Inazuma City — Naganohara Fireworks Store.
At dawn, soft morning light had barely brushed the eaves when Yoimiya gently tapped on the guest room door.
"Su Xuan, are you awake?" she asked softly.
No reply.
After waiting for quite some time, Yoimiya pushed the door open—only to find the neatly arranged room completely empty.
"…Huh? Where'd he go?" Her expression froze.
Yesterday evening, someone had knocked on the shop's door.
When she opened it, she found a black-haired, dark-eyed young man standing there. He introduced himself as Su Xuan.
He said he had no Mora, had run into severe hunger on the road, and hoped to stay for a night.
Yoimiya immediately noticed he wasn't a local. And with the Sakoku Decree and the Vision Hunt Decree still being enforced, life was harsh for outsiders.
She didn't think too much about it—she simply let him stay.
But now—
"Where did he disappear to so early?" A faint worry rose in her chest.
Inazuma now was not the Inazuma of the past.
Even if no one spoke of it aloud, everyone knew:
For foreigners, Inazuma was a cage.
Without someone to vouch for them, they would be stopped and questioned everywhere. The Kanjou Commission and Tenryou Commission would demand outrageous processing fees just to issue temporary residency.
"And he didn't have even a single Mora… If he gets questioned, they'll think he's an illegal entrant and throw him straight into prison!"
Panicked, Yoimiya hurried toward the door to go find him—
Then a glimmer of golden light reflected across the room.
She turned—and froze.
On the desk, a thick stack of Mora was piled neatly, catching the sunlight in dazzling gold.
Underneath the stack was a note.
**Fireworks may bloom only for a moment, yet their radiance lingers in people's hearts forever.
Thank you, Queen of the Summer Festival.
Until we meet again.**
"Ah—" Yoimiya's face instantly flushed red.
Fireworks—fleeting, yet eternal.
That was how Yoimiya understood eternity.
And his words struck that belief directly, like a spark landing on tinder. For a moment, she felt her heart stutter.
But then—
"…Wait. The Mora."
Her eyes widened.
"Didn't he say he had no Mora?"
"Then what is with this huge pile!?"
As she fumbled through the stack in disbelief, something slid out from behind it.
A notebook.
Its golden edging shimmered faintly with an otherworldly glow.
On the cover were bright, elegant characters:
Su Xuan's Travel Diary — Shared Copy (Yoimiya's Edition)
"W-wha— A glowing diary!?"
Yoimiya rubbed her eyes hard.
But when she opened them again, the book was still glowing.
"'Yoimiya's Edition'… So… it's specifically meant for me?"
"Does that mean… I'm allowed to read it?"
Yoimiya knew reading someone else's diary was rude—immoral, even.
But the words Yoimiya's Edition felt like a deliberate permission.
Like this diary and she were connected in some inexplicable way.
"…Just a tiny peek?" she whispered, already opening it carefully.
The first page didn't contain travel notes—only a message of warning:
The holder of this diary cannot disclose its contents to anyone else by any means.
Only Su Xuan and other diary holders may perceive it at all.
"…So I'm not the only one with a copy?"
"Just what is Su Xuan… that his diary is being distributed to multiple people?"
Her curiosity spiked. She turned the page.
And then—his handwritten entries began.
I've transmigrated.
And of all places—I landed in Teyvat.
Unfortunately, I arrived in Inazuma. Inazuma during the height of the Sakoku Decree and the Vision Hunt Decree, no less.
Luckily, I happened to appear near a kind person's home.
Before the Shogunate patrols could find me, I knocked on her door.
As expected, she was as kind as she seemed. Even after hearing I had no Mora at all, she took me in warmly.
And even cooked me dinner.
"…Transmigrated?"
"Like in that novel 'Reborn as the Raiden Shogun, Now I'm Unstoppable'?"
"So Su Xuan came from another world?"
Yoimiya's mind went blank.
People in Teyvat knew of stories about reincarnation or transmigration—
But no one had ever met a real transmigrator.
This was her first.
And she couldn't help being excited.
"So he really is a transmigrator…"
"And he… already knew about me…"
Heat rose in her face as she re-read the words kind, warm, good-hearted.
"No wonder he knocked on my door specifically… He knew I'd take him in…"
The diary continued:
The room she prepared for me was very comfortable.
But this world is dangerous, filled with beings who wield powers beyond mortal sense. I couldn't sleep, anxious about my future.
Until, late at night, I heard a soft ding.
A power from beyond this world awakened within me.
And I know—this is only the beginning.
With time, I will grow stronger. Much stronger.
"…Huh??" Yoimiya blinked rapidly.
"Hear a ding → get otherworldly power?? Just like that?!"
"That's even easier than 'Reincarnated as a Hilichurl, Gain Power by Eating Sunsettias'!"
"Is he… bragging?"
The diary continued:
To gain more power, I must begin my journey.
But before leaving, I wanted to thank the kind girl who sheltered me.
And I also needed Mora to travel.
The two problems were easily solved together.
So under the cover of night—
I robbed the Kanjou Commission.
Yoimiya: "!?!?!?!"