I'm his uncle?!

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(So the results of the poll were pretty clear. I'll be going for 2500 words daily if nothing urgent comes up. -Reili)

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[Journey in the animeverse part 2: Irregular at a magical high school.

Task: Introduce and teach the more effective and efficient type of magic.

Restrictions: Must become a teacher at First Magic High School, must teach for a minimum of 5 years, must make sure your name goes down in history, must make sure you teach MC Tatsuya new knowledge.

System God notes: I know how much you love being docile so here's another mission. Don't worry there'll be some action later since you know how the plot goes. However, do you think I'll really let you appear near when the plot starts? 凸ಠ益ಠ)凸!!

Rewards: Passive skill - God Tempered Body Part 2/?]

"Holy fuck are you serious?! I have to be a teacher now!?" Rei cried out seeing the panel.

"A teacher? Master what do you mean?" Fey asked looking at Rei.

"It's my mission in the next world. For this world, I had to redirect its fate into a better one. For the next, I have to become a teacher and teach new magic to the world." Rei explained as he dismissed the panel.

"I don't see a problem with that." Fey asked unsure to why Rei is unhappy about it.

"It's not that there is a problem, but rather I'll have to teach people for at least five years not to mention the kid I told you about. The one who can store and activate his powers." Rei said as they walked.

"And now here comes the main issue." Rei said turning around.

"I have no fucking clue/understanding of the magic system. How do you expect me to teach a revolutionary magic that will work in that world when I don't understand it?!" Rei cried out in annoyance.

"Then master can't you redirect the world laws to fit your criteria better?" She asked.

"I could, but that will have more implications. It also means that the powers they have will become different." Rei replied shutting down the idea.

"Although.... System, analyse magical laws of the world and compile it into a book for me. Also included existence plane composition, balancing laws and mana transference laws." Rei instructed as a book started to form in his hand.

"Master, I've heard you talk to this system and give others a system but what is it?" Fey asked.

"It's something that helps me while I help it. Think of it like a helper that assist me much like you." Rei replied offhandedly as he started to read the book.

"Travelling to the world will take a little longer since the world is in the middle of science and fantasy. We'll have to travel quite a distance to reach that. In the time I'll be understanding the laws of the world and you should too." Rei said as he made two comfy sofas.

"It's fine, I'll be content just watching master study." Fey smiled as she sat on the sofa and hugged her legs.

"If you say so, I'll leave a copy of the book there so you can read it when you want to." Rei said as he sat down and crossed his legs. Opening the book with his right hand, Rei rested his head on his other hand.

Whilst he was reading, the surrounding flashed by as countless planets of different worlds and solar systems appeared and disappeared.

Fey kept watching the serious Rei with a smile.

It took a month before Rei finally finished the book.

"FUUUUCCCCKKK!!!!! I, yours truly, have finally understood this magic system!" Rei shouted out as he flung the book as far as he could. Fey was sure she saw the book lit up aflame from the speed and become a meteor before blowing up a planet.

"Er master?" Fey asked with a sweat drop.

"*cough, I'll fix it." Rei faked a cough as he reversed the time of the planet to before his book destroyed it.

"So basically, the magic system of the world is similar to how people would code games. We have the information plane of existence and the physical plane of existence. The two planes are connected and whatever happens to one plane effects the other. When a magician uses magic, they overwrite the data in the information plane which then effects the existence plane. Let's say they want to fire off a ball of fire. They would rewrite the information to a series of numbers and codes for fire. The speed of which people actives magic is determined by how fast they rewrite the codes." Rei explained as Fey nodded even though she didn't understand.

"In order to rewrite these codes, they need to have 'Ink'/mana/psions. Everyone has a number of psions under their control even the normal people. The magicians are those who are able to pick up a 'pen' and use the 'Ink' to rewrite the data." Rei continued.

"This is where the individual Tatsuya Shiba excels everyone in. Instead of picking up a pen and writing the data, he makes a stamp of every spell he knows and when he needs it, he just stamps it in the information plane. Large spells, small spells everything is activated instantly." Rei smiled as Fey understood.

