"This is the upper moon?! Even without the eye, you can definitely tell!" You held the Tessaiga in your hands along with your other sword. "It doesn't matter! I just have to win!"

You took the sword and put it in your mouth, using your bow and arrows in a blink of an eye.

You shot it at Kokushibo and he dodged it and appeared to your side. "It seems... you are good... with a bow... like your grandmother."

You dropped the bow and pulled out the Tessaiga. "Wait till you see what else I've got."

"Demon Breathing 1st Form: Kenatsu!" You tried to cut him without touching him by firing small concentrated wave of your demonic energy. When he disappeared you immediately stabbed the Tessaiga in the ground and pulls it upwards, unleashing pillars of his demon energy from the ground. Your senses weren't working against him. "Is he moving faster than my senses can keep up?! Alright, repetitive actions, hopefully it will help."

"That technique is... quite good. Your mother also... created her own form..." Kokushibo spoke behind you as you senses finally caught up. "And her father before her..."

"I'll make you draw that sword!" You shouted as you used Poison Breathing First Form-Y/n's Claws. You quickly moved your sword forward, forming a very large amount of poison in five massive waves shaped like a claw, which went at him but he appeared a couple yards away from you. You chained the forms and used Demon Breathing 2nd Form- Wind Scar. You looked the rift, or scar, between his demon auras. Once you found it, you quickly swung the sword into the rift, releasing a powerful energy wave that went at him.

"You're right, I should unsheathe my blade as well or else it would be rude of me..." Kokushibo used his Moon Breathing First Form: Dark Moon, Evening Palace. He quickly drew his sword and slashed at you swiftly in a singular horizontal motion in a crescent shape, creating numerous chaotic crescent blades.

"GGGHHHH-!!!!" Your hand came straight off as you opened your mouth and grabbed the sword with your mouth and dashed at him. "Alright, Asshole! You want fast, we can get fast! Heart! Beat! Faster!!"

"Inuyasha's grandson is really something, to charge at me after losing his hand." Kokushibo thought as you started picking up speed and dashed around him. "Not bad... your body and techniques certainly fit your mindset. Which itself is a skill."

You used Poison Breathing Second Form: Urokodaki's Mist. You cloaked your sword cloak in a poisonous stream and sent poison mist trails from all directions. Kokushibo swung his sword in a direction which barley missed you and got rid of the poison. He then used his Fifth Form: Moon Spirit Calamitous Eddy. Your arm came back and you grabbed the Tessaiga back from the ground as Kokushibo makes multiple curved slashes layered over one another, creating a rising vortex of sword slashes and crescent moon blades coming at you. You used your reflexes to dodge before ducking under an attack he swung. "Damn it! I'm still not fast enough, his slashes are surrounded by those blades. Always changing in size, I can't ward it off! I don't have enough experience, all I can do is dodge. But I'm a demon just like him, we're both growing as we fight."

You used Demon Breathing 3rd Form: Whirling Death. You leaped in the air and immediately dashed forward, twisting your body into a vertical spin aimed at him. He, of course, dodged it and you used this time to chain it again with a horizontal spin and he moved his head back to dodge it and swung his sword. You dropped the blade and couched, the attacked missed you as you used your leg to kick the blade upwards, as of try and kill him upwards. He dodged it and you used Wiring Death diagonal. He titled his head to the side and sliced off your shoulder, which you quickly gritted your teeth before going for a thrust. He did an upwards slash which parts cut you all over, the blood started dripping. You smirked, as the afterimage faded. He knew this and then saw you in the air, prepping a slash. He appeared behind you as a bunch of slash were seen on your body. "Impressive...to almost keep to my new skill. For a non hasira...you are doing quite well..."

"IM NOT DONE YET!!!" You went for a couple slashes and kicks but he dodged them all.

You used Poison Breathing Third Form: Shinobu's Punishment. You generated a wave of poison, shaped like Shinobu with her sword out, and sends it towards Kokushibo, stopping his incoming slash by having the Shibobu wave "stab" them or in other words, a slash. Unfortunately the attack only took the hit, and couldn't reach Kokushibo. You went for a low slash but Komushibo leapt over it, you threw the poison sword and Kokushibo blocked it. The sword entered the flesh sword as you span the Tessaiga and Kokushibo used Moon Breathing Third Form: Loathsome Moon-Chains. He swung his sword rapidly in two gigantic crescent slashes, from which a storm of smaller crescents spread, causing huge destruction to the area and it was just what you were waiting for. You used Demon Breathing 4th Form; Backlash Wave. When the attack reached you, You used your Demonic energy to engulf the attack in a twister and reverse its flow back on Kokushibo. The attack not only made him have to work, it pushed the other sword through his blade. You smiled and wasted no time, immediately using a new addition. "Adamant Backlash Wave!!"

