"I have read a lot of different books about anatomy and I'm sure you too, I think you're perfectly aware about the organs and muscles, such as the heart, and of course, the brain" Arima started speaking "I will talk about the brain for a moment. n.o.body knows all the mysteries contained in it. But the brain is of course the most important part of our body. Some also say that it is where the soul resides. Well, at least, we can be sure that it's our spirit and mind" He said

"The brain controls and manages our body without us even knowing about it. We can't use our brain; we should say that the latter is helping us. Now, the reason I'm telling you this, is because the brain is doing something to your body since birth" Arima declared and his students became seriously curious.

"From where I come from, people started saying we could only use ten percent of our brain capacities, then after that, they said that it was wrong or whatever" Arima said with a fed-up expression "But, there's one thing that is sure, it's that we can't fully control our brain, that's a fact. And then, the thing that the brain restrain since birth is our physical-output threshold" He then said.

"Our body usually can only use around 50% percent of its total strength because of the brain. Of course, that's because if the body forced beyond that limit, it could destroy itself in the process. Actually, you can withstand 100% of your strength if your body is strong enough" Arima explained and then smirked "After, if you can go higher what would happen? 120%? 150%? 300?" He asked and the people in the room started making their imagination work.

The more they thought about it, the more shocked they became. If it was true, then even if they had to suffer injuries from the downside, it was more than just worth it.

Arima also ill.u.s.trated everything with the projection, the figure pictured had his muscles suddenly contracted, his heart beat raised along with his blood flow "That's one hundred percent" Arima commented.

Then, after that, the figure's muscles contracted even more and even the organs started to tighten and the body temperature also raised "Around 125%, and let's stop here" Arima said "From what I tested, this limit break also includes the maximum limit of mana you can concentrate at once" He declared and as he said it, a blue glow flew through the veins in the projection and then it started expanding and totally recovered the figure, it even exited the latter's outline.

"Well, if you try to reinforce your body then punch in that state" Arima paused and snickered "Say good bye to your hand. Make sure to think through it before using it, I recommend you to only use 100% while training"

The students strongly nodded and just after that, light illuminated the room.

"That's all, tomorrow, I'll bring you all to train outside, and then I will be able to guide you" Arima said "Now, it's time to leave the place for the next period"

After that, Arima continued to teach about the physical enhancement at each of his cla.s.ses. At noon, he decided to eat at the cafeteria of the school. There, he found out that the food served was really good, and if he didn't know better, he would say that it was really expensive.

"As expected of the biggest school on the planet" Arima smiled and looked at his meal. He was eating with Lanya and Night at a table. There was no one else, not that people feared them, but more like they weren't courageous enough to approach and talk to them.

"h.e.l.lo, again" Then a voice resounded in Arima's ears while he was eating his pasta. He looked up with his mouth still full and saw Velvet looking a him with a smile. He quickly swallowed and looked back at her.

"Yes, h.e.l.lo" Arima answered with a polite smile and Velvet's expression twitched.

"(If you are so polite, why did you leave me like that this morning?)" She complained in her mind. She put down her tray on the table and smiled at Lanya "I hope I'm not disturbing your meal"

"No, it's okay" Lanya shook her head and replied. Night had also a meal for himself and was eating on the table, he glanced at Velvet before resuming to eat.

Velvet looked at Arima and then snapped her fingers, she created a sound proof barrier to keep this conversation private.

The students around were looking at them in wonder. Trying to think about what they were talking.

"I'll be honest with you. You said that you will raise a cla.s.s to partic.i.p.ate in the ranking compet.i.tion, right?" Velvet asked with a serious expression. Her expression had lost most of its gentleness and her words were more familiar.

Arima looked back at her "Yeah"

"In that case, I'm sure you know that the compet.i.tion takes place with combats, between students of each cla.s.s partic.i.p.ating. But at the end of that event, the representative teachers will also compete against each other. I want you to step out from that last part" She explained "I'm sure that I can't beat you, I heard rumors about you, that you fought with the Demon King Raal Zalda and won. Also, apparently, from the princess herself, your soul beast is strong enough to threaten this city"

Arima was bit surprised, this woman's forced gentleness and politesse wasn't mean or anything. She was just like that, and was trying to hide it in public. Her, revealing it to Arima, was the same as proving that she was honest.

Arima stared at her for a moment, making the latter awkward "Fine, I never intended to fight in it any way" He answered.

"Huh?" Velvet was genuinely surprised "Why?" She asked.

Arima smiled and patted Lanya beside him "It's her who'll fight at my place. She still needs some experience" He said

Velvet stared at Lanya "She's only at the late ninth level, although I'm just at the early tenth, there's still a huge difference" She declared.

"Yeah, but don't worry, she has an inheritance, she is on par with you" Arima casually answered. Velvet's eyes widened and a flash of surprised flashed in them.

She looked one more time at Lanya before nodding "Fine, if it's like that, it should be fine" She said and stood up "I wish for a good compet.i.tion" She said and left.