"If it was that simple why did master take a month to finish reading it?" She asked.

"That was the simplified version. I had to read about the effects, the counter balance and a lot of other laws that effect the world for each simple spell.

"But with master's arsenal of spells wouldn't it take a long time to find the right 'stamp'?" Fey asked as she tilted her head.

"Yes, which is why I have a theory. Once I copy his skill, I'll be able to classify the effect of each spell into different sections. So instead of having to search through every spell I constantly deconstruct and construct new spells the moment I need them." Rei replied standing up.

The scenery had already stopped as they reached their destination. below them was Earth in all of its glory.

"Let's go." Rei said as he opened a portal. Both him and Fey walked through causing a blinding white light to cover their visions.

[System God background settings activated.

Name: Rei Yotsuba

Gender: Male

Age: ??

Background: Brother of Miya Shiba/Yotsuba (Mother of Tatsuya) and Maya Yotsuba (Aunt of Tatsuya). Unknown prodigy in the study of magic. Went overseas at a young age thus creating a detachment from the family. Main focus in life: The study of magic and passing his knowledge onto the younger generation. Returned after finishing all of his magical related research.

Name: Fey

Gender: Female

Age: ??

Background: Orphan. Taken in by Rei Yotsuba as a personal maid during his times overseas.]

"Fuck! Not only am I a teacher of the kid but now I'm his uncle too?!" Rei cried out seeing the settings.

"Don't mind that master since it will make it easier and quicker for you to obtain his power." Fey replied as she stood behind him.

When the light died down, Rei found out that he was in a private aircraft landing in japan.

Stepping off the plane and walking through the airport, Rei found no one of the Yotsuba family there.

Going through the setting that the system had created, Rei realised that his return was kept a secret and that everything he needed was already prepared. A house, passports and other necessities.

"Come Fey, we're going to our new house." Rei said as they left.

Even though they were quite far away, Rei and Fey decided to take a relaxing stroll.

"Master, I still can't believe the future is like this. It's just so.... different." She said seeing the houses.

"As time goes on, most people will be looking towards efficiency as well as a compact design. Thus, designs like this will become the new common." Rei replied as he looked around for their house.

Standing in front of the house, Rei felt like it looked familiar but couldn't but a finger on it.

Walking inside, Rei could see that everything was prepared already. In addition to this, a figure was sitting on the table drinking tea.

Rei frowned slightly.

"Finally returned after so long and you don't tell your sister about it? So harsh." She said with a smile. Sitting in the chair was Maya Yotsuba. The aunt of Tatsuya and the supposed 'sister' of his current identity. She had long dark purple hair and purple eyes. Wearing a ball room dress of sorts, she sat in a refined position.

"No use telling you. You'll find out eventually." Rei replied as he sat down opposite her. Fey stood behind him and kept quite since she knows Rei will handle this.

"Oh my~ gone for so long yet so cold to your sister. If I wasn't sure it was you then I'll probably think it was a stranger." She smiled.

Before Rei could reply she cut him off.

"I know, I know. So long away from the family, no connections. Plus, a lot of us have already been modified so it's not like we can feel strong emotions to begin with. I just wanted to see what my brother looked like after so long and I have to say. White hair, not bad." She smiled whilst standing up.

"If you want the Yotsuba family to monopolise my research then you can forget about it." Rei said as his task was to spread the knowledge around and make a name for himself in history.

"I don't plan to since I know what you are like. Well brother, I'll leave you be." She smiled as she walked out of the house.

'Thank god for my acting skill I copied. At least I'll be able to act the way of a detached brother convincingly.' Rei thought. Feeling tired from understanding the magic laws, Rei felt like taking relaxing bath.

"I'll go for a bath Fey, are you able to make the water hotter for me?" Rei asked as Fey nodded.

