My Upgrades Are Invincible

Well even if Daki and Gyutaro's blood wouldn't completely cure Nerine, I imagine with how her demon blood was given to her by Doma like the sibling pair had his blood, that the resonance would do a decent job of making Nerine more manageable as I knew that if it wasn't for my overwhelming strength that she likely would have attempted to tear out my throat while I slept but I had thoroughly cowed any attempts of rebellion out of her.

And what do you know... my compass is already picking up the signs of a demon. then again flying through the air with a compass that would pick up any demon within fifty kilometer is extremely convenient.

'Hmm. despite how hot Daki is, she is too much of a brocon and has been eating humanity for literally a century at minimum so it's a firm nope on bringing her back to Orario.' I thought as I followed the way my compass was pointing already preparing myself to kill Daki and possibly turn this place into a warzone like the battle between me and Muzan destroyed the Kamado house as well as toppled dozens of trees during our very brief battle.

But this was going to be a battle between me and two high level opponents as I put Muzan at barely level seven in terms of Danmachi strength as Alfia was level eight and would have stomped him with her sound waves so the siblings would be around a peak level five individually at most.

With a mighty crash my fully armored body smashed it's way through the ceiling of one of the buildings and I saw Daki blink in surprise as my sword was swung out of its sheath straight for her neck as I tried to end the battle instantly with a powerful laido draw, but Daki was able instantly launch a dozen ribbons which my sword although could cut them down easily enough but the time it took for my sword to slash through the magical ribbons gave the demon enough time to throw herself backwards through the thin paper wall behind her.

"What the hell are you doing?" She screeched as I blitzed forward while wreathing my sword in lightning making an extremely loud racket as imagine a hundred tasers going off at once and that was the sound of the lightning arcing off my sword and I did it to one get people to start fleeing the area as well as flash char the wounds I started putting upon Daki.

"Killing you obviously or did all the semen get stuck in your brain after being jacked off on your face." I chuckled making her fume in fury and I saw a third eye opened on her forehead showing that Gyutaro was now paying attention to the battle as he was basically melded into her body most of the time.

"Oh, did your Onii-Chan's heart go Doki- Doki, hearing about his little sister's face getting plastered by big foreigner's." I continued as this woman had double the regeneration with Gyutaro attached to her and with all the ribbons constantly slashing at me as we fought outside, literally cutting through buildings like a molten knife-like butter, I wanted to separate them so when I destroy one of their bodies, I could just go after the other.

"Shut the fuck up you have never even touched me before!" She cried out obviously not used to dealing with someone who had spent hours on the web, got his mother insulted every day of the week and had no compunction of using said insults on weaker minded foes.

I dodged around her ribbons and thankfully at this point everyone had fled the site of our battle, or they were already dead and crushed within the collapsed buildings surrounding the site of our engagement. Seeing now idiots trying to watch our battle I wreathed my sword in space blades and sent a series of small spatial blades that invisibly cut through all her ribs and took off her arms, but she was able to dodge the one heading for her neck by jumping in the air and losing a leg instead.

With all the ribbons temporarily having to regrow and get past the fire, lightning, and spatial magic I had drenched in the wounds on her body I was able to dash forward and just like Usui when he went to go for the finishing move, I saw Gyutaro wrench himself off Daki's back almost like it was a candle melting in reverse as his decrepit cracked and obviously mutated skin grew off his sister's smooth back.

My sword and Gyutaro's sickles met with a loud crashing noise as I wasn't a mortal demon slayer and rather than diverting or parrying his demonic strength, I met it with my own Falna granted strength and the ground started cratering as our blows shook the very earth and even brought down the still standing buildings around us.

"Finally, you got out of your sister or were you just jealous of our dancing and wanted a turn?" I asked making him twitch and he started muttering as he clawed at his own face, and I could see the sheer insanity in his eyes as the deep furloughs he clawed in his own face rapidly healed.

"Bullying my sister wasn't really nice... You know?" He asked in his rasping voice as he started walking towards me with his sickles starting to glow menacingly red

"Yes, well monster cannibals who think humanity is merely cattle will not receive any mercy whether it's from my words or being turned into ashes to drift away on the wind." I replied and met his approach with my sword wreathing itself in spatial magic and the area around my sword became covered in jagged scars in the air as the sword was cutting through space as I moved it.

