Rebirth in Against the Gods with The Ultimate System

Retsu suddenly open her eyes and found herself in a familiar place. She knew this place very well. This is her own inner world. This world is where her Zanpakuto resides. It was different than Yun Che's inner world but it's her world none the less. It was just a flat mountain top but the mountain was free from snow and it has a vast healing aura. As she was waking up, the felt massive amount of reaitsu started to pressure her. However, Yun Che taught her how to use the Absolute Suppression skill and she was basically immune to pressure. Even though she's immune, this pressure shows her this is not actually a good sign.

"Ara….. Looks like you finally show yourself in here. Unohana Retsu." A voice echoes in her inner world and judging how it echoes, this is the hollow she was about to fight.

The massive amount reaitsu slowly forms two giant pair of red eyes staring her down as if she was a lowly ant.

"Who are you?"

"Hoooo, are you seriously did not even remember me? I am the very reason you were known as the vile demoness in your previous world. You were rampaging using my name your previous life and unaware that I exist in your body?"

"Whoever you are, the previous me isn't the same as before. My sole existence and my reason is only for my young master. Now I ask you again. Who are you?"

The giant pair of eyes suddenly explode and form a gigantic amount of reaitsu. The reaitsu slowly compressed into a small body same size as Retsu herself. The compressed figure slowly forms its own face.

Retsu was quite shock because this face is actually…

"You're me?"

The figure slowly forms the same clothes as she was wearing right now but instead of a white haori Yun Che gave her, this figure was wearing a red haori with flame patterns at its end. The figure's head actually had fox like ears instead of real ears. Her hair was longer than her waist until it reach the floor but it slowly floats by the massive amount of reaitsu she emits. The most surprising part, this figure actually had tails. Not one but ten tails. The face of the figure was actually the same as her but this one doesn't emit the aura of a kind angel. More like the aura of demonic being.

"Hmm…hmmm… Look at you, after 1000 years of existing together. You didn't know I actually exist in your body. I am your blood-lust. I am your killing intent. I am your inner hollow. I AM YACHIRU." She emits a sinister aura showing off her might to Retsu.

"Impossible, no… I don't know what you are talking about. Everyone has a killing intent and their own blood lust. How come you're exist?"

Yachiru just laugh sinisterly and said "You're really that naive? You were one of the special people birthed in that world. You have the absolute slaughter and demonic aura. You kill and kill for a thousand year creating mountains after mountains of corpses. That continuous killing sparks the pleasure in you and you give birth to me. However, you were able to control these powers back then and able to exist together with your good side. That good side of yours, you went soft after losing that title and I am really disgusted with you. Back then, I was just a hidden power in your body and I will never be able to control you."

"However...…"

She lowers her face before revealing another sinister smile. She extends her right hand before massive amount of reaitsu slowly forms into a simple blood red katana.

She suddenly jumped towards Retsu in high speed attempting to slash her. Retsu however draws her sword and clash with the Yachiru. The clash was strong enough to destroy the entire mountain and push Retsu all the way back. Her young master was right, this hollow of hers is indeed stronger.

"Thanks to that poor soul entering your body, I was able to devour it and form my own soul. I can say not bad, that soul has a lot of power but that power is now mine. I can sense the power is actually the power of a Hollowfied Ten Tailed Demon Fox. No wonder I had these ears and tails. No matter, now that I have this combined powers from my own and that fox. I will obliterate your soul and take your body for my own."

Retsu was slowly standing up using her sword as support. She admits she was not strong enough to fight it physically. She must have an absolute willpower to resist its power. She regained her composure once more and confront Yachiru.

"Even if I was that vile, I am now rebirth with a new life in this world. My sole purpose is for my young master. It doesn't matter you are the manifestation of my inner hollow or a demon fox. I will subdue you and control your powers." Retsu control the air around her inner world and proceeding to heal her injuries.

"Lets see if you had the capabilities then." Yachiru proceeds in attacking Retsu as brutal as she can. She has her previous bad habit in fighting that is toying with her opponent. She wanted to torture Retsu before devouring her soul and body.

Retsu on the other hand was only playing defensive. She continued to absorb the air around her to heal her injuries. However, she couldn't keep this on for much longer.

"Why? Why do you despise me so much?" She asked Yachiru.

"Hmph, before this you never bow down to others. You kill and carved the path of slaughter back then. However, it was just a match. You lost that match and you immediately went soft. Thousands of years of accumulated powers lost just like that. However, what I despise the most is your death was caused by the same opponent you lost in the first place. You lost your blood-lust. If you still had it, you would reign the world as you please. That's why I despised you, that's why you died back then. This time, I will personally kill you and reign the world as I please." She increased her powers once more causing an ultimate slash towards Retsu. She was sent flying and crash in the nearby mountain. She emerge soaked in blood and she heals herself once more.

Retsu used her knowledge and skills to fight Yachiru once more. She didn't remember anything from her previous world but Yachiru remembered every single detail. She despised her for going soft after being vile for a thousand year causing her powers to decline. This decline causing her to be dead in the first place.

"Looks like I played with you long enough, it's about time we end this." Using the massive reaitsu, she slowly forms a massive fox arm and extend it towards Retsu grabbing her in one swift motion. Pulling her towards her face and said "After I kill you, I will kill that young master and that friend of yours. Let's see how I will reign the world after that."

All of a sudden, Yachiru felt massive amount of powers came from Retsu herself. She saw in Retsu's right eye was slowly turning red and her left eye was slowly turning blue. She tried to squish her once more but her reaitu arm was slowly disintegrating and releasing the powered up Retsu.

