Spirit Particle Imaginary Trap
Cursed Cutting Crater (Spirit Particle Imaginary Trap)
The official name of this stage.
The fact that BB had reached the Moon Cell core established this “place”, formerly imaginary space for storing malicious information, as real space in the present, past, and future. It was reconstructed at her hands as a “far side of the moon” where even Masters can exist.
BB attaining the power of the primordial goddess succeeded in quantifying the “nothingness” before the birth of life. She transformed into a master of imaginary space where time and space are indefinite.
While the Moon Cell can’t be hacked however much time is spent, BB was able to take control of it by placing herself in “unlimited time”.

02 The remnants of peaceful days
After the constraints to her free will were removed by Kiara, she was unable to control her status abnormality and went into overload.
As NPCs can only do routine work, they ignored Sakura while she was crashing down as being “non-existent”, and since the mooncell only performs a check at the end of the day in the preliminaries, Sakura was within an inch of termination.
(MC name) witnessing this called to her. Are you okay, he/she said.
The observation of Sakura “being here” by a third party helped her recover her close to disappearing unconscious, and the subsequent nursing gave her a clear ego of “wanting to be here”. Her self-destruction was averted.
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What happened afterwards need not be said.
When the next day comes, everything will be erased by the mooncell. Sakura wanting to continue this one day miracle used her higher class AI privilege to repeat the day she came to know the MC for 69 days.
However as time passed, Sakura came to suffer from her self-contradiction as an AI and from the fact that she dragged (MC name) into this.
“The Masters participating in the holy grail war will all die, barring one exception. No, even then (MC name)…..”
Sakura continued to suffer from her desire to continue the loop for eternity and her feelings for (MC name)
The decision she chose ultimately was to seal the 69 days worth of memory, the love she acquired, so she could return to being a normal AI.
An AI cannot delete records.
Because of that, she moved the memory to a backup machine to reset herself.
Believing that to be the best choice for (MC name).
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But even if the memories in the mind are lost, the memories recorded by the body continue to live. Though she had forgotten everything and was back to being a normal AI, she was shaken by emotional values of unknown origin every time she talked with the MC.
Meanwhile, the backup to which she moved her memory, couldn’t tolerate herself, and she decided her course of action and made her move as BB, the rebel plotting to destroy the system of the mooncell for a certain objective.
The timing she took control of the far side of the moon was between the end of the fifth round and the beginning of the sixth in real time. Four Masters who were not defeated yet, (MC name), Leo, Rin, and Rani, and the irregular exception Jinako were kidnapped to the far side during the war while they were still alive.
Matou Shinji, Gato, Julius were moved to imaginary space 0.00001 seconds before the firewall would have destroyed them after they were defeated, prolonging their flash of life.
Regardless, CCC is a dream by BB.
If the dreamer is no more, the world ought to return to a reality where nothing happened.
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By the way, the everyday scenery in the prologue that (MC name) saw in his nightmare was an artificial paradise modeled off the discarded 69 days.
After pulling (MC name) to the near side, BB placed his digital body in the old school building, putting into a deep sleep and sealing him in a never ending dream.
Normally, he would have lived peacefully in the looping everyday life, but the strength of his bond with his Servant, or his own will rejecting the peaceful days caused cracks in the artificial garden and (MC name) came to notice something was not right.
In order to place (MC name) into deep slumber once more, BB reset the school building and tried to redo the dream, but the (MC name) escaped the reset and leaped into a deeper part of imaginary space
It was a depth deeper than the bottom of Id.
“The death of the collective unconscious” beneath the unconscious.
What saved (MC name) who leaped into a region even BB cannot affect was the voice of the Servant whose fate was shared with his.
Thus, the contract was sealed, and (MC name) woke up in the old school building left in the far side.