Izumi clicked his tongue.
Why were all the strong people in this world so sharp?
One glance, and both he and Ophis instantly recognized Rin as an interworld visitor.
He pulled Rin back to her feet.
"Come inside already. She won't hurt you."
Rin's face was green.
Won't hurt me!? She already scared me to death!!
Everyone in this world was insane.
A few hours here and she'd already been chased by vampires, almost exploded, and nearly killed by a loli-shaped calamity.
Of course—
Izumi didn't realize the truth:
Only a very small number of people in this world could actually detect interworld visitors.
Rin's body carried dense "foreign world residue," which only SSS-class and above could detect.
And SSS-class beings were so rare that most lived in hidden realms, dimensional rifts, or the frontlines.
Ophis was simply the special case…
because she had been kicked out.
Izumi prepared some drinks and sat across from Rin.
"All right. Explain. How did you end up in our world?"
Rin pouted, frustrated.
"I don't know! I was summoning a Servant for the Holy Grail War.
But the summoning circle exploded, and I got sucked into some spatial crack."
"When I woke up… I was already here."
"And then those three vampires found me…"
Her voice trailed off.
Truly the worst day of her life.
Summoned a Servant?
More like summoned herself into isekai hell.
Izumi blinked.
"…That can happen?"
Before he could say more, Le Fay raised her hand like a student in class.
"She probably ran into a spatial collision and got thrown in."
"Our family records say this has happened before.
Usually whatever falls into our world is already dead, though."
"The worst case was when a zombie-type virus slipped in during a world collision.
It caused huge casualties."
"If the higher-level guardians hadn't reacted instantly, it could've infected the entire world."
"That's why anything from another world is usually destroyed on sight."
Le Fay ended with a scholarly flourish.
Rin finally understood why Le Fay tried to blast her into dust earlier.
Anyone from another world = potential world-ending catastrophe.
Izumi also looked surprised.
"So Rin's world is basically next door to ours?"
"That's interesting… we're literally neighbors?"
"But that world didn't merge into ours?"
"That's even more curious…"
Le Fay giggled proudly.
"World fusion isn't that simple, Izumi-sama~."
"Normally worlds have no will, so merging is automatic."
"But some special worlds do have a will of their own, so they reject merging."
"This is pretty advanced knowledge. Izumi-sama didn't know?"
She smirked with a playful glint.
Izumi felt personally attacked.
How the hell was I supposed to know that!?
Rin slumped.
So she really was thrown here for no reason…
"Then… is there any way for me to go back?"
"Can I return to my world?"
Her voice trembled.
This world was too dangerous.
Random people here could kill her.
And she had already run into vampires, werewolves, and things beyond reason.
She had been in this world for less than an hour.
Izumi frowned.
He honestly didn't know the answer.
Fortunately—
Le Fay answered again.
"Going back… is basically impossible."
"First, you need something that can lock onto your home world."
"Then you have to cross the dimensional rift."
"But that's also impossible."
"There's a giant guardian inside the rift—our world's frontline defense.
Anyone who steps inside without authorization will be eliminated instantly."
"So, Rin-san, you should give up on going home."
Rin's expression died.
This girl just told her absolutely nothing useful!!
She clenched her fists.
"There really is no other way!?"
"Didn't you say my world is right next to yours!?"
"Why can't it be located!?"
Le Fay rolled her eyes dramatically.
"Yes, it's 'next door.'"
"But do you think worlds are like houses!?"
"A world's 'next door' is unimaginably far.
You can't just walk over and knock."
Rin felt the last of her hope crumble.
So she really… couldn't go home?
Noooooooo!!!
While she silently screamed internally—
Izumi narrowed his eyes thoughtfully.
"…Something that can locate a world?"
"…I might have something like that."