Standing on top of the mountain of Shuuki was a young man appearing like he was in his early twenties exuding a threatening presence that made him appear more like a demon than a monster around him. He hid his face with the mask of an Oni deciding to change his mask looking down at the people below.
He was wielding a double edged sword that emanated a purple shadow that stabbed on the back of the shuuki. He narrowed his eyes looking down, finding a group of people.
There are at least 10 Anti-demon that haven't appeared in the canon story and most likely died or retired during that time frame. They were all hesitant to even fight him where he sat down looking down at them like an insect not worth his time.
On the other hand one stood among them was a beautiful and buxom woman with long dark blue hair that had braids rolled around her hair and yellow eyes.
She is often dressed in the usual Anti-Demon Corps uniform with the upper portion of her breast being viewed and long gloves. Her demeanor seems like a calm, respectful and ambitious woman. This was the chief of the 9th Unit of the Anti-demon corp, Fubuki Azuma.
For the next 6 years she had been searching for him yet the Onmyou Agency had been adamant to not do anything against him. This only fuels her curiosity and eagerness to know the reason why they were afraid of him. Only reason why they were there was because one executive in the agency gave a secret mission to hunt him down.
She was excited to finally get the chance to fight him and see for herself how strong this individual was. Fubuki was not disappointed and even felt hesitant that she may lose against him when he was unfazed by their arrival and kept on looking at them until his gaze locked into her.
As someone from the Azuma family, they prided themselves in strength and power that seeing someone looking at one of them like a prey felt her pride being disrespected.
"I've finally found you, Kuro Oni."
She said having a powerful barrier around them to ensure he won't escape. Fubuki believed that they were able to ambush him using one of the abilities that turn them undetectable and another was illusions.
Unfortunately, everything that happened till now was Yuuki's plan wanting to fight her since she had been one of the few people who kept on trying to find him. He let her make the Onmyou Agency excited that they might be able to have the chance and gain info.
Yuuki was incredibly weak at the moment since his clones are training within his pocket dimension, finding that he doesn't have range in using clones and only depends on his stamina. At the moment he has 10% of his true power and can see that he'll lose against Fubuki with the power that he has.
If it's his true power then he has a chance but his fighting instinct is telling him to not engage. However, his fighting spirit told him to fight and dominate.
"You are surrounded and if you come with us and cooperate then we will not do anything to harm you. We only wish to know a few things about you."
Fubuki calmly explained while Yuuki stood up from his corpse and began to laugh, confusing them all. He descended into the ground making everyone tense up and stood in front of her where both blasted their own dominating aura where Yuuki started to like her more and more.
Even in the series, Yuuki was into milf and oyakodon moments but most importantly was her strength that even holding back was well capable of fighting the Canon Yuuki in his "Whirlwind:Sky"
'This kid…if he's human with powers then I'll make him.'
Fubuki thought to herself thinking that it will help his family grow, having the perfect seed to produce powerful future generations and even thought his mother wouldn't mind. Yuuki can feel her emotion and hear her speak.
"What is your answer, Kuro Oni?"
He shook his head and Fubuki already predicted this.
"If that is the case then we have no choice but to force you."
She wasn't doing this for Onmyou Agency anymore and was only going to test this capabilities and Yuuki knew this causing him to smirk and instantly felt danger as he barely manage to deflected an attack that send him through the mountain of corpses as Yuuki halted his momentum using his power and saw Fubuki activating her powers.
She summoned a yari-based spear out of thin air with a symbol resembling the sun on the spearhead that exuded incredible power. Yuuki took a stance taking deep breaths, rushing her where she immediately extended her spear but was shocked to find it being easily deflected by his sword.
[ Sunset ]
This was her ability, from what he knows about it from the series it basically acts like True Longinus but weaker than that spear. She expertly showcases her skill in spearmanship where Yuuki was getting wouldn't by her attack.
"Chief!"
Yuuki soon was surrounded by 5 Anti-Demon Corp trying to subdue him. He took breath controlling his thought, emptying it feeling his shadow spreading where upon the radius was he able to easily knock them all out.
[ Shadowed Blade of the End - Waves Of Desolation ]
Their senses felt like they were swallowed by endless darkness where they instantly knocked out while Fubuki saw this and couldn't believe it. He moves akin to a shadow swift and undetectable.
This was part of the [ Gathering of Ten thousand shadow ] where Upon using the Gathering of Ten Thousand Shadows, the user's movements appear to an observer as if they were a shadow and that they would feel like darkness is surrounding them, making the body numb and difficult to move.
This allows the practitioner to be able to move in a silent fashion and disappear without a trace, making it extremely challenging to have their movements read because of its unpredictable nature. It was far from perfected since Yuuki was not a swordsman and only dabbled it out of boredom from hitting a wall.
Yuuki flipped as the Fubuki swung her weapon moving to check up on her subordinate and found that they were still alive. Soon a spectacled young woman with a buxom figure, having long blue hair and a white strap wrapped around one of her hair strands arrived.
