Not long after the world of KonoSuba World had fully merged—
Another tremor shook Izumi's domain.
Before he even had the chance to bring Cecilia to greet the newly arrived goddesses—
The world vibrated once more.
This time—
It was the arrival of the DanMachi World.
And as if by coincidence—
The two worlds appeared side by side.
The first thing to manifest…
Was the city of Orario.
At its center, towering high into the heavens—
stood the unmistakable Babel Tower.
Seeing that iconic structure, Izumi raised an eyebrow.
"…Now that's convenient."
"Two worlds at once, huh?"
"And Loki actually pulled it off?"
Without hesitation, Izumi took Cecilia along and headed straight toward Orario.
The entire city was in celebration.
Cheers echoed across the streets.
Adventurers, gods, civilians—
Everyone was rejoicing, excitement written across their faces.
Yet—
Despite standing in the middle of the crowd—
No one noticed Izumi or Cecilia.
If Izumi didn't wish it, no one could perceive their existence.
After casually listening in on the conversations around him—
Izumi quickly pieced together what had happened.
"…That Loki…"
He couldn't help but chuckle.
"She really sold it well."
Apparently, Loki had convinced the gods of Orario with a rather… creative pitch.
According to her—
Once their world merged into Izumi's—
They would be free to use their divine power as much as they wanted.
No restrictions.
No limitations.
No fear of destroying the world.
Hearing that, Izumi couldn't help but laugh.
"Well… she's not entirely wrong."
"But whether they can actually use that power…"
"…depends on whether the world allows it."
Even in his domain—
Divine power wasn't unrestricted.
It could only be used within the framework of games.
That was the absolute rule.
Still—
The promise alone had been enough.
And Loki had successfully convinced them all.
After understanding the situation, Izumi left Orario with Cecilia.
Back at his residence—
Cecilia couldn't hide her concern.
"…Izumi."
"If my world merges into yours…"
"…will it really be okay?"
She hesitated.
"There are so many powerful races here…"
"Much stronger than humans…"
Izumi shook his head calmly.
"You're worrying over nothing."
"No matter how strong they are…"
"They can't harm humans under the rules."
He smiled faintly.
"You've seen it yourself these past few days, haven't you?"
Cecilia paused.
Then slowly nodded.
"…You're right."
Her worries gradually faded.
And in their place—
A firm resolve took root.
She turned toward him.
"Izumi."
"Send me back."
"I want to merge my world into this one."
Her voice was steady.
Determined.
But—
Izumi simply smiled.
"Not yet."
"Stay a few more days."
"…Then we'll go."
Cecilia hesitated for a moment—
Before nodding.
"…Alright."
Over the next few days—
Izumi continued guiding her through his world.
Showing her its wonders.
Its harmony.
Its diversity.
And slowly—
Without her even realizing—
Her heart began to change.
Until finally—
Before their return—
Izumi had completely won her over.
"…So this is Cecilia Schariac…"
He smiled to himself.
"Truly worth it."
...
Honkai World — Year 2014, Nagazora City
More than a decade had passed.
Despite Cecilia's disappearance—
The world had corrected itself.
The timeline had been restored.
And just as fate dictated—
Kiana Kaslana still came into existence.
At that very moment—
A disaster engulfed the city.
On the streets—
A silver-haired girl with twin tails sprinted forward, dragging along a black-haired girl in a sailor uniform.
Behind them—
Massive Honkai beasts gave chase.
Above—
Another girl descended from the sky.
Expressionless.
Cold.
As mechanical armor unfolded behind her—
She brought it crashing down upon the beasts.
BOOM!
From atop a distant building—
Izumi stood with Cecilia in his arms, watching the battle unfold below.
"…Interesting."
Cecilia, however—
Was staring intently at one particular girl.
Her brows furrowed deeply.
"…She looks…"
"…just like me…"
Returning to this world—
She had already learned that more than ten years had passed.
Strange—
But acceptable.
After all—
Traveling between worlds itself defied logic.
Time differences were nothing in comparison.
Still—
She couldn't ignore this.
"…Izumi."
"Who is she?"
Izumi thought for a moment.
"…A clone, most likely."
"Based on Kallen Kaslana."
"A vessel for a Herrscher."
"Probably another one of Otto Apocalypse's experiments."
Cecilia's expression darkened.
"…Otto…"
Her gaze sharpened.
Then—
Without hesitation—
She leapt.
"Let's go."
Izumi followed with a smile.
Below—
Kiana and the others had just finished arguing—
When two figures suddenly appeared before them.
Instantly—
All three girls became alert.
Bronya Zaychik deployed her weapon systems, aiming directly at them.
"Identify yourselves."
Kiana stared at them warily—
But the moment her eyes landed on Cecilia—
Her pupils shrank.
Because—
They looked too alike.
"…You…"
Her voice trembled slightly.
"…Are you… my mom?"
Smack.
Before anyone could react—
Izumi appeared right in front of her—
And flicked her forehead.
"Don't say nonsense."
"I don't have a daughter like you."
Kiana froze.
"…Eh?"
"Not my mom?"
"Then why do you look exactly like me?!"
Even Raiden Mei and Bronya exchanged confused glances.
The resemblance was undeniable.
But Izumi's reaction—
Clearly said otherwise.
Cecilia stepped forward.
Her gaze gentle—but firm.
"You're Kiana Kaslana… correct?"
"I am Cecilia Schariac."
"And… I am not your mother."
She paused briefly—
Before continuing:
"If you want to know who your real mother is…"
"You should ask Theresa Apocalypse… or Otto."
The truth—
Was far more complicated than it seemed.