Fight for Superiority

Standing in the middle of the destroyed city, Hiroto's mind was in a state of carnage, as various memories and visions filled him. Emotions from different people started to assault his mind.

'W-What is this?' Hiroto's consciousness started to slowly appear in his mind, seemingly battling against another lifeform trying to take control of his entire being.

Then, the scenery within his mind changed. A familiar-looking forest covered in snow appeared in his min. In the midst of the night, Hiroto's house appeared in view.

The scene then flashed red. The house is now covered in blood, with the scene of his dead mother, brothers, and sister.

Hiroto's mind started to fill with anger and sorrow overseeing this once again. The heads of his siblings then slowly turned towards him, their lifeless eyes piercing Hiroto.

"Why didn't you save us?" Takeo's voice came out.

"You left us to die." Hanako's lifeless voice flowed towards him.

"You didn't take us with you…" Shigeru said, blood running his face.

'No…' Hiroto thought to himself quietly. 'This isn't real.'

"Oh, but it is." Muzan's voice slowly seeped into his head.

'Get out of my head, you Demon!' Hiroto shouted inside his mind.

Muzan gave a low laugh, saying, "Am I, the Demon?"

The scene in his mind flashed again, with Hiroto standing in the middle of the destroyed city he fought Muzan in. The sky was painted red, with thousands of corpses surrounding him.

Looking at his feet, the lifeless body of Tanjiro and Nezuko lay before him. All around him were the dead members of the Demon Slayer Corps.

Shinobu and Kanao were piled on each other, missing limbs as their eyes stared back at Hiroto.

Zenitsu, Inosuke, Giyu, Uzui, Rengoku, Himejima, Shinazugawa, Obanai, Mitsuri were all strewn across the blood-soaked ground. Thousands of mangled bodies laid around him.

And all of their eyes stared back into Hiroto. Suddenly, all of their eyes shifted, starting behind him. Following their gaze, Hiroto turned around, and saw… himself.

But this version of him was different, he looked exactly like a Demon. The Demon stared back at Hiroto with a gaze full of hunger. Lifting his hands with razor-sharp nails, he licked the blood off of them.

"That's not me…" Hiroto muttered. "That can't be."

"What's wrong?" The Hiroto in front of him said with a grind. "You can't accept the truth? This is who you are now. It's who we are."

"What are you talking about?" Hiroto said, narrowing his eyes.

"Are you stupid?" The Hiroto across from him mocked with a distorted voice, "Take a good look at me, this is what you've become now. Well, more accurately, it's what you're about to become."

"A Demon… Muzan's blood." Hiroto muttered, remembering the events that led to this moment.

*clap clap clap*

"Congratulations, you've figured it out." The Demon said, clapping his hands. "But you've got one thing wrong. It's not Muzan's blood anymore. It's mine, ours."

"I don't care about that, what I want to know is what the hell is going on," Hiroto said, reaching for his sword on his hip, but finding nothing.

"So impatient." The Demon said, "Forget about Muzan, he's already long gone. He wouldn't stand a chance anymore anyway since I'm everything he ever wished to be."

As Hiroto was about to retort, a voice suddenly echoed throughout his mind.

"H...Hiroto!"

"Shinobu?" Hiroto muttered.

The Demon clicked his tongue, "Tsk, these annoying ants. It won't matter soon, I'll completely assimilate with your consciousness, completely taking your mind and body over as my own."

"Like hell, I'd let you," Hiroto said, readying himself as he could feel the killing intent seeping from the Demon across from him.

The Demon kicked off the ground, crushing the corpses under his body as he launched towards Hiroto.

Hiroto saw a claw approaching his face, causing him to duck under the attack and roll away. Turning around, he could see the Demon version of himself growling in a low posture on the ground, eyeing him down.

Out of the corner of his eye, Hiroto could see a silver glint under a person's arm. However, in that instant, the Demon launched his next attack and sent a kick towards Hiroto's head.

