A Multiversal Journey Beginning with the Supreme Sovereign

"Yes, yes, I understand!"

The captain was terrified and hurriedly replied.

Nangong Nayue ignored the security team members. Her expression was grim as she gritted her teeth and muttered, "...Aya, what kind of trouble are you trying to cause now?!"

Sendou Aya

Inside a classroom belonging to Nangong Nayue's class at Shiritsu Saikai Academy.

A tall woman in a magnificent Twelve Layered Robe, with gorgeous fiery eyes and the gentle aura of a refined Yamato nadeshiko, was using a magic-infused "pen" to write and draw across the blackboard like a teacher.

She was elegant and noble, with exquisite features. Her pretty oval face possessed a subtle charm amid its delicate grace, while her bright eyes and pearly teeth gave her a beauty capable of toppling nations.

The gentle, chrysanthemum-like air about her, combined with the cool allure at the corners of her eyes, made her an unparalleled beauty.

Sendou Aya, known as the Scribe Witch.

Like Nangong Nayue, she was also a Pure-blooded Witch.

Though she had attended school on String God Island alongside Nangong Nayue, her relationship with the island's administrators, the Artificial Island Management Corporation, was not particularly close.

No one knew how this Witch had become connected to the organization known as LCO—the Library. By the time people came to know her, she had already become LCO's leader, the Grand Scribe.

LCO was not an organization with a strict hierarchy. It was more like a group of people with shared goals gathering together for mutual support, with an extremely loose structure.

As a result, LCO had no actual headquarters. It had branches scattered throughout Asia, Europe, and other regions, which only theoretically obeyed their leader's orders.

In reality, LCO's leader had no ability to restrain the entire organization. Members of the various branches and squads acted on their own most of the time.

Yet it was precisely this decentralized way of surviving that had kept them, classified as "terrorists," from being wiped out and allowed them to endure until now.

"Natsuki, my ally... I know you must be in great pain right now. I will save you and grant you true freedom once more!"

"...Neither demons nor this island can bind you and make you endure suffering that was never meant to be yours."

"I will bring 'truth' to this world. Magic should never have existed in this world to begin with!"

Sendou Aya's fiery eyes were filled with determination and the pursuit of truth.

The members of LCO were called terrorists mainly because of their radical actions.

Yet judging from the organization's creed, its members were all fanatics in pursuit of truth and knowledge.

Since Sendou Aya had become the leader of this organization, she was naturally no different from its other members in that regard.

Through her extensive research into history, the ancient Celestial Tribe, Sin God Cain, and the Great Calamity, Sendou Aya had reached a conclusion.

That was, magic had not originally existed in this world. It had been brought here by the Celestial Tribe and Sin God Cain.

Sendou Aya was not the first to propose this theory. Outstanding magicians had put forth the same theory in the past.

However, since it could not be proven, the theory had never gained much traction.

After conducting her own research, Sendou Aya became utterly convinced of this theory and found a way to prove it.

To prove it, she needed to use the Grimoire known as the Dark Oath, a forbidden text even within LCO.

Even as its leader, Sendou Aya could not casually use such a Grimoire, which was why she had never put her plan into practice before.

But Nangong Nayue becoming a Witch had thoroughly provoked Sendou Aya, stirring the deepest wish in her heart.

After weighing the pros and cons, Sendou Aya finally decided to act.

This operation would not only allow her to prove her theory, but also save Nangong Nayue. In Sendou Aya's view, it was a plan that killed two birds with one stone.

After Nangong Nayue became a Witch, Sendou Aya left String God Island and traveled to one of LCO's Asian branches, using her authority to retrieve the Dark Oath.

Another important reason Sendou Aya could become LCO's leader was that, as the Scribe Witch, she possessed the ability to record Grimoires.

To LCO, which was devoted to protecting Grimoires and preventing their abuse, such an ability seemed tailor-made for the organization.

Over the past few months, she had used her Witch's power to thoroughly grasp the Dark Oath's method of use and conduct an in-depth study of the techniques within it.