You combined the Backlash Wave's power with the Adamant Barrage. The attack sends out tendrils of adamant, which pin forced the upper moon to slice them. But the upper moon noticed your smirk as the  the demonic energy within the crystal bursted out in a huge explosion. Kokushibo regenerated and so did his sword seemingly. "Demon on demon fights... there is no end. But for a hybrid... you are fighting for your very life."

Kokushibo appeared next to you and you quickly leaped in the air and used Poison Breathing Fourth Form: Boar and Demon Dance. You gathered poison on your sword and slashed his flesh while rotating backwards, deflecting his attacks in the process. Kokushibo pressured you and sent you back with every slash as you kept getting cuts and cuts. You used Poison Breathing Ninth Form: Giyu's Faith. You started to repeat the forms and your speed as well as strength accelerates and boosted with every strike. "Hm. Interesting. You created this breathing style too? Mastering it... creating it... shows your determination... as well as your cockiness."

"You're wrong. I'm not the cocky bastard I used to be. And even if that's true, there's too much at stake to be acting a fool now." You used Poison Breathing Fifth Form: Zenitsu's Clapback. You moved at in insanely high speed and unsheathed your blade and dashed forward at blinding speeds and strikes him faster than he could react, but Kokushibo blocked it. So you took a step back and put the sword in your sheath again.

"His speed...!" Kokushibo thought as you performed the technique to eight times in quick succession while slightly augmenting the power and speed of your dashes. The attacks hit Kokushibo's blade from every direction. When the last one ended you used Demon Breathing 9th Form: Flame Exchange. The Tessaiga absorbs his your blood to produce fire. "Using this while your healing factor is Clever, but not original."

He sent you back with a deep slash to the torso with made you spit out tons of blood. "Hm?"

He noticed he couldn't move his blade as you smirked a bloody smile at him. "He knows he can be killed and yet... he keeps fighting. I was wrong to think he was a fake demon... he tightened and flexed his muscles so the blade would get stuck."

You slammed the blade on the forum releasing your demon energy.

You then used Demon Breathing 6th Form: Demonic rampage, to hit him with a bombardment of swings and slashes. First, you tried attacking the him three times; one strike vertically, one diagonally, and one last devastating horizontally blow. The last attacked was deflected as he kicked the blade out of you while the others he dodged. He then saw you behind with with Poison Breathing Sixth Form: Tanjiro's Determination. You aimed at his back and created four fluid motions, shaped like a v and then a cross or an x. The attack missed and made him leap on the air. Once he did so you chained the attack to us Poison Breathing Seventh Form: Kanao's Advice. You leaped to Kokushibo and span around about 360 degrees, Kokushibo was pulled in. "A technique such as this... Kagome's grandchild..."

After Kokushibo got caught within the circle, You thrusted the sword twice. But Kokushibo blocked it and clashed your sword with his. You two began dealing blows while falling in the air. You used Demon Breathing 8th Form; Demon Dragon. A powerful burst of demonic energy is released and takes the form of a huge dragon. You harnessed your power so a purple dragon rest on the blade of your Tessaiga. You then slices Kokushibo with quick and devastating strikes, like a dragon crashing into a building. While Kokushibo blocked it, he could only defend while the Tessaiga and Lavender Sword started breaking the flesh sword faster than he could grow it back or a new one... or so he wanted it to seem. You used Poison Breathing Eighth Form: Miki's Precision as soon as you hit the ground. You swings the lavender sword, generating a very large number of arrow-shaped masses of poison, which are rapidly sent flying at Kokushibo in consecutive reprises. "Try dodging that in the air."

Kokushibo span his sword and sliced through the attacks with his Third Form: Loathsome Moon. Kokushibo swung his sword rapidly at you in two gigantic crescent slashes, from which a storm of smaller crescents spread once again. You quickly ran out the way and saw him land next to you. You immediately tried using Demon Breathing 10th Form; Demonic Pinwheel, but he stabbed you in the stomach before you could. You used the Tessaiga to cut off the sword and rip it out of you so you could heal. "Trying to keep me here... while the others deal with the upper moons. You are smarter than you look..."

"Are some kinda mind reader? Is that just a perk of being old?" You asked as your wounds slowly stopped healing. "Damn it! Not now!"

You used Demon Breathing 11th Form: Demonic Illusion. You charged at him but he saw through the illusion utilizes this technique to evade incoming and blocked the attack from above with his new sword. "Damn it! I... I don't stand a chance..."

