As the explosion happened, Tanjiro screamed out for Jason as he couldn't do anything but watch as they ran away till they couldn't see the damage or the train as the dust rose up. There was a clash of 3 blades as sparks flew out from the strength of their clashes as they both then disappeared and reappeared everywhere, once blocking and parrying each other's attacks, both trying to get a hit in as Neo yelled out.
"WHAT HAPPENED, JASON? I THOUGHT YOUR WHOLE KIT WAS TO BE FAST, AND YET YOU'RE STRUGGLING TO BLITZ ME, A MERE UPPER RANK 2, AND YOU'RE DREAMING ABOUT KILLING THAT MAN!? DON'T MAKE ME LAUGH!"
Neo laughed in excitement as his flame-covered blades wouldn't be able to melt Jason's blade due to them being made out of Nichirin as they both clashed again as Jason spoke out.
"So you really want to die that badly, huh? Very well, then, I'll give you a quick, painful death, you damn traitor!"
Jason exclaimed before he felt a sharp pain as he was knocked back with a slash to his right shoulder as Neo just chuckled and spoke.
"Such a shame you've grown weaker, dear brother. Were the bodies of Hantengu and Gyokko not enough to get the rust out of your body?"
he grinned as all 8 of his eyes locked on Jason who just chuckled and stood still with his blade still in hand and Infront of him as he then disappeared from Neo's peripheral vision as he was confused and looked around only to find that Jason ran away from the fight as Neo gritted his teeth in anger and let out a mighty roar as flame dragons flew everywhere hitting the train and making it explode even more as he then felt a sharp pain on his neck as it was Jason now bandaged up and with the bandage wrapping tightly around his shoulder and making sure the blade doesn't get lost as Jason would be half way through his neck in one swing as Neo then slashed down at him only for him to miss and hit wisteria bombs as they explode poisoning him Neo coughed as Jason tried to push his blade further but stopped as he felt something grab him. He was in shock as Neo grew 2 extra arms and pulled out his arm and threw him away before performing
"Breath of dragon, seventeenth form, fire plume"
He slashed upwards, creating a dragon made out of flames as Jason avoided it, barely getting his chin slightly grazed as Neo laughed and took a deep breath as he stomped the ground and raised his 2 blades above his head as he then made 2 blasters out of his flesh as he then used
"Breath of dragon eighteenth form: flaming bullets!"
He shot out 6 fire-like bullets with pinpoint accuracy and extremely quickly, as the bullets only met Jason's blade and his quick movements as he sliced away the bullets as Neo then exhaled flames and stared at Jason as Jason disappeared from his sights as he tried to go for a downward slash only to be met with a flame storm as Neo used
"Breath of dragon, seventh form: Chaos dragon wrath"
He shoots out countless shots of flames from his right gun as he then slashes everywhere, creating dragons that explode into flames as Jason was hit by one of the dragons and flew backwards and slowly fell down on the ground as he looked around in shock as to where to land safely, as the only thing he saw were dead ends before chuckling as he would then use
"Lightning breathing first form: lightning strike"
He crashed down quickly as he slashed downwards, meeting with Neo's blade as they clashed blades. Jason was heavily injured as he then pushed Neo to the ground and disappeared again as Neo growled in anger as he used
"Breath of dragon, 10th form: dragon scales!"
He created a large fire dragon on his blade as he made the dragon cover him up entirely as Jason felt the heat from the other side of the train that had exploded as he tried to regain his bearings and then unsealed a packet and looked at it before smirking as he disappeared once again, this time appearing in front of the large dragon Neo had conjured up as he threw 5 wisteria bombs at the dragon as they were sliced apart and exploded, making the dragon disappear due to the explosion as Neo just growled and performed a horizontal slash with a dragon following his slash.
"Breath of dragon, 17th form: fire plume!"
His slash only met up with 5 more wisteria bombs as they exploded in his face, weakening him even more as he coughed out blood and stumbled back as Jason performed a counterattackas he charged at him. As Neo saw this, he sliced down at him only to miss and hit 3 wisteria bombs that exploded in his face as Jason would then use
"Breath of lightning, fourth form: lightning step!"
as he dashed towards him and fake slashed him once as Neo tried to go for a slice only to hit air as he got sliced from the back as Jason kept going back and forth, switching sides from slicing in front and back, as Neo then let out a ground-shaking roar as he felt his life deteriorating as he then summoned multiple blades out of his body as dragons flew everywhere as Jason was shocked and sliced down at one of the dragons as they exploded and sent him flying back into the train from the forest they were currently fighting in as Jason coughed out blood as Neo took heavy breaths as he seemed mad and annoyed as he then performed the final blow.
"Breath of dragon, 10th form: dragon scales!"