Only after making all those preparations did she infiltrate String God Island on this day, intending to initiate a grand ritual within the school she and Nangong Nayue had both attended.

"But after this, LCO will no longer tolerate me, won't it?"

Sendou Aya held a pen in her slender, fair fingers as she etched intricate patterns throughout the classroom.

She murmured softly, but her tone was filled with disdain for LCO.

As its leader, she was more like a tool selected by LCO's many members, so Sendou Aya felt little sense of belonging toward the organization.

This time, she had violated the organization's creed by taking a forbidden book from the archives. Most of the organization would likely be furious over it.

Sendou Aya could not be bothered with those people. As long as she could prove her theory and fulfill the wish buried deep in her heart, everything would be worth it.

Besides, she had not gained nothing during her years in the organization. She still had several steadfast followers of her own.

With those followers, she no longer needed to worry about what came afterward.

"That should be enough."

After recording the final symbol onto the classroom wall, Sendou Aya revealed a satisfied expression.

She casually tossed aside the pen in her hand and lightly clapped her fair hands together.

Then she slowly turned around. Her magnificent Twelve Layered Robe trailed across the floor, her hands folded before her as she smiled faintly and said, "...You finally came, Natsuki, my ally!"

Sendou Aya had not drawn any technique to prevent Space Control here. As she smiled with her gentle eyes, the empty space before her rippled.

Nangong Nayue's petite, beautiful figure, dressed in a Gothic Western Dress, appeared before Sendou Aya.

"Aya, what trick are you playing?"

The moment she appeared, Nangong Nayue aggressively demanded an answer from Sendou Aya.

Then Nangong Nayue noticed the mysterious runes covering the entire classroom, as well as the Grimoire in Sendou Aya's hand, which radiated an ancient aura.

"What is that book?"

Nangong Nayue did not recognize the Grimoire's true nature, but if the Scribe Witch was holding it, it could not be anything ordinary.

Sendou Aya did not conceal anything from Nangong Nayue. She gave an intelligent smile and said elegantly, "...This is the Dark Oath. I'm sure you've heard of it too, Natsuki."

"...There is no need to worry, nor any need to fear. Before long, the Dark Oath's power will envelop all of String God Island."

"I will halt the movement of all magic, then free you from that pitiful fate!"

"...Natsuki, come and stand with me. I will take you from the demon's hands and grant you the freedom you truly desire!"

Sendou Aya invited her in a resolute tone.

I Will Save You from the Demon's Hands!

"The Dark Oath?!"

Upon hearing Sendou Aya's words, Nangong Nayue's expression darkened.

She parted her crimson lips and stared at Sendou Aya with an incredulous expression, her words slightly slurred. "...Aya, do you know what you're doing?"

"...How could you use this forbidden Grimoire, and on String God Island of all places?!"

The Dark Oath was renowned even among magicians. It could be considered one of the most terrifying Grimoires LCO had ever collected.

Once activated, the technique within this Grimoire could alter the "laws" within a certain range, allowing its user to become like a creator god within that area.

However, although the Dark Oath was powerful, it was not impossible to counter.

As long as it was a technique manifested through a Grimoire, there was a possibility of breaking it.

Furthermore, the technique's effect was so exaggerated that its required magical power was equally immense. Even a True Vampire would struggle to manifest it using their own magical power.

For that reason, the Dark Oath could only be used at a specific time. Its technique could only be activated successfully when the stars returned to their proper positions.

It borrowed the power of the stars. Once that day passed and the astrological timing was missed, the Dark Oath's technique would be lifted as well.

From that perspective, even if someone used the Dark Oath, it did not truly matter. So long as they endured the night, the technique would disappear the following day.

But Sendou Aya's words clearly told Nangong Nayue that what she intended to change with the Dark Oath was the very existence of magic!

It would not matter if this effect were used elsewhere, but this was an artificial island built through magic and magitech.

The island remained afloat on the Pacific Ocean by relying on magic, and many of its mechanisms and facilities also operated through magical power.

