has more time with the robot. In this way, the fourth possibility arises, and the fourth world emerges as the times require. By analogy, countless possibilities can be generated.
We will find that starting from 2008, various possibilities will be generated in rays, but they always develop in rays and cannot form a circle. Regret.
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