You landed on the ground coming to a realization. Your Breathing got heavier and more louder. Kokushibo looked at you. "It seems you've lost your spirit. Tragic... that a swordsman such as yourself, will not join Muzan's ranks...hm?"

"Poison Breathing...Eleventh Form..." your demon form started to waver.

"He's concentrating his breathing? He knows he can't win... and yet that didn't break him." Kokushibo questioned your sanity as he saw your bloody body. "And it seems his regeneration has stopped... it's time."

"Rengoku's Wish!!!" You appeared all around Kokushibo and changed the tempo of your movement to disorient Kokushibo's vision. With his six eyes, he saw the technique takes the form of lots of flaming butterflies covering his field of vision. You then initiated Rengoku's exact stance, carving a deep impression that broke the ground. "I'M NOT LETTING YOU KILL MY FRIENDS!!"

You then unleashes a devastating dashing slash at Kokushibo, who had to swing his sword but you cut right through him.

You quickly flipped the blade and your body around. "RAAAAAAAAAHH-!!!!!"

"Enough." You swung the Tessaiga, but Kokushibo slammed the sword into the Tessaiga....

...And it broke...

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"W-What-?" You couldn't believe it. The Tessaiga... broke.

"Pity, a broken user, with a broke artifact." Kokushibo said as you pulled out the other sword, but he broke that one as well. The remains flung to the sides. He tried to cut your neck but you quickly got your bloody filled claws and scratched his face at blinding speed. You've been on life or death situations before... but this installed fear into you. You picked up the hilt of the swords and threw them at Kokushibo who deflected them. You smelled Genya and Tokito in the distance, and continued your onslaught.

He dodged them as you took your blood and solidified it, sending it at him as a blood waves.

It scraped his sides before he suddenly appeared behind you. "Let your family tree...end here."

"GAAAAAAAAAAAAAAHHHHHHHH!!!!!!!!!" You felt it, the blood rushing out, the deep cuts all over. The Demon form gone, your body reverted to how you were before you were a demon. And there on the ground, you laid. Gripping your chest with blood all over your body.

"Good-bye, Hybrid." Kokushibo raised his sword as Tokito rushed over.

"Y/N!!" He shouted but it was too late, your head was cut off... and it rolled to the wall Genya was hiding behind...
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"Nezuko? What's wrong?!" Urokodaki looked at Nezuko as she had a horrified look and rushed out. "Wait! Nezuko!!"

"Hey! Nezuko!" A voice called out, you found yourself in a memory. In your dying moments... hehe. It felt like something you'd laugh at, your life flashed after you died. A young you sat down next to a young Nezuko.

"Calm down, we wouldn't be here if it wasn't for your father." You told Nezuko as she cried in your arms.

"You pushed yourself over the limit to save me." She said as you shook your head.

"That's itself is commendable enough, isn't it?" The younger Y/n said, Nezuko was silent for a long time. Before she looked at you.

"The day we met....do you still remember it?" She asked as Y/n smiled.

"How could I forget... ?" He said as she looked at him with her bright eyes.

"Let's make an blood oath... like before!" She bit her thumb and a small trickle of blood came out.

"What's with the sudden rush...?" Y/n wondered as he bit his thumb. The blood trickled down as well.

"Let's promise to protect each other, no matter what!" She said to him as Y/n looked at her.

Something as childish as that should've been a huge red flag. But I did it anyway.

"Do you promise?" Nezuko asked, as Y/n collided his thumb with hers.

"I promise." He smiled as you looked at the bright light.

"Heh. Yeah, not all promises can be kept."

"Well then, Y/n, you better explain to Nezuko why her favorite person is leaving her behind." Nezuko's mother's voice rang out to you.

"And Y/n, I thought you said you weren't going anywhere this time." Nezuko was next.
"Y/n! Thanks for all you do!" Tanjiro's voice floated.

"If you want something... you just fight for it!!!" Giyu was always the hidden nicest.

"Y/n! Y/n! You saved me! Thank you, thank you! I thought I was gonna die!" If you could go back, you'd maybe treat Zenitsu a little better.

"Ahahahaha! Keep it up! We'll smash through this and win, Mutt!" Heh, it seems that stupid boar still can curse you out in the next life.

"Come back safely." Urokodaki said, you'd miss the wise charm he had.

"Y/n, thank you. This should help us in the fight against Kibutsuji." Tamayo seemed to always be hopeful.

"Y/n, this is going to work. It has to." Yushiro and you had to warm up to each other, but... friendship works in mysterious ways.

"Y/n, you've grown. Not just strength, but you've found your way." You figured Shinobu always cared about you, even if she didn't show it.