If Sendou Aya truly deployed her technique and covered String God Island with it, the island would collapse and sink into the ocean in an instant!

In the eyes of any ordinary person, Sendou Aya's actions were an outright terrorist attack.

"Of course I know what I'm doing, Natsuki!"

Faced with Nangong Nayue's questioning, Sendou Aya smiled sweetly. Her gorgeous fiery eyes watched her ally as she spoke sorrowfully.

"...Magic should never have existed in this world. It is merely something foreign brought by the Celestial Tribe and Sin God Cain."

"What I intend to do is restore truth to this world and allow people to see its true face!"

"...Without magic, Pure-blooded Witches like you and me would never have been born, nor would we have sold our souls to demons."

"Natsuki, we are allies. I will save you, rescue you from the demon's hands, and take your soul back from that demon!"

"...Join me, Natsuki! Let us face this world's truth together!"

Sendou Aya gazed at Nangong Nayue in a pleading tone, hoping for her answer.

Nangong Nayue remained exceptionally calm at that moment. She slowly shook her head. "...I'm sorry, Aya. This is the one thing I cannot agree to."

"...If I agreed with you, the hundreds of thousands of people on String God Island would be buried alongside it."

"I know LCO has been recognized as a terrorist organization by many countries, and I know you have committed crimes elsewhere, Aya."

"...But as you said, we are allies. So long as you do not commit crimes on String God Island, I will pretend not to see them."

"After all, I am merely String God Island's Demon Slayer, not some guardian of world peace... So, Aya, please come to your senses. Do not do anything foolish."

Nangong Nayue had an overwhelmingly forceful personality. Normally, she would never speak in such a pleading manner.

But Sendou Aya was an exception.

She was one of Nangong Nayue's few friends—perhaps even one of only two.

No matter how self-centered she was, Nangong Nayue found it difficult to harden her heart against her friend.

"I am very happy to hear you say that, Natsuki, but my resolve will not waver."

"...I understand you as well. For you to say such things already counts as showing weakness to me, but I also know that your will is just as unyielding."

"Since neither of us can persuade the other, let us settle this through battle!"

Sendou Aya's voice gradually turned cold. "...But remember this, Natsuki! Though I do wish to prove my theory, more than anything, I am doing this to save you!"

Nangong Nayue sighed softly, and her gaze became resolute as well. "...Then it seems we have nothing left to say, Aya!"

"...I will arrest you and lock you inside the Prison Barrier so you can reflect on your actions!"

At that, Sendou Aya covered her lips with one hand and giggled. "...If you can manage it. Today is precisely when the stars return to their proper positions!"

"...Natsuki, I have prepared for this day for a long time. You never had any chance of winning from the very beginning!"

As Sendou Aya's words fell, countless strange patterns appeared across the walls of the entire classroom.

Every one of those patterns was a technique's inscription.

As the patterns emerged, several fixed stars in the sky shone with dazzling light. The patterns rapidly expanded, soon spreading from the classroom to cover the entire school.

The technique's range continued expanding, spreading outward in every direction from the school. Within its bounds, all magical fluctuations vanished.

Once the technique covered all of String God Island, the island would undoubtedly sink beneath the sea!

As the technique activated, Nangong Nayue's expression changed. She immediately used her Space Control Technique, but the technique that had always flowed smoothly now became sluggish.

In the critical moment, Nangong Nayue rolled aside and dodged a black longsword slashing down at her from behind.

A knight clad in black armor had appeared behind Nangong Nayue at some point.

Had Nangong Nayue not been an outstanding Demon Slayer who had undergone rigorous training, that strike would have left her without a corpse to speak of.

"It is useless, Natsuki! All magic has already vanished here. Even a True Vampire cannot possibly be my opponent within the Dark Oath's range."

"...Within this area, only my magical power remains."

"Surely you have not forgotten? I am called the Scribe Witch, and I can record the magic of other magicians."

"...I have already recorded the Space Control Technique you specialize in. Within this space, I can skillfully wield your technique!"