In the chat group at this moment.
[Whisperer: By the way, have you noticed? The sun's angle over there hasn't changed at all.
Fallen Saint Black Cat: Huh? Really? If the sun's angle hasn't changed, what kind of situation is that?
Dr. Kouzuki: There are two possibilities; one is that the Earth has stopped rotating
Seventh Heaven: Stopped rotating? That's a terrifying thing!]
Stopped rotating?
Black Cat, still a middle school student, might not clearly understand what specific consequences this would bring, but she knew it was an extremely serious problem.
It was almost equivalent to an apocalyptic disaster.
[Martian: If the Earth stops rotating, what will happen is...]
The Martian is online!
Of course, they weren't really aliens, but had revealed themselves to be descendants of Earth humans who had migrated to Mars.
And they spoke so clearly about it—could it be that in their world, Earth once faced such consequences, leading to the Mars migration?
[Dr. Kouzuki: Yes, that's very correct, but the situation doesn't appear to be this type, but rather another
Fallen Saint Black Cat: Another? What is it
Dr. Kouzuki: Tidal locking
Martian: Tidal locking]
Both answered simultaneously, but Ruri Gokou still had a completely bewildered look.
Afterward, they explained to her what tidal locking was, just like the tidal locking between Earth and the moon, which causes one side of the moon to always face Earth.
And now, Earth had most likely undergone tidal locking with the sun, causing one Earth rotation to equal one orbit around the sun.
This meant that one side of Earth always faced the sun.
Such a situation would also lead to abnormal climate on Earth.
And it was no wonder that the forest area they were currently in looked somewhat strange, with some plants appearing to have undergone mutations, presumably to adapt to the climate.
As for the existence of fruit trees, it seemed this illuminated area was located at a relatively marginal point, which was why they hadn't been scorched to death by the sunlight.
Of course, it might also be due to the special climate formed here, such as the regular occurrence of overcast skies and rain, resembling night.
This formed day and night changes, making this area just right for the growth of some fruit trees.
However, these weren't the matters that concerned Black Cat the most.
[Fallen Saint Black Cat: This Golden Toilet guy seems to know what A2's world is like
Dr. Kouzuki: Judging by his tone, he obviously knows it very well. It's likely that the [work] related to this world setting in his world is quite complete, and might even have concluded, which is interesting]
Moreover, that guy was also very familiar with Black Cat's world, which made her suspect that he might know more about the worlds of other members in the group.
Right, he was also very familiar with Saeko Busujima's world.
Really, he might know about all of them.
Just as Black Cat was about to tell everyone about this point, the guy in the livestream was about to start narrating how humans in this world went extinct, causing her to stop her message and listen quietly.
The cause, that was the appearance of anomalous white statues and red dragon-like beings in the Far East island nation at the beginning of the 21st century, which humans later dubbed "Giants" and "Dragons."
In the conflict between the two, the Dragons ultimately won.
Then, after the island nation's military killed the weakened Dragon with missiles, the disaster began to unfold.
A virus spread from these two anomalous creatures, becoming the source of destruction for this world.
People infected with this virus would gradually have their skin salt-crystallized, turning white, dying within days or weeks, or undergoing drastic personality changes, becoming extremely cruel.
Therefore, officials dubbed this disease the "White Chlorination Syndrome."
As the virus continued to spread, the war between humans and the red-eyed ones fully erupted.
The red-eyed ones referred to those who, after being infected with this virus, displayed a distinguishing phenomenon—as the name suggests, their eyes turned red.
After continuous research, humans successfully discovered that the virus was a type of particle emitted by those two monsters, dubbed "Maso."
Later, through Maso, humans further discovered the ability to produce what was called 'magic.'
Continuing their research, they even achieved the separation of human souls and bodies, allowing souls to take form, and then be returned to their original bodies.
With deeper research into Maso, they also implemented a plan to modify the human body, achieving human enhancement.
Afterward, they successfully created artificial life forms, similar to replicants or clones.
The purpose of these people was to serve as vessels, providing a means for those infected with "White Chlorination Syndrome" to extend their lives.
These people, like simple robots, would carry out the tasks of the original humans, while humans would temporarily escape from this global disease and enter a state of dormancy.
As for why they entered dormancy rather than continuing to live through replicants, it was obviously due to the risk of re-infection with "White Chlorination Syndrome."
Living in a formed state with the extracted soul wasn't smooth either; it was unstable and easily led to personality collapse, turning into agitated collapsed entities, so the souls could only be put to sleep.
The slumber of souls was achieved through the implementation of a Grimoire Noir plan, becoming a repository for human souls.
Of course, since "White Chlorination Syndrome" could not be contained from spreading, the infection of all humanity was inevitable.
Therefore, humans also carried out the android plan.
The androids here were not replicants; simply put, they were AI robots, used to manage the unconscious replicants.
They were tasked with carrying out extermination missions while also collecting Maso, and then, through a certain ritual, banishing it from this world.
Subsequently, humans continued with plans such as the Grimoire Noir and Grimoire Weiss, and when the time was right—that is, when White Chlorination Syndrome was eliminated—they would activate this plan, allowing human souls to return to their corresponding customized replicants.
But this plan didn't account for one problem: the subsequent development of self-awareness and consciousness in the replicants.
After rapid development, they later became almost indistinguishable from humans.
Subsequently, as time passed and through various events, most replicants didn't know they were replicants and instead considered themselves as legitimate humans.
And as the banishment of Maso was completed, when the original human souls were about to return, the replicants perceived the form-based humans' usurpation as an attack by monsters.
Thus, the war between replicants and original humans began.
At this point, the protagonist appeared—a protagonist named Nier, who was also a replicant.
He was deceived, believing his mission was to save humanity [replicants], but was actually led by the so-called Grimoire Weiss to implement a plan allowing the souls of original humans to return to the replicants, which would, of course, eliminate the originally born consciousness and soul of the replicant.
The result of the story was that Nier defeated the great demon lord, successfully preventing humanity [replicants] from being eliminated.
Interestingly, the great demon lord was the original human body of Nier; he hadn't entered dormancy because he could maintain clear consciousness without collapsing after taking form, so he made a deal with the organization at that time.
The organization at that time had this Nier [Shadowlord] help provide a small amount of Maso for other formed sleeping souls, otherwise they couldn't maintain themselves.
So, this Shadowlord lived lonely for over a thousand years, providing Maso for the original humans.
And the condition he agreed to was, of course, that the organization would resurrect and give him a healthy sister.
After all, wanting to have one's soul extracted for formation and future resurrection wasn't something ordinary people could participate in; it was a privilege of the upper class.
There simply weren't enough financial resources to provide this for all of humanity.
So, Nier [replicant] finally successfully defeated Nier [Shadowlord], and the original humans became history.
Of course, Nier [replicant] wasn't primarily motivated by some grand cause, but mainly to protect his sister [replicant].
And the sisters of both were related to each other in the same way as the two of them.
And the artificial life forms, unable to reproduce, eventually went extinct.
With this, humans completely exited the stage of history.
So, hearing all this, Black Cat finally couldn't contain her excitement.
[Fallen Saint Black Cat: Isn't this the story from the second generation of the "NieR series" that I played?!!!]
This was the reason for Ruri Gokou's excitement.