"Y/n! Lets give it our all!" Kanao gotten more confidence, she should use that on Tanjiro after all this.

"SET YOUR HEART ABLAZE!" Hehehe, you couldn't wait to see him in the next life.

"You're making your way to flamboyant, Y/n. You still got a long ways to go though." Uzui said as you couldn't help but chuckle.

"I trust you. Thank you for your help." Tokito had remembered the person he used to be.

"Y/n... You okay?" Sis, you figured she'd probably be confused. But she'd understand.

"Yeah, I think it's time." You smiled and started to walk towards the light until...

"Be careful, whatever it is, you better come back."

"Come on! You should know me by now. When I say I'm gonna do something, that means I'm gonna do it."

"Y-You better come back! Promise me!"

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"That's right." Another head grew from your body in a split moment as red aura came out around you. "I'll always make it back to you! You need to return that necklace to me."

"What's the hell?!" Sanemi shouted as you rose up. Your black hair remained as your eyes shined Golden.

"Until you can hand that to me... I WILL NEVER DIE!! I PROMISE, I WILL COME BACK TO YOU!!" You shouted as veins started growing on you, you were pissed. You took out Kurikaramaru and your blood dripped on it.

You lit the flames on fire with Nezuko's blood art. The blade turned crimson red and stayed that way. Your robe was open revealing,"So, he's gained demon slayer mark as well..."

The Dragon demon slayer mark replaced your scar from Akaza.

"I wasn't expecting you to rise again." Kokushibo said as you immediately appeared behind him.

"Let's see how well I fare now, shall we?" Kokushibo was shocked but soon found himself being forced back by slashes you already left. While that was happening, you put your sword in the sheath again. You then smiled at the others. "Whoa! I didn't know you guys came this way! What's the special occasion?"

Kokushibo seemingly appears behind you and Genya shouted. "Y/N! BEHIND YOU!"

You slammed the hilt of the sword in Kokushibo's chest slashing him with a Dragon aura coming out after every slash, similar to Kokushibo's moons. Himejima looked at you. "He's awoken his demon slayer mark and mastered his demon form...Not only that, he's using repetitive actions with his breathing style."

"Himejima, go help Tokito." You told him as he wasn't too sure, Sanemi was catching his breath. "And Sanemi, go check on your brother."

Himejima eventually left to help Tokito as Sanemi sucked up his urge to fight to go to his brother. Genya looked in shock but hopeful. "You can do it!"

You took an unusual stance as Kokushibo gritted his teeth. "You, what is that breathing form?"

"What? You don't recognize it?" You asked him as he grabbed his sword. "This form was used by used by my mother, Moroha. A form which she branched from her father's, Inuyasha's Sacred Hound Breathing, (which is branched from Sessuhomaru) and her mother's, Kagome's Arrow Breathing."

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You smirked as you both look at each other from far away. "Crimson Dragon Breathing Style."

Before he even saw you reach for your bow, you pulled out your bow and channeled your demonic power into the bow, generating energy arrows. "Crimson Dragon Breathing First Form-Heavenly Arrow Barrage."

You shot a Sacred Arrow at Kokushibo which he instinctively had to side step and dashed at you, but the arrow went in the air. The arrow spilt and created a barrage of sacred arrows that rained down on the Kokushibo. "The speed! It's increased this much?"

"I can see it. That world you're so fond of." You told Kokushibo as you walked to him before dashing at him. Kokushibo dashed as well as the two of you clashed in the middle. You swung your sword and he dodged it, he went for a thrust stab but you glided your sword up his and went to slice the neck. He moved his head to side only to have his ear cut off. He quickly regenerated it and you let him slice your hand off, you grew a new one instantly and threw your old hand at him as a distraction before slamming a dragon slash into his body, pushing him far back and destroying his kimono. "Hm.. you know, isn't it weird with all those eyes? I can't imagine all the eye crusts you have to get out."

"You tore my Kimono... once I've put you down, the rest should be easy." Kokushibo gained a bigger flesh sword as you smiled.

"Oh yeah? Show it to me, Pink Eye." You two suddenly took off at blinding speeds, clashing and fighting with each other through the area.

"What the hell?! I can't even see them anymore! They're speeds are in a whole new dimension!" Genya thought as Kokushibo used Seventh Form: Mirror of Misfortune-Moonlit. Kokushibo swings the gigantic version of his sword in a powerful frontal crescent-shaped slash that creates powerful multi-directional long-ranged slashes in the ground. You quickly dodged that and ran to him with your sword out.

