I approached her and gave her a bottle of water that I had taken from my inventory when I began to enter my dimension. I was always hungry, so I had to leave many things in my inventory, nothing was damaged because time seemed to stop.

Yukio: "Well done, I'm surprised you managed to complete the round in one day" What I said was true when I started doing it almost dying of exhaustion

Rías took the bottle of water with an angry look, she felt exhausted because of this barbaric training.

I did not care about his look, I shrugged before speaking with Grayfia.

Yukio: "Grayfia, I'm going to start the mana training," hesitates a little, but speaks. "I'm going to use a skill to help her. Could you wait for a little?

Grayfia was confused, she did not understand exactly what it means, but she trusted Yukio, so she just smiled.

Yukio: "Have you rested? I need to start your mana training."

Rías: "You... Is that how you treat girls?" She was furious as soon as she caught her breath, but now she wants to start again.

Yukio: "Does that really matter? I have to go home soon" It was true after all it had been an hour since he left school and his parents would worry if he did not come back soon.

Rías: "Hummp! Let's start" Bufo with anger, he couldn't stand this child, and he only met him twice in his life.

I approached near Rias placing my hand on his shoulder before he could react appeared a small white hole that swallowed us both knew Grayfia would be worried so leave a few words behind "Grayfisan we'll be back soon"!

So we disappeared as if we had never been there, Grayfia was confused trying to feel our presences but it was as if we didn't exist.

Grayfia: "Yukio-kun... You should at least explain things to me before doing them *Suspiro*" He rubbed his forehead while thinking about this child...

----

Meanwhile, Rías was trying to get up while she was kneeling on the floor, she couldn't even lift her head just listening to Yukio's voice.

Yukio: "You'll have to stop the pressure and concentrate on a.s.similating the manna in the air when you do you can move again"

We moved to my dimension because when I was planning to create a house, I discovered a place where the manna is too intense at first, I got confused because there was such a place, after inspecting I found a black hole.

I did not enter because I could feel presences with great power on the other side, so I left it for when I became stronger.

I sat on the ground while looking at Rias, noticed he was stabilizing, a.s.sumed he was releasing his 'destruction' after all in this place I didn't have to hold him.

Rías: "P ... what is this place?" I ask, clenching his teeth trying to get up with all his might.

Yukio: "You could call it a special ability, you should concentrate on the training if you want I can explain it to you later

Rias nodded, wanted answers, but had to take advantage of training his mana in this place, he felt free to reject all his mana even his destructive power, he just managed to sit down and closed his eyes while trying to get used to the mana in the air.

After about thirty minutes he could get used to it, opened his eyes and began to check the place where he was, it was really beautiful, there were several herbs growing and a blue sky without clouds having a black sun was strange but dazzling.

He fixed his gaze on the boy in front who was writing on a laptop and felt curious therefore approached.

Rías: "What are you doing?" I watched and could understand that it was a kind of story, his eyes lit up as he continued reading "Is that a novel?"

She was impressed even though it was from the underworld that she still liked Some human things.

Yukio: "You get used to it fast, that's good, let's start your mana training" I did not answer because I did not feel like telling him what I was doing, after all, I barely knew her to let her know what I'm doing.

Rías clicked his tongue because I didn't respond, but she still nodded to start training, she had already realized that she could become strong if she followed this child's advice.

Yukio: "Sit down and try to gather mana around you when you think it's enough to take this pill, I advise you to go through every part of your body".

Rias took the pill in his hands and reviewed it, it was the pill that his older brother had taught him before, so he knew its effects he sat obediently and began to gather the manna around him.

To his surprise it was very easy, he felt that he could completely control his power of destruction, at least to be in this place where he felt free when he thought it was enough to quickly swallow the pill, he felt something warm explode in his abdomen when all the Mana in the air was attracted to her in a typhoon, this was better than what her brother had said, they had only said that the demon managed to increase her mana by a third, but this was different, she felt that it would explode.

When it almost gets out of control, I listen to Yukio

Yukio: "* Sigh * I will not let anything happen to you, you just concentrate on moving the manna to every part of your body, to help you absorb it."

Yukio treated her badly, but her words a.s.sure him that he will not let her get hurt, so he concentrated on doing what he said.