"…I'm going to fight?" Lanya asked after a moment of silence and Arima started laughing.

*******************************************

At the end of that day, the information about Arima's lecture spread into the whole city. Everyone was surprised by the limit break technique. But what shocked them the most was about the Soul Contract that Arima created.

The magic circle he had given to his students landed in the hands of many people already. And there were also some idiots that tried to contract to more than one creature's soul. After their deaths, n.o.body ever tried again. People always need a definitive proof to stop doing something.

When the Royal family heard about that, it was without saying that it shocked them to the core. When they thought about it, they knew nothing about Arima, he just appeared from nowhere a few months ago and that was the first time someone ever heard about him.

And, now, this guy casually gave away those techniques that seemed to be ahead of their time.

Since that day, that planet started changing, the Soul Contract began to spread around the world and people's strength skyrocketed. And it was also heard that a dwarf had created innovative machines with something that he called steam power, which brought a large change to the world once again. There was also Raal that remembered Arima's strange weapon and decided to try create something that looked like it, which then became a phenomenon.

But all of this, is part of another story.

****************************************

The next day, at every period, Arima brought his cla.s.s to a barren land to serve as a training ground. There, he taught them how to break the limit established by their brains.

It was actually pretty simple, in a world of magic at least. You just needed to interact with your brain with mana and then create a sort of telepathic link. That link being a soul magic impulse, basically ordering the brain to cut the limit until a certain extent. At first it would hurt a lot, but it would disappear with time.

While Arima was teaching them, he also realized that some of his students already had used the Soul Contract. Some of them directly left to hunt some beasts yesterday.

The power level in this academy, was around the fifth level and below. The strongest were around the sixth of seventh level. So, most of the students that went to kill a creature to take its soul only managed to kill creatures below fifth level most of the time.

But the level of the creature they killed wasn't actually important, after all, the strength of the ability they gained afterward would be able to grow with them. But you at least needed to choose beasts that could give you some useful abilities.

For example, if one lacks in defense, he should contract with the soul of a creature that had a very good one.

While thinking that, Arima glanced at Ofia and smiled. Yesterday, she looked still pale and weak but here she was, training with her physical strength.

Yesterday, when she got the Soul Contract, she directly used her influence to get herself a live c.o.c.katrice. c.o.c.katrices were really rare and although they were really dangerous because of their eyes. If one was prudent enough, it was easy to kill one, since they were only around the fifth level too. The reason why Ofia chose this beast particularly, instead of another beast of a higher level, was because in this world, c.o.c.katrices possessed a really strong regeneration ability.

Thank to that, she healed her weak body that held her down for her whole life. She was the perfect example of how using the Soul Contract correctly.

The same day, at the last period, when everyone was about to leave.

"Teacher" Isla suddenly called Arima with a slime.

"Mh, do you have question?"

Isla shook her head "No, I just wanted to ask teacher a favor"

Arima frowned and tilted his head "What is it?"

"Since you've been teaching us like that since the beginning, we've not been able to see your strength. Could you show us how you use the strengthening magic to the maximum?" She asked.

Arima looked around and saw that everyone was staring at him with expectation "Fine" He shrugged and said, his sigil revolved once and they were instantly brought into another dimension.

But no one realized that, except Arister, Lanya and Night. And maybe Ofia who felt something was strange.

"You should get away" Arima said and snapped his fingers, everyone was teleported away. They reappeared in the sky and kept hovering there, thanks to Arima's magic.

"Eh? Is that much precaution needed?" Isla exclaimed.

"Oh, yeah" Arister said "Without a doubt" And Lanya followed.

At the same time, Arima breathed in and out. He took a combat stance and brought his fist to the waist.

"[Herculem corpore] (Hercules body)" Arima chanted and his body grew a bit taller and bigger.

"[Terminus confractus, C] (Limit-break, 100)" His muscles contracted and the air started enveloping him each time he made a small movement. Some steam started coming out of his mouth at the same time.

He then clenched his fist and swung it in a strong and fast motion toward the ground. It was less that a millisecond. Arima stopped his fist just before it could touch the ground.

But after that, a shock wave struck the ground and instantly crushed the earth and stone, then created a mile wide crater. The earth started shaking really strongly. The crater just continued becoming deeper and deeper, like something was slowly pus.h.i.+ng.

The wind produced by Arima's fist even reached his students that were in the sky. They were blown away but the magic making them float didn't stop and made them stay in midair.

When they stabilized and looked down at the ground. Their eyes widened to the maximum and their mouth opened.

What they could see was only Arima standing in the middle of a giant crater. The latter created, just by Arima's physical apt.i.tude.

"…I-Impossible, how could a human have such a strong body?" Ofia muttered and Lena who was beside her, was almost trembling in fright because of the scene. And even Irian, who was a physical strength addict, couldn't believe his eyes.

Arima breathed out some steam and looked at the sky "Is it good for you? Isla?" He asked with a smile.

Isla laughed wryly "...Yes, it's perfect" She responded and looked around, to only see crushed earth as far as the eye could see.