Discovery and departure to the underworld

It had already been a week since he started training Rías, at first it was quite problematic but then it was quite pleasant, what bothered him was that 'Sensei'.

As they trained he noticed that her mana control was slowly increasing, he taught her a little about the body to body fights after all she couldn't always count on magic.

--

Yukio: "For today it´s enough, we should rest."

Rias sat on the floor as she stretched, they were struggling to improve her body, he noticed her looking at him.

Yukio: "Is something wrong?"

Rías: "I'm curious. How did you get so strong?"

Yukio: "Strong? If you compare me to Grayfia I would be an ant" he shrugged.

Rías: "That would be, if I compared you to her, but you're so young and yet you have that strength."

"For now, don´t worry about it, your duty is to be as strong as you can and take your destiny in your own hands." He put his hand on her head while rubbing her hair, at first she complained, but then accepted after a while.

Yukio: "We should go out, Grayfia is waiting for us." A white hole was opened which swallowed them, and they appeared again in the previous mountain.

He could see Grayfia, who was standing nearby looking at them with a smile, so he approached to talk about his plans.

Yukio: "Today I plan to go to the underworld, do you think you can complete our deal now?"

Grayfia: "Do you really not need any help?"

Yukio: "No, just send me there, don't worry." For a while now he was offered help but he really didn't want to accept, he wanted to try his strengths out and it would be very difficult to explain, it's annoying.

Grayfia sighed and looked at him, "I understand... When will we leave?"

Yukio: "In four hours, I need to do some things first, we'll meet again at this place, see you later." He started to run in another direction, if he was going to the underworld he had to go prepared.

--

Grayfia: "He's very stubborn..."

Rías: "Onee-sama you'll protect him, won't you?"

Grayfia looked at Rías, who had a worried face and couldn't help but smile slightly.

Grayfia: "Rias, are you worried about Yukio-sama?"

Rías: "Ah! Not at all... I was just curious." She snorted and started walking in another direction "Let's go back for now..."

Grayfia: "She can´t be sincere with herself" She sighed and followed her.

---

He was jumping between roofs, a few days ago he contacted Yasaka and told her about going to the underworld, she asked him to go and see her before he left saying she would give him a gift, at first he wanted to refuse it but after some thought it was better to accept any help he coud get, he was still weak.

Due to his speed, the trip only lasted about two hours to get to Kyoto, he continued running and could see a deserted place with several rocks.

Yukio: "Should I call her? I really don't remember where it was." Just when he was thinking of contacting Yasaka, he felt a presence and saw a woman with long blond hair tied up and in a dark suit revealing beautiful shoulders.

Yasaka: "It's good to see you Yukio-kun." She said with a beautiful smile.

Yukio: "Yasaka-san your power increase is unbelievable."

Yasaka: "It would be thanks to your help, wouldn't it?"

Every time he would visit Yasaka to talk, he gave her some pills, they had a lot of confidence in each other, and she taught him to use his skills correctly, also as they often fought together to train, their powers increased.

Yukio: "You don't have to say it, I have to thank you for helping me with my skills, but the truth is that I came because today I will go to the underworld." When he finished his words the smile on Yasaka's face disappeared.

Yasaka: "*Sighs* Do you really have to go? What's so important?"

Yukio: "I can't tell you, but I assure you I'll be careful" he smiled as he knew she really cared about him.

Yasaka: "Well, anyway when you get something in your head it's hard to get it out of you, follow me."

He could only smile in his defense, in such a short time already she knew him well enough, so he followed her to cross the barrier, they came to the same room he was in the last time.

But this time there was a chest in the middle and he felt something inside, he was very curious, so he stared at it.

Yasaka: "I haven't told you what it is yet and you're already so interested."

Yukio: "Uh? What's that Yasaka-san?"

Yasaka: "I don't know much about that, we found it in ruins a few years ago, it has always been preserved, although all I know is that it has some kind of energy that is the same energy that you emanate from your body."

He looked carefully, thinking about what was inside as he took a step, he felt the same familiar energy that ran through his body when he used his dragon aura.

Yukio: "Can I open it?"

Yasaka: "Go ahead, but be careful."

He was able to shorten the distance and felt a presence inside, so he slowly opened it to reveal two black bracelets that emanated strange but familiar energy. When his hand touched one the system began to speak.

System *DING* [ Dimensional object found ]

System *DING* [ User has found a dimensional object - 3,500 Token reward ]

System *DING* [ Sacred-Demon Seal ]

System *DING* [ The user meets the requirements for absorption ]

System *DING* [ Absorption Begins ]

Yukio: "Wai---" He couldn't finish his sentence when the bracelets seemed to come to life and were embedded in his chest where they were absorbed, he felt the energy entering his body and pressure that made him kneel as he spat out a breath of blood.

Yasaka: "Yukiooo" she shouted as she ran quickly to him with tears.

He could only see her but not talk to her, he felt that his body was falling asleep and blood was flowing through his mouth and ears, a headache assaulted him when everything became black losing his consciousness.

--

He thought he had died, he heard nothing and everything was dark, but soon he felt the wind hit his body, he slowly opened his eyelids just to surprise himself of what he was seeing, he was standing on the sky with beautiful clouds everywhere.