When he noticed you smoothly dodged them, he used his Eighth Form: Moon-Dragon Ringtail. Kokushibo uses the gigantic version of his sword and creates a singular gigantic crescent-shaped slash that slowly decreases in size, creating dozens of crescent moon blades. You quickly used Crimson Dragon Breathing Second Form- Barrier to manifests a large red barrier to protect yourself as you kept your momentum. You went on the offensive and used your bow again and used Crimson Dragon Breathing Third Form: To Love's End. You shoot three sacred arrows to distract Kokushibo, then leap and somersault forward into the air. At the speed you were going, he had to use his instinct. When you got behind him, you shot three more sacred arrows at him. Kokushibo quickly saw this and used Ninth Form: Waning Moonswaths. Kokushibo creates a stream of long-ranged crescent-shaped vertical and horizontal slashes along with numerous crescent moon blades which you immediately use Crimson Dragon Breathing Fourth Form: Snipe. You leaps backwards with your momentum to dodge the slashed and shoots two arrows at Kokushibo, a regular one and a sacred one. Kokushibo sliced the regular one while the sacred one exploded in his face, making him have to heal all that back in no time flat, but it was going slower. "What is this? It burn...!"

"Yeah, turns out, my demon energy likes to eat your defenses. Shinazugawa awakened his mark now, and Himejima has as well. Their waiting for the time to strike. I need to weaken him to the point where we can all move on." You saw him raise his sword again and you dashed for him. He used Moon Breathing Tenth Form Piercing Guillotine: Ivy Moon. Kokushibo creates a long-ranged triple-layered slash twister full of crescent moon blades with the gigantic version of his sword. You quickly used the second form to protect you. "You may know everything I'm going to do but that's not gonna work because I know everything you're gonna do! Strange, isn't it?!"

You used Crimson Dragon Breathing Fifth Form: Crimson Dragon Wave. Thrown from the sword is a huge energy attack shaped like a dragon, capable of striking through open air. From which a storm of smaller dragon attacks spread, causing huge destruction in a small area. You covered him back but he just kept dishing out more attacks. You did a backflip into the air and shot out beam of your demonic energy.

"Y/N!" Sanemi and Himejime joined back up as did Tokito. You felt Genya's aura change as Kokushibo used Moon Breathing Fourteenth Form: Catastrophe Crescent Moon. Kokushibo created a chaotic vortex of powerful extremely long-ranged omni-directional slashes that destroys whatever was caught up within its attack radius. You and the others had sprint though the gaps. Kokushibo's vision was distracted when Himejime's prayer bead hit him. You unleashed Crimson Dragon Breathing Seventh Form-Crimson Backlash Wave. Very similar to Backlash Wave, this special technique sends Kokushibo's own demonic attack right back at them, hitting him with his own demonic energy and that of Kurikaramaru's. He was pushed back a bit before he managed to get out of it. Himejime managed to hit the shoulder completely off. Tokito had his leg cut off but still stabbed him.

As you and Himejime charged for him, Genya shot his bullets, managing to sink into Kokushibo's arms as it changed into tree roots and held him down. You raised your sword to use another form when suddenly Kokushibo roared out and sent send slashes through all of you. You worried about everyone else as you immediately healed. All you was as Tokito without a lower half and Kokushibo with a bunch of swords out his body. You, Sanemi and Himejime all dashed for him again as you had burning anger. "YOU BASTARD!!!!"

A root held him in place but after Himejime and Sanemi managed to cut off the head, he grew another one as Genya's voice rang through your ears, you knew that he was cut in half and tried not to cry. "FINISH IT, Y/N!!!"

"ATONE FOR ALL THE LIVES YOU TOOK!!! Crimson Dragon Breathing Fifth Form: Crimson Dragon Wave!!!!" As you raised the sword, Kokushibo looked at his hideous form and started to fade away. You threw an huge energy attack shaped like a dragon which striked through open air to reach him.

"Who...are you...?" He asked as the attack enveloped Kokushibo. You glared at him.

"I'm Y/n Higurashi! Son of Moroha Higurashi and Tenchi Himiken! Grandson of Inuyasha and Kagaome Higurashi! NOW SHUT UP AND DIE!!" You landed on the ground as Kokushibo faded to ashes. You turned around... to not a pretty sight. "Genya... Tokito."

"Y/n... thank you... please... go help, the others..." Those were Genya's last words to you... and so you left. Just like that, with tears forming in your eyes. You left with a boiling rage as you started zipping through every crack and hallway you could find.

"MUZAN!! HOW MANY MORE HAVE TO DIE!? HOW MANY?!" You gritted your teeth as the castle started shaking. "I WILL NEVER FORGIVE YOU!!"

Suddenly, the castle fell... You stood up and sniffed the air. "I found you, Ugly Bastard."