Retsu felt that she was slowly regaining her former self. Back then, she was one of the people born with unique reaitsu in their body. She actually had the spirit of Yin and Yang. The Yin is actually her good and angelic side while the Yang is a slaughter and bloodlust. In one thousand years, her Yang side had been growing and was halted the moment she lost that match. She took a few more years developing her Yin side until she succumbed to her death in the final match. Right now, her Yin side actually skyrocket the moment Yachiru wanted to kill her young master. Now that her Yin and Yang are now balanced, she can harness its powers combining them together to flow as one.

Retsu once more slowly standing up and look at Yachiru with blue and red aura swirling around her. This power is actually much stronger than Yachiru herself. Slowly opening her eyes reveling red and blue pupils in it. Her braided hair undo itself before slowly floating using her aura.

"You can kill me, insult me, humiliate me or torture me as you please. BUT..YOU WILL NEVER TOUCH MY YOUNG MASTER!!!!!!!!!!" She raises her hand and her inner world slowly turned from a peaceful and healing world into red blood world with demonic auras. Her Zanpakuto was slowly turning from a Nodachi into a short blade.

"BANKAI!!!! MINAZUKI (All Things End) !!!!" In her hands, a black red sword was slowly forming into shape and she was actually holding a sinister sword with red aura forming out of it.

Yachiru was shocked and small smile was slowly forming in her mouth. "She's back, her former self is back. This time she is way stronger than her previous life." She was happy and excited because her former host was transforming into a being even stronger than her previous life. She is probably match her young master in terms of power.

"This might be fun" She clutched her sword before proceeding to attack Retsu.

Retsu is now holding her bankaifelt she could control the world with it. She proceeds on fighting Yachiru once more. Clash after clash, Slash after slash. They destroy most part of the inner world by now. However, Retsu's attack are far stronger than Yachiru. She immediately releases a red blood slash and devour Yachiru sending her flying into the ground causing a crater to appear. Yachiru blast out of the crater and Retsu was in front of her staring at her.

"Its about time we end this."

"Indeed, the last one standing wins"

Retsu and Yachiru flying towards each other with massive amount of reaitsu on their sword.

"BOOM" Both energies clash with one another forming a giant ball of destructive energy. The energy then explodes creating an even larger crater in the inner world. In the middle of the crater, Retsu was at the opposite of Yachiru and the only separating them is the clashed sword they were holding.

All of a sudden, Yachiru's sword was snapped and the half of the blade fell to the ground. She fell onto her knees and looking at Retsu with a satisfied smile.

"It was a brilliant fight, you regained your former glory. More like even better glory. Now do what you have to do, finish me." Yachiru closed her eyes to hope for the end but instead of her life being taken she felt something soft on her chest.

"Wha…." She was shocked because Retsu is actually hugging her. She said "I know you hate me for losing in the past. Now it's different. I was fighting for myself and my pride back then. I didn't have an actual goal at all. All I did was following orders. Now, I have my young master. He once said that if the power used to protect, a greater power will emerge from it. I couldn't end your life because you are part of me. My soul and my twin sister. Something inside me told me that, you actually not a bad person yourself. You just wanted me to become stronger to bow the world but I became soft causing your hatred against me."

"You…." Yachiru was quite shock by this development. She immediately gives up to turn her into a killing maniac. She had her Yin side. She was spared because of it.

"Are you not going to kill me? You even called me...sister?" She hesitates.

"That goes without saying." She said slowly undoing her bankai, transforming the slaughter world back into the beautiful healing world. She slowly helps Yachiru to stand up and holding both of her hands,

"Then, I am more than willing to serve you once more, Sister. Truth to be told. This is not actually my full power though. If I used my full power from the beginning, your body would explode and killing me instantly." She revealed her secret to her. It means she could defeat her from the beginning but chose not to.

"So.. you.." Retsu was shocked.

"Hmm, I was returning you to your full potential. I never expect that your powers are even stronger than that. You are more than worthy to control me. My powers are your powers as well sister." She said before manifesting a fox hollow mask on Retsu's face. The mask looked just like those Kabuki Kitsune priests are wearing. This mask had multiple red patterns just like Yun Che's mask. The mask manifestation causes her ears to transform into a fox like ears and she grew a tail behind her. This officially turning her into a Visored.

"Your cultivation and body are not strong enough to use my full power. This mask enables you to use only a tail's worth of strength and power. In other words, it only increases your strength by two realms above your current cultivation."

"Yachiru, I…." Retsu wanted to thanked Yachiru for her gift.

"Save it, as long as you're alive. I will always support you." She said while moving towards her back.

"One more thing" she revealed a sinister smile.

*smack

"Eeeep" Retsu was shocked because Yachiru actually spanked her butt.

"If you really love him, you should start making a move. I know you are willing to share him but show him who is the main girl." Retsu suddenly blush when she said that. She barely did anything except hugging and talking. If she goes beyond that, thats…..

Retsu's brain got fried andoverheated by the thought. Yachiru though "Cheee, She's hopeless." She whispered to her again "If you're not making a move. I will do it for you." However, she was still overheated by the thought that she was unable to respond.

"This girl, she is really fun to tease. Never knew that the angelic demon is actually shy when it comes to finding mates." She said in her heart.

"Now run along, make sure he gets that." She taps her butt causing her to jump again. Those fox ears and tail really show that she's excited thinking about it.

"Before you go, make sure to let me take over you at some time. I want to have a taste at that young master of yours." She smiled before disappearing from Retsu's sight.

"Hmm, wait?!? What do you mean by that? YACHIRU????!!!???" she shouted knowing that Yachiru had disappeared from her sight.

Far from Retsu's position in the inner world, she reappeared once more. She looked at her direction and said "That girl and her young master will bow the whole universe one day. Who knows how many vixens started to flock to his side. I am looking forward to meet you in person. Yun Che."