After finishing his morning exercise, Arin personally took Aeka to school.
Although she was a mage, for someone her age, it was better to interact more with peers and enjoy youth and life.
According to Arin's understanding from Fate/stay night, even mages, a group not bound by worldly common sense or morality, usually integrated into normal society, like Rin Tohsaka.
This also aligned with his perception of Japanese students.
Even saviors of the world, or allies of justice, still had to go to school when it was time.
Aeka initially had strong objections to this; ever since they met, she wished she could be by Arin's side 24/7, trying to analyze this unique mystery and unknown.
As for knowledge, to the Princess of the Root, there were no secrets in the entire world.
The forbidden knowledge countless mages yearned for and the great wishes they dreamed of were all readily available to her, almost too much even for a pastime when bored.
There was absolutely no need for such an unnecessary act.
But age was a hard limit, especially for Arin, who had regained his past life memories.
It was already ridiculous for a child to run away from home, let alone not wanting to go to school.
Becoming a NEET princess at such a young age was no ordinary student behavior; strong measures had to be taken.
The two held different opinions, but ultimately, Arin, the cunning adult, prevailed.
In this regard, Arin felt he was a more competent guardian than Hiroki Sajyo, her biological father.
That man was overly indulgent with his daughter; no matter what decision Aeka made, he had no objections.
As for later realizing this was Type-Moon and understanding that Sajyo Aeka's identity was not simple, he might have been overdoing it.
But rather than letting Aeka idle away as a shut-in girl, it was better to let her drown in the ocean of knowledge.
Aeka enjoyed her school days, and Arin could get rid of his 24-hour shadow, a win-win situation... After returning to the bookstore, he didn't open the shop as usual. Instead, he went to the training room on the third floor. In the hundred-square-meter space, exercise equipment was neatly arranged, and the cabinets along the walls held various katanas, longswords, and other weapons.
Arin took a deep breath, struck a pose, and began to train.
When he first started exercising, Arin went to a gym as a novice to learn the correct training methods.
As a result, within two months, his changes astonished the coach, whose eyes became strange, as if saying: "Is this even human?"
His inhuman progress truly gave the coach a small shock from a transmigrator.
Besides that, moderate fitness attracts the opposite sex, but excessive fitness might not.
Therefore, once his physical fitness improved, Arin went to a karate dojo to train.
And two months later, he punched through his fellow students one by one, and his masters two by two, leaving an indelible shadow on the entire dojo. Many disciples were so disheartened that their martial arts spirit shattered, and they chose to leave the dojo.
So, Arin was sent out by the dojo master with a beaming smile, who then slammed the door shut with a bang.
They were just short of putting up a sign that read: "Arin and dogs not allowed."
At that time, Arin's physical condition already suppressed ordinary people; if he were serious, he could probably take on a dozen without a sound.
The only regrettable thing was that he didn't trigger any plotlines like a national martial arts competition.
However, as a human, Arin still had limits. Once his body reached the peak level for a normal person, it became difficult to break through further.
Therefore, he purchased professional exercise equipment and entertained himself at home. His training volume was maintained at a level to prevent his body from declining from its peak.
Anyway, the property deed for the entire building was under the name Arin, so there was no need to worry about disturbing neighbors.
Of course, compared to the Arin of Type-Moon, who was like a salted fish, the daily Arin had diligently practiced Iaijutsu for ten years, reaching the level of a great swordsman who could cut through anything.
As for now, after entering the space and sharing talents with his two other selves, the purity of this body had increased again, even capable of surpassing human limits.
Even if he couldn't compare to monsters like Servants, Tokyo wasn't Fuyuki City, so he wouldn't encounter those inhuman existences.
As for mages, the Sajyo family was in Suginami Ward, Tokyo, not far from the bookstore.
Ordinary mages shouldn't cause trouble here.
This was also the main reason he could feel at ease living out his days.
As for becoming a mage, the most basic requirement was to possess Magic Circuits. These were simulated nerves within a mage's body, paths that converted life force into magical energy.
Shirou Emiya, for example, had 27 Magic Circuits.
One of the reasons Sakura Matou was adopted into the Matou family was that Shinji Matou lacked the basic aptitude to become a mage. However, as a member of the Matou family, he still had the imprint of Magic Circuits.
Arin also lacked the aptitude to become a mage; otherwise, he would at least learn some basic defensive magic from Aeka.
He felt a little regret about this but didn't dwell on it too much.
Tokyo didn't have a Holy Grail War, so there was no need to worry about survival.
If it were a more dangerous environment, he would probably immediately struggle for survival.
As for Fuyuki… if it really was the Fate/Zero timeline, without any abilities, he would only remotely interfere with some developments while ensuring his own safety.
Besides that… Arin was not without trump cards… In the training room, Arin punched repeatedly, striking the giant, human-height sandbag, leaving noticeable indentations.
Once his condition was optimized, the reflection of a silver clock appeared in his pupils, and his body instantly hit an acceleration button.
His perception of the outside world was that everything became incredibly slow. Both his thoughts and body had broken free from their original constraints, sublimating to another level.
His already blurring punches became even more indistinct, and the speed and power, far exceeding human limits, combined to form an extraordinary qualitative change, slamming into the hundred-kilogram sandbag.
Boom!
With just one punch, the sandbag was completely burst open, sand flying everywhere, but Arin ghost-like dodged every single grain.
"Hoo ah~, compared to the stagnation of the past, there has indeed been a subtle improvement this time. The shackles of my body have been opened."
Arin exited the time acceleration state, wiped the sweat from his face, and was very satisfied with the result.
In the triple-speed state, the enhancement is far from just speed; it's an all-around improvement.
Coupled with Everyday Yalin's combat skills, as long as he is careful, ordinary people, even with weapons, would find it difficult to pose a threat to him.
Even when facing a Magician, with a prepared mind against an unprepared one... Yalin thought about Kiritsugu, Lord El-Melloi, and Tokiomi's performances in the Fourth Holy Grail War, and felt that he was being overly arrogant.
Leaving aside orthodox Magicians, Kiritsugu possesses abilities similar to his, and he doesn't play by the rules.
If it really came to a fight, he would probably have to be prepared to be showered in bullets.
However, if Aika were to perform magic reinforcement on him like Medea, Yalin was confident he wouldn't perform any weaker than Souichirou Kuzuki.
Combined with his time acceleration ability, he might truly forge an incredibly formidable combat power. Even Servants might not be out of his league.
Thinking of this, Yalin was speechless. Comparing Aika to Caster, the Witch of Colchis, was a bit too much to ask.
Based on his guess, Aika should be similar to Rin Tohsaka at the same age.
Wiping the sweat with a towel, Yalin took out a katana and practiced Iaijutsu.
Two hours later, a physically sore Yalin cleaned the training room.
After enjoying a moment of lingering satisfaction, he went downstairs to open the shop, hanging up the "Open" sign.
Although he often slacked off, closing early and turning away customers, and occasionally even refused to sell books because he was too lazy to restock.
He was, without a doubt, a rather diligent and responsible bookstore owner.