Yukio: "What is this place? Did I die again?" He was totally confused.

Unknown "Die again? You look interesting young one." A noble voice was heard, when a beautiful woman appeared having six pairs of pink wings and a halo on her head, her hair was white with a loose dress up to her knees having pink eyes.

He was impressed and from what he saw, it was not because she was beautiful, but what happened is that he did not feel any energy emanating from her body, it was as if she did not exist and looked like an angel.

Yukio: "An angel?"

???: "I am a Serafín, but I can notice that in this world there are some but their power is too low..."

(Serafín did not have twelve pairs of wings, oh, the system said something called Dimensional...)

Yukio: "Does that mean you're from another dimension? What is this place?"

Serafín: "I am from a different dimension, and this place could be called a hidden world, if you ask yourself what I am doing here, you will see that I was sealed since the great battle of eons ago, I never thought that I would become a dimensional weapon" she sighed heavily as she rubbed her forehead.

Yukio: "Wait... Sealed? So you lost the war?"

Serafín: "Not really hehe, I sacrificed myself in order to seal my enemy, because of that idiot we remain here for eons."

Unknown: "Who do you call an idiot!"

With that appeared a woman with an appearance of a teenager, she reminded me a little of Akeno, having long black hair to her hips and golden eyes, the most characteristic thing were two horns coming out from her forehead, a tail coming out from her back and six pairs of black wings, he was astonished.

Unknown: "Why do I feel a dragon in this child?"

Serafín: "A dragon?" She began to evaluate the boy with her pink eyes, only to feel cold sweat on her forehead.

Serafín: "S-satan that's it!" She pointed at Yukio with her trembling finger and the demon tried to scan him just to look the same.

Yukio: "What? Why do both of you look at me like this?"

Satan: "Y-you...Don't you know? No... Who are you?"

Yukio: "...."

Serafín: "May I ask you something?" He felt strange at the way these two behaved now...

Yukio: "I suppose..."

Serafín: "Are you the Dragon of the Abyss?"

He got confused but he remembered that this was the name of his bloodline, so he answered honestly "Yes... Why?"

Both girls turned pale, then they stepped back and bowed.

Serafín/Satán "We're sorry for our lack of respect, Senior!"

His mind was paralyzed. What the hell is going on here? He did not understand the attitude of these two girls, but it was not the time for this, he had to leave this place, Yasaka must also be waiting for him to return.

Yukio: "Would you please stop doing that? I want to ask something."

Serafín/Satán "At your service!"

Yukio: "How do I get out of this place?"

Serafín: "Ah, raise your dragon aura a little and you can go out, to return or to enter you just have to think about this world and will return."

Yukio: "Well, I'll come back later." He released his aura and it was as they said, soon everything became dark and he came back to reality, where he could notice that he was lying on a bed, his wounds probably disappeared because of the system healed them because it had removed 100 tokens.

He was going to get up but he felt a little weight and turned his head to see Yasaka, he was a little surprised.

He was not blind, he knew this woman felt something for him but he had the body of a child, yet he also liked Yasaka.

Yasaka may have felt his movement and opened her eyes and immediately embraced him as she spoke.

Yasaka: "Are you all right? Do you have any wounds? I'm sorry!"

Yukio: "Hey, I'm fine, I should be the one to apologize for making Yasaka-san worry."

Yasaka shook her head as she looked him in the eyes, "I'm the one who told you to come and you ended up like this, I'm so sorry".

He put his hand on her head as he stroked it, it was strange for a child to stroke an adult, but he saw no resistance from Yasaka.

Yukio: "It's not your fault, I was careless but thanks to Yasaka-san, I discovered something very useful." He smiled at her.

Yasaka was sorry that he had to comfort her in this way, but she knew something...

Some time ago she had realized that Yukio was not normal, sometimes instead of seeing a child, he appeared as a young man in his twenties, she always wanted to ask but did not want to ruin everything, so she left it for later.

--

They got up and left the room, he had to meet Grayfia to go to the underworld, so he said goodbye to Yasaka who did not expect a hug with an extra phrase at the end.

Yukio: "When I'm older, I'll definitely come for you."

Yasaka was distracted but blushed greatly when she understood the meaning he meant but Yukio disappeared suddenly.

Yasaka: "YUKIOOO!"

He couldn't help laughing at her behavior, she was an adult woman but he still looked like a child, so he sped up his pace.

---

Two hours had passed and he reached the mountain, where he could see Rías with Grayfia.

Rías: "Why were you so late?" She frowned, they'd been waiting for an hour.

Yukio: "My bad, I had some things to complete. Can we go now?"

Grayfia: "Enter the circle." A red circle appeared, and they all approached but Grayfia frowned as she turned her gaze to Yukio muttering.

Grayfia: "Fox..." They were her words when she felt a scent on Yukio, who would even think that his "supposed mother" would give him a good talk soon, so they all disappeared into the circle.

---- In the meantime.

Serafín: "Do you think we can tell him?"

Satan: "He's still very inexperienced but without a doubt, he'll make it, I wouldn't mind helping him, if it means to get out of here..."

Serafín: "*Sighs* The problem is.... Will he accept us?"

Both girls looked at each other and decided something with great determination.

Serafín/Satana "Servants…"

Editor: maave