Sitting on the table, Rei had a look at the virtual notebook and decided to start making notes on what he wants to teach. Since it was his quest to make his name go down in history, he would need to make some earth-shattering discoveries.

"First, types of magic I can use. External can be classified as elemental and non-elemental. Internal can be classified as reinforcement and self-healing. Domain type spells are their own category. The world already has the basic forms of External and Internal magic. As for Domain type they don't have the 'full' domain type spells it yet so I should make some formulas for them." Rei said while he wrote everything down.

"To make a Domain type spell through interfering with the information plane...." Rei muttered as he thought.

'If I were to change the data to which I can control in a sphere, then it'll be more of a glass orb. I can tell when something enters but I won't be able to tell anything that happens inside. If I did it like how my domains work, then it'll be too much information for people to process and could turn them into idiots.'

'Wait hold on... If both planes are directly connected, then If I were to shift the data and real around. Wouldn't I be able to enter a separate space with a lower cost and a more efficient speed whilst still appearing in the real world?' Rei thought as an idea appeared in his mind. The idea surfaced whilst he was thinking about how the domain would affect both the information and the reality.

"To switch the data around, I need to make a mask that makes the real objects seem like data. Which will then automatically send it to the information plane. In order to fill the gap that appeared, the data would switch places with the real due to their being two copies in the same location. However, it cannot convert itself into a 'real' due to the actual object still in the information plane so what remains is a hologram." Rei muttered as he started to jot down the details and sequences of the spell. This spell will require a high level of control or else the spell would fail to activate. And this was the best-case scenario, if they failed to write the sequence properly mid-way, the spell would sever whatever they picked and kill it.

Example being if a person tried to only send their right arm into the information plane and failed the sequence. The arm will switch places but be completely severed from the shoulder and return as disconnected atoms. The result will disintegrate the arm completely. However, with the sequence Rei wrote down. It would revert the object to before it was relocated after the user brought it back from the information plane. The arm would be unaffected.

"Did I just create Kamui from Naruto using magic of this world?" Rei muttered seeing the finished concept.

"Mn, let's try it. If it works, it will be more powerful than my mist form. I'll be essentially invulnerable." Rei muttered as he activated his sequence just on his torso.

"Oh fuck." Rei suddenly said as his limbs and head 'fell' off his torso. There were nothing connecting the data and real so they'll fall through each other.

Undoing the spell, Rei reverted his body as he had to do some more corrections. It took a while longer as Rei had to try perfect the spell. He had to make sure it couldn't be directly affected or cancelled by an outside interference. He had to also make sure he didn't just fall through the earth whenever he did it.

In the time it took for Fey to finish preparing the bath, Rei had created three new types of magic. One which made him invulnerable, one which 'deleted' data and one which transferred data from location to location. All three were based on the same concept.

"Master I've finished preparing the bath." Fey called out as she saw Rei close a note panel.

"Hug me." Rei said as Fey wondered why. Even though she wondered why, her body shot forward not giving Rei a chance to go back on his word.

*Crash!

her body fazed through Rei's as she crashed against the sofas.

"Huh? Wha?" Fey looked over at Rei confused.

"Master why can't I touch you?" She asked.

"It's a new magic I've developed. In a nutshell, unless I will it. Nothing can touch me whilst I'm in this form." Rei smiled.

"Oh my god!" Fey cried out and ran towards Rei. Waving her hands through him, she couldn't believe what she was seeing. His aura was there, his presence, his mana everything. But she couldn't touch him.

"It feels like you're here but at the same time you're not here." She said in surprise.

"It was harder than you think. It's also not practical just yet." Rei sighed as he revealed a densely packed page of sequences.

"I have to 'write' this down every time I use this spell. The time it takes to do this is 5 seconds. It takes too long and unpractical during a fight." Rei said as he made himself 'real' again.

"But once I make a medium or Tatsuya's ability. I'll be able to use this instantly." Rei said as Fey nodded.

"Does master have a name for it?"

"Hmm... I'll stick with the name which I took inspiration from." Rei smiled.

"Kamui."