"Maia and the rest you step aside. None of you can defeat him."
The young woman, Maia Azuma, her oldest daughter and vice chief of the 9th division. She saw her mother's serious expression and understood that their enemy was above their league and quickly used her ability of [ Great One ], it allowed her to use an invisible force in the form of a hand as shown when she stopped Homare from moving, she can also make her "hands" disappear. She can also turn her "hand" into different forms using the element nearby.
"Good, I don't like distraction and certainly ruin my dance with a milf."
Hearing this certainly was a surprise but didn't show it in her face and instantly blocked his sword, shocked that he was faster than she anticipated, sending shockwaves into the air.
"Milf? How did you guess I'm a mother?"
She was trying to distract him, allowing her to push him before performing multiple consecutive stabs yet he managed to barely evade them. Yuuki was getting pumped up from their fight and smiled under his mask and said.
"Not that milf, I'm talking about Monster I Like To fight! It has certainly been boring fighting weak shuuki all these years."
Yuuki's speed became faster as did a horizontal swing that Fubuki easily dodged and kept her momentum by twisting her body and swinging her weapon to the side in which Yuuki jumped to avoid.
"You certainly are an interesting individual. Come at me with all you got."
Fubuki shouted while Yuuki power was growing as he took deep breath then the two began to confront each other where Maia and the rest of the Anti-demon corp watched in awe at the sight of their chief fighting someone at equal terms, no, She was stronger than him yet the two were rapidly growing in strength.
Their clash caused the landscape to be destroyed and their slices to form small ravine. Yuuki was learning from her technique but was receiving more damage than he anticipated.
Fubuki managed to pin him to ground and stabbed his shoulder trapping him as Yuuki struggled to escape, feeling her foot stepping on his body and from his view saw her glorious undergarment. Fubuki knows this but isn't bothered by it.
"You can't win. Just give up."
She barely exerted her full power and only used around 20% making her confused how someone this weak is able to fight countless Shuuki and make her feel uneasy. It was then she saw him do something and pressed his temple and said.
"Thanks for the view."
Yuuki said before the ground shook, Fubuki jumped from the falling dirt and was shocked to see him stand even with all those wounds on his body. His eyes soon changed, having his sclera into pure black exhaling a steam of air.
[ Limiter Removal x2 + Ultra instinct ]
"You have to kill me first before I give up."
Fubuki was caught off guard when he appeared behind her and thinking that he was still in front of her and immediately blocked the attack then noticed that his power had grown significantly than before.
'He seems to have done something to his body…'
She thought herself and began to increase her power even more to combat his attack. Yuuki has been fighting himself and learning as it goes, finding any weakness that he can exploit and improving them accordingly.
However, Yuuki was fighting using a style he was not expert on and was going blind on how to apply what he knows from a fictional world. He doesn't even have Qi like that world but doesn't care and is doing something similar to Kimetsu no Yaiba since they also exert their technique in a similar manner.
"Hahahaha yes, certified Milf indeed!!"
He noticed growing manically where Yuuki was pushing himself to the brink of exhaustion while Fubuki was shocked that he was getting stronger and finally notices it.
'The way he uses his sword….this is not his fighting style. He holds the sword awkwardly and uses it as a tool rather than an extension of his body.'
Fubuki assesses his skill, noticing that he doesn't have the proper way of executing his sword skills. She was still able to wound him while her body remained unarmed.
'His using me to grow but why? From what I know he often uses unarmed combat that shreds or explodes his opponent.'
"Blurgh!"
Yuuki suddenly felt the effect of his technique and coughed blood allowing Fubuki to be stabbed throughout his chest and saw him vomit even more blood. Fubuki wasn't expecting that she actually going to kill him and was so distracted that it slipped her mind.
"Not bad…you actually killed me. Guess it's your win."
Fubuki, unsure what to make of the outcome, was disappointed that she wasn't able to hold back and actually killed him.
"Though, I can't come with you nor join you but I'll certainly pag you a visit in the future."
"You're oddly calm for someone who is about to die."
"Oh this?"
Yuuki just pulled himself off the spear showing his chest having a gaping hole and coughed more blood.
"Tis is but a flesh wound."
Fubuki blinked for a moment and couldn't help but let out a small quiet laugh and soon saw him fall to the ground on his knees but managed to catch him and his head on her breast. She couldn't help but comfort him, patting his head, recalling her desire to at least have a son.
"I won't die, I can't die. I'll be back but until then get stronger. I won't let a Milf go."
It was strange until Fubuki saw his body slowly disintegrating and until nothing was left. She was left confused and wondered what kind of outcome had just happened.
'What an interesting person.'
She muttered wondering what he meant while her subordinate went to check up on her, a young man with white hair and marking sitting on top of a tree suddenly opened his eyes and then smirked.
"Truly a monster I like to fight again."
Yuuki didn't die because he can always go into a new clone and turn it into a new main body making virtually unkillable.