"Let us see who the cattle are, and who is the predator..." I muttered and Gyutaro hearing my words gave a light nod as despite his insanity I could tell he was a worthy warrior in his own manner.

The surrounding world exploded violently as Gyutaro sent his Blood Demon Art which was basically large sickles made out of his blood streaming around which could even turn around in the air but the combination of coating myself in flames and lightning while using my blades spatial blades easily negated Gyutaro's complete offensive and our attacks destroyed all interference Daki could even attempt as her ribbons couldn't even approach our battle before being destroyed by one of our stray blows as we threw each other across the redlight district.

Gyutaro had a slight advantage in terms of pure agility, but he wasn't able to remain within my zone of elemental effects as the only time he tried to stab my armored chest with his sickle as his Blood Sickles would only leave gouges upon my armor he was swiftly overwhelmed by the magical fire and lightning literally melting the flesh from his bones and that led to me getting an opening to cut off on his arms and a leg with a slash of my sword sending a spatial blade through the limbs.

I starting to get a little tired from constantly using my magic, so I took a blow to my armored side and grabbed Gyutaro and like Ryuu taught me I pivoted and threw him over my shoulder and as soon as he landed on the ground, I used my adventurer strength to stamp a foot on his chest and with all my strength sudden jerk backwards while pulling and twisting on the arm I used to flip, making him scream as all the tendon where suddenly torn apart and twisted into a bad position.

'Huh so torn and misaligned muscles take a while to heal for regenerators.' I noted absently as Gyutaro had no choice but to manually fix his arm with his other as he jumped backwards but he didnt get a second chance as my dash forwarding slash took off his head which landed onto the ground with a soft thump...

"Big Brother!" Daki screamed and I with a sigh I turned to the obviously distraught woman.

"Alright come on Daki." I said to get her head in the game as I didnt want to kill someone basically being mind broken.

"Kill him Ume!" Gyutaro's voice screamed out from his decapitated head and honestly, I really wanted to study how demons could speak when they were decapitated as they had no air to send through the voice box...

"I can't! Master Muzan save me!!!" She screamed hysterically as she fell to her knees in defeat.

"Ugh this puts a bad taste in my mouth..." I grimaced and then sent an invisible space blade which made Daki choke on her crying as her head slipped off her head and fell into her lap.

I then blurred into motion quickly using the scringe Tamayo gave me to take several blood samples of both Daki and Gyutaro's fading bodies.

I then moved Daki and Gyutaro's head close to one another and sat down beside them. "Alright if you two got any words go ahead and say them before you both head off to hell."

Surprisingly they didnt curse or yell at another as they both knew I was a freak of nature, and it wasn't a couple plucky Demon Slayers trying to kill them. Instead, Daki showed her inner childishness as she was only turned into a demon at thirteen years old and had never physically aged past that point.

"Lord God will be we both really be going to hell forever." She asked me quietly and I realized that they likely thought I was an actual god which honestly to the people of this world I probably was the closest thing they would get to that. Also, if I ever got too bored, I could always play the god card should I go to world like Highschool of the Dead, to seduce the waifus, fairly easily.

"Do you both regret the things you did as a demon? Especially you Ume?" I asked honestly curious and I was right in my thoughts a Gyutaro firmly shook his head as much as he could showing he lived without regrets, but Ume sniffled at my question.

"I had no choice as it was either get beaten to death after that samurai forced himself upon me and I was burnt alive... I didnt want to become a demon! I just wanted a happy life with my brother not a life of being a whore and being abused!" Ume cried out and I patted her on her head.

"It's good to know your lives path... I am not the most familiar with the path of reincarnation but I know for a fact that should you cleanse the soul of your previous attachments and sins you will hasten the process so you siblings can meet in another life." What I said wasn't merely nonsense as this world did have a strong system of reincarnation as shown in the after-story books and also going off what Freya and Hestia told me of how they had to handle sorting out where souls went in Tenkai.

With that said the sibling's face's relaxed being comforted that they would one day be able to see one another again.

Finally, the heads faded, and I was able to secure the remaining pieces of Gyutaro and Daki's bodies within my space ring should I want to fuse them into something or like how I never asked to fuse Ottar's body I could just respect their remains and let them fade in the air.

"Well let's get this blood to Tamayo and then I can go meet Shinobu in Kyoto." I yawned as I still wasn't all to use to this late-night schedule.