Doom & Demon Slayer: Kimetsu No Yaiba Xover

Chapter 18

He sat up, taking off the box that Nezuko resided in off his back so he could focus on the demon up ahead. He exclaimed, fighting the fear in his voice, "I won't let you kill anyone else!"

"I'd like to see you try, brat."

Tanjiro announced his attack, "Water Breathing: Second Form, Water Wheel." he leapt forward while spinning repeatedly. He shut his eyes, casting away his doubt so he could focus on the battle. Daki jumped out of the way, sicking her sashes upon Tanjiro who deflected each one. However, he couldn't cut them, only being able to redirect their trajectory as they crashed into the buildings. Each time he deflected one of the sashes, his blade vibrated like crazy as he didn't have enough grip strength to keep it in place while deflecting. This demon was crazy strong, stronger than anything else he's fought up to that point. If this is the strength of Upper Moon 6, he could only imagine how hard Akaza hits considering he's a hands-on combatant.

Once Daki landed on her feet, she sprung towards Tanjiro while retracting her sashes. The boy prepared his next attack in anticipation, "Water Breathing: Eight Form, Waterfall Basin." he attempted to bring his sword down vertically to strike Daki. The demon started to spin sideways with her sashes beside her like a drill. Tanjiro made contact with one of the sashes, chipping a chunk of his blade. Another sash came up from underneath and carried enough momentum to blow Tanjiro away with a powerful uppercut.

Tanjiro reacted quickly, twirling to land on his feet but the momentum carried him back a couple more feet until he stopped and was able to regain his balance. His ears rung loudly as he felt like his brain hit every part of his skill with that punch. After he was able to regain his focus, he concentrated his breathing on his next attack, "Water Breathing: Tenth form, Constant Flux." He dashed forward with water trailing behind his blade. Daki continued throwing her sashes towards Tanjiro. The boy was able to deflect each one without compromising his advance, gaining more power with each swing as that was the point of the tenth form.

Daki furrowed her brows, assessing the situation as she decided her next maneuver to counter with. She zoomed towards the boy, realizing that the longer he ran meant the more power he would gain. She dove in with her sashes stabbing towards Tanijro from opposite sides. The boy performed a quick spin to try and knock away both sashes but left himself vulnerable for a brief period, a moment that the demon seized. With no wasted time, Daki smashed her leg into Tanjiro's skull and knocked him into a nearby building. The inhabitants inside screamed as they fled the scene, leaving Tanjiro to slowly pick himself up from the rubble.

As he forced himself to his feet, the sash wrapped itself around Tanjiro's legs and yanked him out of the building only to fling him into another. Tamjiro crashed into the walls, leaving him immobilized as Daki lifted the boy in the air and spun him briefly before slamming him into the ground as harshly as she could. Tanjiro felt several bones break as he rolled forward onto his stomach, trying to breathe. Someone came out from the buildings to see the carnage and cried out, "What the hell is going o-" but they were quickly silenced by Daki who consumed them with her sash. She made her way towards Tanjiro like a predator creeping up on its prey.

Tanjiro watched the poor civilian get killed like it was nothing, wincing in pain as he pushed himself up and called out, "Why do you demons always kill?" Daki smiled, stopping in front of the boy before crouching down and answering:

"Why? Because I can, because nothing will stop me."

"They're human beings just like you were! Don't you feel anything?" Daki began to playfully caress the boy's cheek as a sickly smile formed on her face as she continued:

"Silly boy, you don't think I acknowledge the fact that I was once human? How idiotic." She thrusted her fist into the boy's side, knocking him onto his back as he coughed out repeatedly. "Here's the real truth: I enjoy being a demon. I don't have to live with the same constraints that humans do. I can do whatever I want, whenever I want. However, when you're human, it's rule this, morality that. Who gives a fuck? Where's your freedom? How come people are shunned for doing what they want to do? I'll tell you why, it's because it goes against the interest of other people. People are selfish, they won't let others do what they want because it goes against what they want. Demons don't have that same morale constraint, we do what we want cuz we want to do it. Anything we want will be ours. Can you imagine how stupid it is to praise yourself based on the restrictions imposed on yourself since birth? You humans disgust me, patting yourself on the back because you live such restricted lives compared to us demons, can you even grasp how idiotic that sounds in the grand scheme of things?"