"Reincarnating as a devil or an angel doesn't have much use for you right now, other than increasing your physical strength."
"As for the specific ability of your Sacred Gear, you can have Grayfia or Koneko help you test it later."
Since Hiro already knew that [Soul Materialization] did not bring the side effect of "inability to grow," he was naturally generous toward Yasuko Nanamiya, Midori Kirigaya, and Kirigaya Suguha.
After confirming their "true intentions," he strengthened all three of them.
As a result, Kirigaya Suguha becoming more delicate was completely normal.
Meanwhile, Midori Kirigaya and Yasuko Nanamiya-both housewives-grew younger and younger, even showing signs of gradually resembling Kirigaya Suguha's older sisters.
In addition to them, aside from Tearju and a few people he wasn't very familiar with, Lala, Rias, and the others had already undergone Soul Materialization under his hand.
This directly elevated Rias and Akeno's strength from High-Class to Ultimate-Class.
However, since they had not yet received official promotions from the devil high-ups, their ranks were still classified as High-Class Devils.
"Grayfia-san... and Koneko..."
Kirigaya Suguha tilted her head slightly.
"Can't you do it, Onii-chan?"
Her small face was full of confusion, clearly curious as to why he hadn't included himself.
"Me?"
Hiro recalled the scene of Kirigaya Suguha swinging her katana at him-only for it to fail to leave even a white mark.
He shook his head, smiling helplessly.
"I really can't."
"Because of personal reasons, weapons like swords or katanas don't have any effect on me. Testing would be meaningless."
The detailed explanation of [Authority of the Sun: Leo] was not simple defense or resistance.
It was "immunity" and "reflection."
In other words, even if he stood completely still and let Kirigaya Suguha strike him with her Sacred Gear, the most likely outcome was that not only would there be no damage, but even the Sacred Gear's special effects wouldn't trigger.
Under those circumstances, testing was impossible.
"Weapons don't work on you?"
"Onii-chan is amazing!"
The eyes of the thirteen-year-old girl sparkled.
They were filled with pure admiration and worship, like a young girl gazing at a national idol she adored.
As someone who had just stepped into the inner world and could be considered "inexperienced," Kirigaya Suguha's reaction was no different from that of an ordinary girl.
Perhaps this was because, unlike the original timeline, she hadn't experienced repeated separations of life and death.
"No matter how amazing I am," Hiro said calmly, "I'm still your Onii-chan."
He looked at the girl standing in front of him, whose face had subtly flushed.
With a gentle smile, he reached out and ruffled her soft black hair.
Then he stood up.
"No matter what happens, you're my irreplaceable family."
"If you run into trouble, just rely on me."
"I can't say I can solve every problem in the world."
"But at the very least, I'm confident I can easily deal with most of the difficulties you might encounter, Suguha."
That much was true.
For someone like Kirigaya Suguha, who had only just awakened a Sacred Gear, there were very few things he couldn't handle-aside from the looming issues between factions.
With his numerous and flashy abilities, he was practically an all-rounder.
The only real weakness was the lack of a dedicated space-teleportation movement ability.
Even so, his Observation Haki, with a range exceeding two thousand kilometers, was already more than sufficient on Earth.
Although he could personally test Kirigaya Suguha's Sacred Gear by temporarily removing [Authority of the Sun: Leo], there were plenty of ready-made testers in the house.
He didn't need to do it himself.
More importantly, if the testing dragged on too long, Rias and the others might start misunderstanding his relationship with Kirigaya Suguha.
"Oh... ohh."
Kirigaya Suguha stood up as well.
She followed behind Hiro, silently trailing him toward the door.
Family...
Family, huh?
So in the end, I'm still just family.
Different from Rias, and from Xenovia-san.
Her gaze remained fixed on the figure less than a meter in front of her.
That back wasn't particularly broad.
Yet it made her feel inexplicably safe.
A back that seemed to carry countless secrets and unseen burdens.
Kirigaya Suguha's thoughts were tangled.
She understood that she and Nanamiya Hiro were not blood-related siblings, but cousins.
From a legal standpoint, that relationship was entirely permissible.
And it was precisely because of this fact that certain thoughts within her continued to grow stronger.
What I want... isn't this kind of family.
Because he had never used Psychological Control on Kirigaya Suguha, Hiro was naturally unaware of the complexity of his sister's feelings.
Over the next two days, he and Grayfia traveled through various mythological systems.
Yet they still failed to find any trace of Cao Cao's group.
The only gain was capturing Katerea Leviathan, who had escaped from Sirzechs during the Three Factions Conference.
Along with her came a completely useless reward.
God-Level Cooking Skills.
Heaven knew why a Fifth-Tier Luck would produce something like that.
Of course, out of a desire for both compensation and utility, Hiro didn't simply kill Katerea Leviathan.
The dark-skinned young devil girl was instead put to use.
In a way even less valued than his subordinates, Jeanne and Walburga.
(It's understood. No need for further explanation.
After all, she's just Katerea.)
Because of news from Koneko that the Yuuki sisters would be visiting, Hiro didn't take Grayfia or anyone else out to hunt for Luck that weekend.
Instead, he stayed quietly at home.
Waiting.
Waiting for the arrival of another pair of sisters.
"Big Sis, Big Sis."
Mikan Yuuki looked up at the luxurious upper levels of the castle in front of her.
Her face was filled with disbelief.
"Is this really the 'ordinary family' home of Hiro-kun that you mentioned?"
"Are you sure you didn't get the address wrong?"
"The address is definitely correct."
Asuna Yuuki wore a slightly awkward smile as well.
"Maybe Hiro-kun moved."
"Either way, let's ask first."
She raised her right hand and pressed the doorbell.
Ding-dong.
Hearing the chime, Hiro put down the news notification about "Brain-Eating Worms."
He waved off the Head Maid's attempt to move ahead of him.
Then he stood up and walked toward the castle gate.
Click.
The door opened.
Two chestnut-haired sisters who looked quite similar-
And a girl with a full head of green hair-
All entered his field of vision at the same time.
"Yo."
"Long time no see, Asuna, Eto."
"And nice to meet you, Mikan-san."
Hiro chuckled as he greeted the three girls.
His gaze lingered slightly longer on the unfamiliar green-haired girl.
Her face was inexplicably red.
...What's going on?
Don't tell me this is love at first sight?
Hiro muttered inwardly as he stepped aside, ushering the three of them into the castle.
(Suguha's age setting: In the original work, she's flat at twelve and quite developed at fourteen. In this book, assume her development is one year ahead.)
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