After hearing from Izumi that he would return in time, Rias finally felt relieved.
But for Izumi, the sense of urgency only grew stronger.
If the girls around him didn't become stronger soon, things would truly become dangerous once the invasion from the other world intensified.
He couldn't possibly protect them every moment of every day.
Of course, he could simply place them all inside his own world and keep them safe like birds in a cage.
But that wasn't what Megumi Katō or Eriri Spencer Sawamura wanted.
Compared to living as protected ornaments, they would much rather fight with their own strength.
Thinking of that, Izumi suddenly felt a trace of regret.
Back when he transformed into that dragon form, he shouldn't have held back.
If he had gone all out, he might have destroyed that world completely.
But regrets were meaningless now.
With his current strength, he no longer feared anyone in that world.
As a four-digit transcendence-class existence, even if he faced Rizevim Livan Lucifer or Melvazoa, he wouldn't hesitate.
If those two joined forces, it might be troublesome—but surely the forces of this world also had hidden trump cards. Otherwise, they wouldn't have held out this long.
For now, the priority was simple.
Strengthen everyone as much as possible in the shortest amount of time.
And, if possible, push his own strength even further.
For example, obtaining more Solar Authorities and advancing to a three-digit class.
But realistically… that was almost impossible.
Unless he discovered entirely new worlds.
In a world like the Nasuverse, there was little left that could serve as offerings.
He could already recreate most of those items himself, so the system wouldn't accept them.
Or… would he offer the Root itself?
He shook his head.
Impossible.
After staying for a while, Rias and the others eventually left.
As she departed, Kuroka looked at Izumi with a strange gaze.
Clearly, she was plotting something.
And before long, Izumi learned exactly what that was.
That night, a shadow slipped past his window.
Kuroka jumped inside.
Izumi simply stared at her.
Beside him sat Ophis.
The moment Kuroka noticed the two of them watching her, she froze.
"Uh… good evening!"
She was panicking.
She hadn't expected Ophis to be here.
Ophis tilted her head, unable to understand why Kuroka had come.
Izumi rubbed his chin.
"Breaking into my room in the middle of the night… are you here to assassinate me?"
The moment he said that, Ophis's gaze toward Kuroka changed.
Kuroka was horrified.
"No! I'm not! I would never!"
She could practically feel Ophis deciding whether to eliminate her.
It was terrifying.
Seeing her reaction, Izumi chuckled and beckoned.
Kuroka was instantly pulled toward him.
Grabbing her chin, he asked,
"Little cat, be honest. Why are you here?"
Kuroka pouted and looked away.
"You stole my little sister. You don't mind taking one more, right?"
"I want to bear your child too."
That was her true purpose.
If she could give birth to his child, it would surely be the strongest.
Izumi was speechless.
As expected of Kuroka.
But he had no intention of refusing.
Why reject someone who came willingly?
Just as he thought that, several magic circles suddenly appeared in his room.
Then Rias and Akeno emerged.
Silence filled the air.
Kuroka froze.
They had the same idea?
Rias and Akeno also twitched when they saw her.
"What a coincidence," Izumi said with a grin.
"Perfect. Let's play a game."
They were all staring at him.
He didn't back down in the slightest.
For the next few days, Izumi spent his time in blissful company.
Eventually, Megumi and Eriri finally arrived.
Seeing them, he couldn't help but complain.
"I thought you'd forgotten we were leaving."
"You finally showed up."
Both girls blushed.
"Sorry," Eriri said awkwardly.
"My father dragged me off for tests. He didn't believe my strength had improved so much."
When she returned home, her parents had been shocked.
They didn't believe the power was real and insisted on testing her at the Church.
Although she couldn't reincarnate as an angel—because she might fall—their family still had close ties with the Church.
So she had been examined thoroughly.
Megumi's situation was similar.
Their parents had simply been worried about side effects.
Once Izumi understood, he nodded.
For ordinary families, such rapid growth was naturally alarming.
"Alright then," he said.
"Let's depart."
They had already prepared everything.
Izumi called Irisviel, Rin Tohsaka, and Sakura Matō, telling them to get ready.
Then he sent Asia, Kanon, Avrora, and Ophis into his Small World.
They would remain there temporarily.
Once things were stable, he would bring them out.
With everything arranged, Izumi locked onto the neighboring world.
Without hesitation, he tore open space and stepped through with the others.
At that moment, Gaia and Alaya felt their world being forcibly torn open.
When they realized it was Izumi, they trembled.
Because he had become far stronger than before.
Even if they fused all parallel versions of themselves together, they still felt as if they might burst under the pressure of his presence.