---

He spent almost an hour quickly and Rias was sweating all over his body with a pale face, he was mentally and physically powerless almost on the verge of unconsciousness, but he bit his lip to hold it.

Yukio: "Well done, you have managed to absorb half of what you put together, I can say that you are now with enough mana, so rest and then try to control it if it is likely that you are not a time bomb".

She nodded palely, was exhausted and just wanted to leave, saw the boy walk to the front and showed him a pill. "Here, this pill will help you recover physically."

He swallowed it quickly and his body regained its color, but his state of mind was truly a disaster even, so he rose a bit staggeringly.

When I saw her like this, I hesitated a little but it was better to do it "Do you want to become strong?"

Rías: "Strong? If not for that because I would be here," she replied tiredly.

Yukio: "No, I don't mean that, why do you want to become strong?"

Rías contemplated a moment but raised her head with determined eyes: "Because I want everyone to know me by my name, I do not want anyone to decide my destiny ... I do not want to be a puppet"

The last part he said in a low voice but I could hear it clearly I smiled a little, then I looked at it a little.

Rías: "What? Is there a problem with my ideas?"

Yukio: "Not at all... Do you want me to help you?"

She was confused, "Aren't you helping me right now?"

I shook my head as I looked at it again with serious eyes "I plan to help you become strong but for that... You must promise to keep the secret..."

Rías was speechless, understood that he planned to help her in the truth, but it must be a method that does not want anyone to know, so she felt something complex, on the one hand, she had to lie to her family and the other could fulfill her dreams.

Even so, she made a decision and to fulfill her dreams, she has to sacrifice something. Yukio did not show any bad intentions towards her, otherwise, she would have been killed as soon as they entered this place.

Rías: "I promise, I promise not to tell anyone about Sensei's methods."

I was a little stunned. Sensei? This is new but I soon chuckled as I pulled out a piece of writing paper that I had made when Rías was taking the pill.

Yukio: "This is a contract, here place your name along with your blood... You should read the consequences of breaking your word."

Rias took the paper and began to read it when he made his beautiful face turn pale, what was a contract called "Contract of the soul", the clauses said that if he broke his word, he would die immediately and anyone with the slightest information due to her.

Rías: "Se-sensei this...? Isn't it too much?"

Yukio: "Ah? Well, if you don't plan to betray me, nothing will happen to you. Why so much fear?"

Rías even if he did not plan to betray him, but he still feared that by chance he would drop something and end up dying ... He still gritted his teeth and signed the contract when he cut off a finger with his fingerprints in blood.

I smiled at her when I saw her do that, that paper was not really a contract, it was just a simple sheet ... If I cheated on her, but how could I tell her I had techniques, even if they were not against me, what? What would happen if I told you that I can strengthen them to make sure they would take something away from me?

I saw her shaking and I think I exaggerated a little but I took the contract and stored it in my inventory.

Yukio: "Hey you shouldn't be like this, it's not like I'm going to kill you now"

Rías: "You say it so easy! I could die if I happen to slip something!"

Yukio: "Hehe but you wouldn't do it, would you?"

Rías was furious and clenched her pretty teeth in anger, staring at me like a beast.

Yukio: "Do not get mad, come on, I'll show you the method." He approached me and placed my finger on his forehead to convey a technique I bought at the store.

[Mana Control] — Ability that allows the wearer better control over the mana in his body

Rías felt a lot of information in his mind and along with the previous tiredness could not bear it anymore when he collapsed.

I took her quickly in my arms I knew she was tired and it was time to return to a white hole was opened swallowing us again appearing in the same place, I had Rías in my arms unconscious.

Grayfia was worried but soon a white hole sparkled and appeared again but this time Rías was unconscious in Yukio's arms, he raised an eyebrow before the child.

I innocently smiled at his gaze, "In my defense, he just fainted."

Grayfia: "You don't have to worry Yukio-sama" took Rías in his arms and gave him an inspection and was surprised to see that his mana increased from a simple house to a medium-sized building.

Yukio: "I'll go Grayfisan... don't forget our deal" I started running

Grayfia looked at the boy's back and smiled and really felt like it was his son, meanwhile, Yukio only had one thing on his mind.

Yukio: "My parents are going to kill me..."