Izumi could only stare at Rias in silence.
But the moment a mischievous glint flashed in his eyes, he leaned back and said:
"That world is extremely dangerous, you know."
"There are multiple True Ancestors. And they're absurdly strong."
"One of them could literally drop the moon on you if she feels like it."
(A certain Crimson Moon: "Indeed, I could.")
Rias and the others froze, stunned.
Drop. The. Moon?
Was he serious?
Even Irisviel and Tohsaka Rin exchanged bewildered looks.
Did their world have someone that monstrous?
How did they not know!?
Izumi grinned, clearly enjoying their disbelief.
"I'm not joking."
"If you'd arrived a bit earlier, you would've met the legendary King Arthur and the Queen of the Land of Shadows, Scáthach."
"All those mythic figures exist over there—and many of them become Heroic Spirits."
"Their original selves are terrifying."
"Some entities can make transcenders look like small fry."
"And that's not even counting stuff like Mystic Eyes—"
He continued rambling enthusiastically.
Parallel world traversal, Ultimate Ones, planetary wills…
All sorts of Type-Moon terminology poured out of him like a flood.
Honestly, that world had an absurd number of beings at transcendent levels.
Compared to it, this world wasn't lacking, but the density of absurdity was insane.
Many Heroic Spirits, in their original forms, were outright broken.
And the Grand classes—those were transcenders, or almost transcenders.
By the time he finished, Rias looked equal parts overwhelmed and amazed.
Himejima Akeno chuckled.
"If Serafall knew there were actual magical girls in that world, she would be overjoyed."
Izumi snorted.
"That group of girls? Sure, I'll bring them over someday."
"I can travel there whenever I want now."
"And that world's parallel timelines are converging. Soon it'll stabilize into a single world."
"I want to see what happens when that change completes."
When the world lines settled, he would definitely return.
And hey—he still wanted to visit Chaldea.
There were certain "eggplants" there he found very intriguing.
The others looked excited.
Despite the danger, curiosity outweighed caution.
After all, those monsters wouldn't just pop out randomly… right?
Izumi could read their thoughts easily.
But he didn't comment.
After giving them a crash course on the other world, he headed to the kitchen to prepare dinner.
Rias and the others stayed until late.
It became an impromptu welcome party for their otherworldly guests.
A celebration for those who had crossed worlds to reach this one.
...
Later, when everyone had left, Izumi handed several books to Rin, Sakura, and Irisviel.
Schedules, local culture, fundamentals—basic knowledge of this world.
He didn't want them going to school completely blind.
Even though enrollment would wait for next semester, preparation had to start now.
At dinner, Irisviel had casually mentioned she wanted to become a teacher at his school.
Izumi nearly dropped his chopsticks.
Rias, however, approved immediately.
If another world's system could be integrated into Kuoh Academy, it would be revolutionary.
Irisviel wanted it.
Rias had no objections.
The two instantly hit it off.
Rias even offered a ridiculously high salary to secure her.
A true capitalist move.
Izumi didn't bother stopping it.
If Irisviel wanted to do something, she should.
He wasn't going to lock her away just because she was from another world.
...
That night, alone in his room, Izumi sorted through his spoils.
He was just about to dump a bunch of treasures into the system—
When the door swung open.
Asia dove inside and threw herself onto him, eyes shining with longing.
"Izumi-sama, I missed you so much!"
With no one else around, Asia let her restraint crumble.
It had been a week since she'd seen him.
Her yearning had reached a breaking point.
Izumi sighed inwardly.
He had no choice but to offer up his "savings."
...
Soon after, Irisviel also slipped in.
And Sakura, following behind.
In the blink of an eye, four people crowded together—
To play mahjong.
The clatter of tiles echoed through the room.
Laughter and cheering soon followed.
If not for the room's heavy soundproofing, the entire household would've joined in.
Izumi stared at the excited group, helpless.
He had planned to organize his treasures tonight.
But looking at their bright, eager faces—
"…Tomorrow. I'll do it tomorrow."
...
The next morning, after preparing bentos, Izumi walked to school with Asia.
Le Fay had gone home; only Izumi and Asia attended now.
One more week until summer break, so he planned to actually go to class for once.
The others stayed home to study.
With Rin and Sakura around, he didn't worry about the two lolis.
And next semester, the Einzbern maids from his pocket world could help.
Walking the familiar path, Izumi felt oddly nostalgic.
Like he hadn't experienced something so everyday in a long time.
When they entered the classroom, many students stared at him strangely.
Where had he disappeared to for a whole week?
Sawamura Spencer Eriri noticed him first.
A flicker of surprise crossed her eyes.
As soon as Izumi sat down, Eriri leaned over, curious.
"Where did you disappear to?"
"You actually took a whole week off?"
Izumi raised a brow.
"…Are you worried about me?"
"That's rare."
Eriri flushed red instantly.
"W-who's worried about you!?"
"Stop being narcissistic!"
A perfect textbook tsundere reaction.
Izumi couldn't help but laugh.
Eriri was always Eriri.
Even if she cared—she'd never admit it.