Leaning his head back, Hiroto just barely dodged the attack, but then sensed something coming from behind.

Throwing himself to the ground, Hiroto kicked his legs up onto the Demon's body and used it as a springboard to launch himself away towards the silver glint.

Following right behind him, the Demon swung his claws down towards Hiroto's exposed back.

*shik*

With a katana in hand, Hiroto managed to block the claws in time with a backward grip behind his back. Jumping up into the air, Hiroto spun his body and swung the sword towards the Demon's neck, who managed to sidestep out of the way.

Landing on the ground, the two stared each other down. Hiroto, seeing himself as Demon made him uneasy, but now wasn't the time to be thinking of such matters.

The sword in his hand was a normal issued Nichirin Blade, but within his hands, the silver blade turned to a Crimson and Amethyst color.

"Heh." The Demon chuckled, lifting his hand up and sticking it straight down into the side of his neck. The sound of bones breaking and crunching echoed throughout the space, as he slowly pulled his hand out, Hiroto saw a bone-like hilt in the Demon's hand.

Then he saw a sharp bone-like blade, that was shining with a Crimson and Amethyst color as well.

"You should've realized by now." The Demon said with a wicked grin. "I'm you, but better."

-----

Back in the destroyed city in the real world, the current Hiroto was standing still in the middle of the street. Shinobu was being supported by Kanao as she watched from a distance.

"H-Hiroto!" Shinobu shouted out, seeing him in his current state. "No… why him…" Shinobu muttered as tears started to fall down her face. Kanao, supporting her, was in a similar state, as they couldn't believe what they were seeing.

Everyone was wary, as the remaining members of the Demon Slayers had conflicting feelings within them. The Flame Hashira, Hiroto Kamado, fought with his life on the line to kill the Demon King, Muzan, was turned into one in the end.

However, Hiroto right now was just standing still with his head down, not moving.

"What's going on? Why isn't he moving?" Zenitsu muttered.

"I don't know, but this is our chance," Muichiro said, gripping a sword with his remaining arm.

"Wait! We don't know if he's fully turned yet!" Tanjiro shouted out.

"We can't wait anymore! You've seen how dangerous he was, he was about to kill you and everyone else!" Sanemi shouted out, as he supported himself with his sword.

"But he's stopped!" Tanjiro retorted back. "He's probably trying to fight the instinct within him, just like how Nezuko did."

"That was a unique case." A young boy's voice came from behind the group. Coming into view, Kiriya Ubuyashiki, the heir to the Ubuyashiki family walked forward.

"Ubuyashiki-Sama, you shouldn't be here, it's too dangerous!" Uzui said.

"Everyone is fighting with their lives on the line, would I be the heir of the Ubuyashiki house if I didn't do the same?" Kiriya said.

"This is different," Muichiro commented.

"Everything is different now," Kiriya said, turning towards Hiroto who stood opposite of the group. "We need to take any chance we have. Everyone is too tired and injured to continue another lengthy battle, so this has to end."

"Wait!" A girl's voice cried out from behind the group, as Nezuko pushed herself to the front.

"Nezuko!" Tanjiro cried out, seeing how Nezuko's eyes are back to how they once were before she became a Demon.

Everyone was in complete disbelief, as the once gagged Nezuko who was a Demon now seemingly looked no different to that of a normal girl.

"Please wait!" Nezuko pleaded, "Brother is still trying to fight against it! He can overcome it, he's stronger than me!" She then took out a bottle, one that Shinobu recognized immediately.

Shinobu spoke up, "That's the medicine that Tamayo and Yushiro made for Nezuko, to turn her back into a human."

Nezuko nodded and said, "Lady Tamayo wasn't sure if one was enough, so she kept another one next to me just in case. It's the only bottle left."

Before anyone could speak up, Giyu quickly said, "Would it work, if we used it on Hiroto."

Nezuko clenched her hands, turned to look at Hiroto and said,