In the story of tsukihime, Arcueid was tricked by Roa into drinking his blood, while she also shared her own blood with him, which triggered the main plot of tsukihime.
That was a world where gaia was stronger than alaya. Akatsuki was not clear on how the strength of the counter force was divided; she only knew that the time for those True Ancestors hiding in the Millennium Castle had come.
In the story of tsukihime, the day after Arcueid was tricked by Roa, she could no longer suppress her Bloodlust Impulse and slaughtered all the True Ancestors in the Millennium Castle. Afterward, she sealed herself within the Millennium Castle, awakening only to leave and kill Roa's reincarnations whenever he was reborn.
Feeling the most primal impulse within her body, Arcueid's eyes suddenly widened. She tried to push Akatsuki away, but at this moment, Akatsuki seemed to have grown onto Arcueid's body, remaining motionless no matter how Arcueid attacked.
A large amount of blood was poured into Arcueid's mouth, and at the same time, she felt the blood in her own body rapidly draining away. This was a contest of mental strength between True Ancestor Royalty. The sanity in Akatsuki and Arcueid's eyes gradually vanished, replaced by an endless bloodlust.
As time passed, the faces of both became increasingly pale. The True Ancestors within the Millennium Castle were suddenly jolted awake. Terrified, they rushed toward the two True Ancestors in the sea of flowers, wanting to separate Akatsuki and Arcueid.
However, with Arcueid as the center, a massive amount of magical energy instantly erupted. Having lost her sanity and fallen into an endless bloodlust, Arcueid began a frantic slaughter of every living being around her, regardless of friend or foe.
Akatsuki saw the right moment and released her grip on Arcueid, letting her own body be blown away by the magical energy within Arcueid, using it to distance herself from the now-berserk Arcueid.
A hint of fatigue showed in her eyes, but it was overshadowed by the pleasure of a successful scheme. While Arcueid was not restraining her Bloodlust Impulse at all, it gave Akatsuki enough time to recover and seize Arcueid's authority.
In this battle, Akatsuki was the victor.
She had successfully triggered Arcueid's rampage and was plundering Arcueid's power with all her might.
The True Ancestors inside the Millennium Castle had just reached Arcueid's vicinity when they were sent reeling by that massive magical energy. Before they could regain their senses, Arcueid's death-dealing figure was already beside them.
Bloody flowers bloomed one after another in the pale blue sea of flowers. Arcueid's originally neat and clean clothes were instantly stained with blood. When the first True Ancestor was completely killed by Arcueid, all the True Ancestors present quickly scattered and fled, not even entertaining a single thought of resistance.
After all, Arcueid was the individual most likely to stably allow the King of the Moon, Crimson Moon, to be resurrected. Even before going berserk, she could crush fallen True Ancestors. Now that she had completely lost control, how could these remnants of Crimson Moon possibly be her match?
The True Ancestors scattered and fled, wanting to leave the Millennium Castle, but the Millennium Castle had long since been sealed by Akatsuki. No one could enter or leave directly, not even these True Ancestors who had stayed in the Millennium Castle for hundreds of years!
Digesting Arcueid's power, Akatsuki's body recovered rapidly. The flesh torn by Arcueid squirmed and grew back. Lying in the sea of flowers in the Millennium Castle's courtyard, Akatsuki looked at the golden moon overhead and quietly waited for the slaughter to end.
Listening to the sound of flesh being torn and the screams as lives faded away, Akatsuki's soul suddenly felt a surge of uncontrollable thirst. The next moment, the light of divinity flickered, and a powerful divinity suppressed Akatsuki's Bloodlust Impulse, then vanished into Akatsuki's soul.
The one-sided slaughter did not last long. As the final scream rang out, the entire Millennium Castle was left with only Arcueid's frenzied roars.
Having mostly finished digesting Arcueid's power, Akatsuki's left eye gradually turned golden. She calmly looked at the blood-soaked Arcueid, sensing a special connection between herself and Arcueid.
This connection was like the one between her and Matou Sakura, yet different. She could exercise absolute control over Matou Sakura; even if she ordered her to kill Shirou Emiya, Matou Sakura's body would be unable to resist Akatsuki even if her soul resisted frantically.
Arcueid was different, however. If she resisted her control with all her might, she might actually be able to rebel for a moment.
At the same time, a new connection emerged within Akatsuki's body. This connection was not a contract; though weak, it certainly existed.
This was the precursor to the birth of the earth uo.
Seeing Akatsuki stand up, the maddened Arcueid immediately charged at her. However, while a mindless Arcueid was terrifying, she was somewhat inadequate compared to the current Akatsuki.
Akatsuki stood her ground without moving. Countless silver chains instantly surged from the depths of the Millennium Castle, binding Arcueid tightly in mid-air. The binding technique was quite proficient, making Akatsuki involuntarily think of many 'teachers.'
Bound in mid-air, Arcueid instinctively tried to rush at Akatsuki, but it was all in vain. Having lost most of her power, Arcueid couldn't even cause a single change in the chains that originally belonged to her.
"Hiss..."
Looking at the frenzied Arcueid, Akatsuki's hand paused as she suddenly realized the fact that she had just kissed Arcueid. Although it was to force Arcueid to drink her blood, what was done was done, and Akatsuki would not deny it.
"I guess I have no choice but to give myself to her in marriage... Just kidding."
Akatsuki wiped the non-existent drool from the corner of her mouth. To end Arcueid's rampage, Akatsuki, who possessed neither the Mystic Eyes of Death Perception nor the Demon Repelling Impulse, raised her hand and cut Arcueid into seventeen pieces.
Sitting before Arcueid's remains, Akatsuki looked at the bright moon in the sky, her thoughts unknown.
Suddenly, Akatsuki remembered a famous person once said, 'Only by constantly reflecting on oneself can one become a better version of oneself.' So, she made an effort to reflect on her life since transmigrating.
She wouldn't say she committed every evil imaginable, but she had certainly been a bit of a bully.
Akatsuki: "..."
Akatsuki tried hard to find a single memory of doing a good deed from her memories.
In the end, she only thought of a few things.
She 'persuaded' those three punks to turn over a new leaf; she heard that later, those three punks got into a street fight and were sent straight to jail.
She forcibly created a world where Illya survived.
The latter counted as a good deed, but the former didn't have much to do with Akatsuki.
Thinking about how she forced the Tohsaka sisters to be unable to leave her... "Hiss..." Akatsuki suddenly took a sharp breath. "Did I transmigrate into some restricted-grade fanfic from a certain forum or book bar?!"
A moment later, Akatsuki cleared the wild thoughts from her mind. Even if it were as she suspected, she was the beneficiary, so there was no need to worry about it.
"Yeah, that's right."
So Akatsuki decided to temporarily leave her brain in the Millennium Castle.
「Brain Storage Area」
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