“…… Because time has no continuity, even if I change history in this era, it will not affect the future, everything will end in this plane of time.

- Even if you replace a few extra words in hundreds of still images, it won't have any effect on the story as a whole, right? ”

"That's not right! What doesn't affect is the future of your original world, which has been changed for sure! And it's all changed! ”

At the end of the conversation, Shi Jiuru somehow came to a conclusion that could not be more wrong on that correct theory of time and space, and was pointed out by Ji Feng to the point.

Perhaps, the surprised Shi Jiu Ru herself didn't understand the theories she had just told Ji Feng, what she just said was just the "superior" - that is, the original words that her self told her when she grew up.

And when she grows up, she ...... To be honest, she doesn't look like a big scientist who can study the theory of time and space, and she's probably just using future book knowledge to fool her past self.

However, Ji Feng is different, he is a lover of science, and he has no problem understanding such an easy-to-understand "popular science" knowledge. Although he didn't know exactly what it took to make accurate space-time movements, he already knew exactly what space-time movement was all about.

"Time and space are discontinuous outside the box, but they are continuous inside the box. Using cartoons as a metaphor, each picture is a complete, continuous, and inseparable two-dimensional world. When you enter this two-dimensional world, all your actions, even your very existence itself, have a real impact on the world.

Your mistake is to think that the past, present, and future in three-dimensional space are really one axis, but in fact, in three-dimensional space, 'time' is just a concept, not a certain dimension that objectively exists, so you can't separate this concept from non-objective existence. ”

"Huh? Huh? What, what? ”

Ji Feng just explained her fallacy to Shi Jiuru simply and clearly, which had already made Shi Jiuru show extremely blank eyes, it seems that the reason why she was able to talk eloquently just now was really just being fooled by her future self.

But think about it, even if Shijiuru comes from the future, even if she has some future scientific knowledge in her head, it can't hide the objective fact that she herself is not smart enough. This shortcoming of hers can be compensated for with life experience in the future, but now she's just a clumsy girl, and her actual age may not be 16 years old - if the adult version of the real Jiuru is really a lot taller than the current real Jiuru like in the anime.

For such a real Ruru, Ji Feng really can't ask her to understand what she is talking about.

"To put it simply, you're wrong."

"Huh? Wrong, wrong? What's wrong? ”

"I've told you very clearly what is wrong just now, and if you can't understand it, then I can't do anything about it."

After confirming once again that Shi Jiu Ru did not understand just now, Ji Feng couldn't help but look up to the sky and sighed, and then completely gave up the scientific communication with Shi Jiu Ru.

Shi Jiuru blinked at him with simple and blank eyes and showed a helpless expression, but she still couldn't understand what Ji Feng said just now, and she didn't understand what the "superior" told her about the theory of time and space, the only thing she knew was that in this case, she had to bow and apologize for her incompetence.

"W-That...... I'm sorry, I'm actually stupid, stupid......"

"Well, I'm pretty clear about that."

Next to Shi Jiuru, who had lowered his head deeply, Ji Feng nodded with deep feeling, and at the same time raised his hand and gently flicked Shi Jiuru's forehead.

"Yikes!"

Shi Jiuru immediately snorted cutely, and then covered her forehead with a blushing face and straightened up, this time Ji Feng omitted all the explanations and directly told her the final "correct answer":

"The world we live in is a separate plane of time in the theory of space-time, so your actions in this world can only affect the future of this world, not the future of the plane of time where the future people are.

But then the question arises, since even if you change a tragedy that has not yet occurred in this plane of time, the tragedy that has happened in the plane of your own inner plane will not be changed, so why do you come to this plane of time that is 'past' for you? What benefits do you want from this time plane?

Are you here for 'archaeology'? Or do you want to conduct some inhumane experiment that is forbidden in your own plane of time? Or do you want to stay in this world and use your advantage as a prophet to become rich and powerful? ”

"Huh...... Can it be changed? I—I seem to understand, but I don't seem to understand.

Anyway, we didn't come here for archaeology or experimentation, we observed a huge time shake three years ago......

……

…… The reason why I approached Suzumiya-san was to monitor whether there were any new time changes around her...... Sorry, I can't find a better adjective, anyway, my job is to track and monitor. ”

Probably afraid that Ji Feng would ask some questions that she couldn't answer again, Shi Jiuru told all the news that the "superiors" wanted her to reveal to Ji Feng in one breath this time.

However, not to mention the principle and effect of the time vibration, Ji Feng has just changed it many times from the "original...... If she says that she is an act of preserving history, she can judge that the surveillance work that Shijiuru is telling him is actually a lie.

The real tracking and monitoring is to stand aside and watch quietly like Yuki, and never take the initiative to exert influence on the monitored. And although the real Jiuru in the "original work" did this in the SOS group, she later made some arrangements in advance to change the future.

- Although she claims to do this to keep the future on "the existing track", if you think about it, the changes made by people in the future cannot affect the future of their own world, so how did this history in their world come about? Could it be that the future people of other time planes secretly made some small moves in the past of their world, and they still knew about it?

However, it will not do him any good to expose this lie, and it will only be deduced by the future people that he also knows the "future", so Ji Feng quietly buried his doubts in his heart. After lowering his eyes and pretending to think for a few minutes, Ji Feng finally asked indifferently:

"Since I'm a futurist, you should already know my true identity, right?

Now you tell me your purpose that you want me to assist you? But isn't your job just to keep track of Kasuga, and you don't need my help at all, right? ”