When she had entered a foreign world for unknown reasons and searched fruitlessly for several days, it was a Lucifer named "Hiro" who found her.
He instantly revealed her name and identity as a traveler from another world.
From him, she learned there was a method to cross the world barrier and saw hope-but she temporarily gave up when she learned he lacked an extra "item" to send her back to her original world.
At first, she followed the oriental-looking Lucifer in the hope that once he obtained that "item," she could return to her world and continue fighting the rebels.
What she didn't expect was this.
Without any guarantee.
Without any oath.
With nothing more than a maid's promise.
That Lucifer raised her magical defense to an absurd level and increased her magic power again and again-from several times over, to dozens, then hundreds-for the ridiculous reason of, "I won't be using it."
Later, Grayfia could no longer remember how much magic power she originally had.
She only knew that within her body flowed vast, seemingly endless, inexhaustible magic.
For a time, she believed the other party was interested in her body.
That he intended to use such generous favors to make her grateful, to obtain reciprocation.
But in reality, until the very end, her "Lucifer" never touched her.
After bestowing upon her a pile of indescribably powerful abilities, he sent her back to her original world-the Devil race's Underworld, still locked in war.
He left behind only one line.
"You will have to wait for me for many years."
Grayfia herself couldn't say when she truly acknowledged him as her Master.
Perhaps it was the first time he strengthened her.
Perhaps it was every time he spared her chastity.
Perhaps it was something else entirely.
But regardless-
In less than a month together, that Lucifer had completely subdued Grayfia.
Body.
Spirit.
And even her soul, which had been influenced far more deeply than she herself realized.
She was willing to wait nearly two thousand years for a vague, illusory expectation.
(The original work never stated this explicitly. This is a fan-created setting.)
She had already used the "Random Gacha Machine," usable only once every hundred years, nineteen times.
In just a few more years, she would be able to use it for the twentieth time.
Recently, she discovered a human named "Hiro" in this country.
He had the same name.
The same appearance.
But due to the enormous difference in aura, spiritual rank, and strength, she merely observed silently, offered a little "guidance," and did not rashly confirm his identity.
Because of her greatly enhanced "Anti-Magical Campione" constitution, she even accidentally placed that human boy at a disadvantage in a battle two days ago.
That left her feeling faintly guilty.
Yet the fiery red card the boy had once used on another "otherworld traveler" stirred her memories.
Her Master-Lucifer-had used such a small card as well.
To send her back.
Leaving only the same explanation.
"You will have to wait for me for many years."
With her memories stirred by that human boy, Grayfia left the group returning to the Underworld after the meeting concluded.
She came to this place.
The place where she had spent the longest time with her Master in that world.
Less than two days later, the human boy she felt guilty toward found her villa.
And spoke the words she had just heard.
"Grayfia, I'm coming for you."
The aura radiating from him-
It was identical.
Exactly the same as her former Master, the human Lucifer named "Hiro."
Thoughts surged.
Grayfia rapidly pieced everything together, connecting the human boy named Nanamiya Hiro with the human Lucifer named Hiro.
Since you met a younger version of me in another world after meeting me...
Why didn't you explain everything clearly before we parted back then?
Why did you leave in such a hurry?
Was there something about Grayfia's service that displeased you?
Judging from his final words at their separation, Hiro clearly understood the cause and effect.
Yet from beginning to end, he never explained it to her.
That left Grayfia feeling quietly helpless.
As for anger or resentment-
Those were not emotions a maid should hold toward her Master.
If that's the case-
Now that I have a Stand, I'll be able to fulfill all of your requests perfectly, Master.
With that thought, Grayfia-having fully understood the young man's identity-stepped back two paces.
She slowly bowed.
When she spoke, her voice was even more respectful and perfect than it had been two thousand years ago.
Or rather-
Yesterday.
"I have been waiting for you for a long time, Lord Hiro."
Any inner excitement was something to be concealed.
Never displayed outwardly.
A perfect maid would not allow herself such indulgence.
That was one of the lessons from Grayfia's training.
So she really is judging my identity by "Lucifer's Spiritual Tier," huh?
"Mm. You've had it hard, waiting for me all these years."
Hiro studied Grayfia's face closely.
She seemed to have matured noticeably overnight.
After a moment of thought, his expression grew slightly serious.
"As your Master, I've decided to reward the maid who flawlessly completed her mission."
"So, Grayfia."
"What reward do you want?"
"A reward... is that so?"
Grayfia folded her fingers together, resting them beneath her lower abdomen.
Looking at her Master's serious expression, she pondered in silence for several seconds.
Soon, she arrived at a reward she had longed for for nearly two thousand years.
One her Queen, Elsa, had also longed for for more than a thousand.
"In that case..."
"I hope Lord Hiro can grant me the elimination of sound."
Hiro: ...
He blinked twice, looking at the silver-haired maid standing a meter away, her expression solemn.
For a moment, he was genuinely confused.
Is this a reward you're asking for yourself?
Or one you're giving to me?
"Are you sure?"
After a brief silence, Hiro confirmed.
"Yes."
Grayfia answered without hesitation.
Her eyes remained respectful.
Serious.
"Grayfia has awaited this day for many years."
"I ask Lord Hiro to grant my wish."
"Granted."
The corner of Hiro's mouth curved upward.
He stepped toward Grayfia.
When a girl like Grayfia offers herself willingly-
Only a fool would refuse.
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