Actually, Rozen was well aware that Natsuki didn't want him to go to Shinjin Lake because she was worried about him.
The existence of the Fourth Primogenitor could very well affect the seal at Shinjin Lake. His magical power might stimulate the spiritual entity sealed within, but the reverse was also true.
Perhaps the spiritual entity sealed in Shinjin Lake could, in turn, affect the seal within Rozen's body, provoking the Original and causing it to break free, inflicting irreversible harm on him.
For Natsuki, this was undoubtedly unacceptable.
After disappearing for two months, Rozen had finally returned, only to plunge headlong into such a dangerous situation. How could Natsuki possibly agree to that?
That was why she was doing everything in her power to stop Rozen, refusing to let him go to Shinjin Lake and even trying to keep him from learning about Nagisa and Avrora's situation.
Of course, Natsuki wasn't indifferent to Nagisa and Avrora's safety either. But since it was a national requisition order and the best choice for dealing with the seal at Kannawa Lake, as a national Attack Mage, she ultimately had no choice but to turn a blind eye to their circumstances.
However, when it came to Rozen, Natsuki couldn't just ignore the matter.
Thus, she had resolved that even if she had to resort to force, she would stop Rozen from leaving.
Just as Natsuki steeled herself with this determination—
"I almost forgot to tell you, Natsuki-nee."
Rozen suddenly spoke up.
"Actually, the Original is gone. There's no longer any seal inside me."
These earth-shattering words spilled from Rozen's lips, reaching everyone's ears.
"What!?"
Shizuka Koyomi gasped in shock.
"The Original is gone…!?"
Yukina also whipped her head toward Rozen, her face filled with astonishment.
"No seal…?"
Natsuki's pupils contracted sharply, her expression changing drastically.
Seeing this, Rozen smiled faintly.
"During my time wandering in another world, I had some… encounters. Not only did I gain powers like Time Manipulation Magic, but I also managed to erase the Original, making her disappear completely."
Rozen revealed this truth.
"Now, the Original is no longer inside me. There's no seal in my body anymore."
"I took her magical power and her Beast Vassals, burning her away along with the vampire's curse."
"So, the Fourth Primogenitor no longer exists in this world. There's only the person who stole the Fourth Primogenitor's power."
"And that's me—your younger brother, Minamiya Nichiyo."
As he spoke, Rozen unleashed his magical power.
Like thunder roaring over Itogami Island, terrifying magical power erupted from Rozen's body, soaring into the sky like a volcanic eruption, transforming into a shockwave that swept out in all directions.
The atmosphere trembled violently.
The ground shook intensely.
At that moment, the entire Itogami Island quaked, the artificial island's surroundings churning with towering waves, surging and roiling as if the world was ending. The island's residents screamed in panic, descending into chaos.
"Senpai!"
Yukina, who was closest to Rozen, was forced back by the overwhelming magical power. She quickly drew the Mechanical Demon-Purging Assault Spear Mark Seven from her guitar case, unfolding it and slashing down to cut through the wave of magic.
"This magical power…!"
Shizuka Koyomi raised her arm to shield her face, her expression one of utter shock.
Natsuki, however, stood firm amidst the surging magical energy, her clothes and hair whipping violently in the wind, not retreating a single step as she stared fixedly at Rozen.
The immense magical power Rozen unleashed had reached the scale of a Primogenitor's, surpassing even the dragon veins beneath Itogami Island, causing them to let out a mournful cry.
But this astonishing power came and went just as quickly.
The next moment, the magical energy was instantly reined in, vanishing without a trace as everything returned to calm.
"Well?" Rozen said calmly. "This level of magical power—there's no way I could've possessed it before, right?"
Unless he broke the seal, Rozen had indeed never been capable of such a feat.
But everyone could clearly see that there were no seals on Rozen's body. The magical power he had unleashed was entirely his own.
In other words, this human now possessed magical power comparable to that of a Primogenitor.
As he had said, there was only one explanation.
He had truly taken the Fourth Primogenitor's power for himself.
Though he had discarded the vampire's curse, lacking their immortality, in terms of pure power, Rozen was now on par with the Fourth Primogenitor—or even stronger, since he still possessed means beyond just Beast Vassals.
The world's strongest vampire no longer existed.
The former God-slaying weapon had been erased.
What remained was merely a human who had seized the strongest power.
A human wielding divine power and the power to slay gods.
This was Minamiya Nichiyo.
"I know how to deal with gods, and I know how to handle God-slaying weapons. The seal at Shinjin Lake might be something others can't handle, but I've sealed the Original before, sealed the legacy of the Holy Annihilation, and even stolen the Fourth Primogenitor's power. That's why I'm the most suitable person to go to Shinjin Lake."
Rozen spoke to Natsuki like this.
"Even knowing all this, do you still refuse to let me go, Natsuki-nee?"
This time, Natsuki finally fell silent.
She didn't know how to describe what she was feeling right now.
The seal inside Rozen was gone. The dangerous existence known as the Original had been destroyed, its power stolen by Rozen, leaving no further cause for concern. This undoubtedly filled Natsuki with joy and pride.
Her younger brother had reached heights unimaginable to others—as his older sister, Natsuki couldn't help but feel proud.
But at the same time, Rozen's rapid growth also left her somewhat wistful.
Rozen truly no longer needed her protection. To him, her protection had become entirely unnecessary.
This realization made Natsuki inwardly sigh.
And then—
"Do whatever you want. I don't care anymore."
With those words, Natsuki turned and disappeared on the spot.
She had finally relented.
"I'm sorry, Natsuki-nee. Once I return, you can punish me however you like."
Rozen quietly watched Natsuki leave, his heart filled with mixed emotions.
After all, Natsuki had only been trying to protect him, yet he had repeatedly went against her. How could he not feel conflicted about that?
But—
"I'll resolve the situation at Shinjin Lake and bring Nagisa and Avrora back as soon as possible."
That was the only promise Rozen could make.
"I assume you won't object to me going anymore either, Senpai?"
Rozen turned to Shizuka Koyomi.
Having recovered from her shock, what could Shizuka Koyomi say?
"Since Your Highness has already erased the Original, and you possess the means to seal and deal with God-slaying weapons, you are undoubtedly the best candidate to resolve the Shinjin Lake incident."
Though her expression was bitter, Shizuka Koyomi spoke up.
"However, I hope you will take Himeragi Yukina with you to Shinjin Lake."
It seemed that even with the Original gone, the Lion King Agency had no intention of lifting their surveillance on Rozen.
No—perhaps it was precisely because the Original was gone that surveillance was even more necessary.
Now that Rozen no longer had any lingering vulnerabilities, and had instead stolen the Fourth Primogenitor's power, becoming unprecedentedly powerful—combined with the unknown powers he had gained in another world and the protection of gods—his existence was now more extraordinary and terrifying than even a Primogenitor's.
That was Shizuka Koyomi's conclusion.