He surrounded himself in a flaming dragon before he raised his blades up in the air and sliced down, sending the dragon he conjured up straight at Jason, who saw it flying at him at lightning-fast speed as he could do nothing but brace himself as he had the wind knocked out of him by the force of the previous attack. As the dragon got closer, it just disappeared as Jason was confused as the sun Slowly rose in the sky as Neo saw this and ran away deeper into the forest and was eventually summoned back into the infinity castle.
[The return to the infinity castle]
Muzan stared down at him while Neo was seething in anger, hitting the floor in frustration as he let out a mighty roar as Muzan silenced him by slicing his lower jaw apart. As he then noticed Muzan, he got on all fours and bowed down to him as he regenerated his jaw and then spoke.
"Greetings, Lord Muzan. I sincerely apologize for my behavior. I was just frustrated, for I was extremely close to finishing off the Hashira and almost finished off the kids as well."
He kept his head low as Muzan sighed in disappointment before speaking.
"You're the upper rank 2, and yet you were stalemated by one single Hashira. Kokushibou would've gotten rid of the Hashira in an instant and the kid's no wonder you're still in upper rank 2 and lost to him. You're getting weaker and weaker by the day, Neo; you're becoming like Akaza, irrelevant to my plans."
As Neo heard these words, he trembled in fear, as he knows if Muzan doesn't find him of any use, he can be killed this instant as Muzan pointed his finger towards Neo and then spoke.
"Although I must commend you for that, Hashira, your brother had greater potential than you and still had more experience; he only won by his experience, and that too by a sliver. I won't kill you, but I will punish you."
He made Neo's body crack into many pieces as he started trembling and coughing out blood as Muzan's blood demon art, black brambles, covered his body as he was basically being tortured but wouldn't let go and wouldn't say a word as he was lifted up by the blood demon art and bled out more and more as he will take his revenge on Kokushibou and Jason as he hung there for 20 minutes before being let go as Muzan got bored of him not screaming as Neo dropped down and stared up at him as Muzan just looked away and turned his back on him.
"Heal up your wounds; you look pathetic, and if you want a rematch with Kokushibou, we'll do it for your 19th birthday as a gift from your lord and savior."
Muzan then disappeared as Nakime stared at him and sighed and spoke.
"Lord Neo, are you ok? Do you need some comfort? You're still younger than all of the Kizuki, including Daki and Gyutaro, the youngest of the Kizuki. You're only 18 in demon years and 17 in human."
Neo looked up at her as he was reminded of his mother comforting him every time Jason bullied him, and he regenerated and hugged her tightly before smiling.
"This is nice; thank you, Nakime. You're the best...."
Nakime patted his head and comforted him as if he were a child, and he enjoyed it. As he heard steps coming closer, he stopped hugging Nakime and looked around; it was Akaza, the one demon he didn't expect. As Akaza looked at him in annoyance, he said,
"Hey, newbie, want to go hang out and kill slayers later in the night?"
Neo heard this and was surprised as he hid behind Nakime, as Nakime was now scared, and then Neo spoke teasingly.
"What the fuck? Who are you, and where's the Akaza? I know he's not this kind; that's something Douma would say!"
Akaza got annoyed and tried to punch him, only for his arm to get sliced off by Neo as he stared at him with a cold look in his eyes and grabbed his arms.
"Listen here, Akaza. I'm not like Douma; I won't hold back if it means disciplining you into fearing my might and power. I will not call you lord. Akaza, like Douma, I have respect for myself, and I will make you call me lord. "Neo, even if it means challenging you 1000 times in a battle to one-shot you and make you understand that you can't stand to anyone of my caliber or higher, you understand me, don't you, Akaza?"
Akaza stared at him and just gritted his teeth and went for a headbutt, only to be sent flying into the wall by a kick to the gut as Akaza coughed out blood from the impact of the kick as he stared at him and was in shock at how a skinny figure like his could pack such a punch in one blow as Neo pulled out both his blades and covered them in flames.
"Akaza...I will not repeat myself. I am here to help Lord Muzan and not tolerate disrespect from you."
He pointed his sword at him as his eyes glew a bright orange as his draconic pupils expanded as Akaza stared at him in anger still gritting his teeth in anger as he pulled himself away from the wall and charged at him going for a kick only for his leg to be sliced in half as he was sliced in half from the waist as his torso floated in the air as Neo performed a round house kick to his ribs sending his Torso flying back to the wall as Akaza controlled his leg to attack him only for it to be sliced into bits and burnt away as Neo sent a small dragon Charging towards Akaza as it hit and exploded leaving akaza near deaths door as akaza couldn't Regenerate as Neo exhaled letting out steam from his mouth as his face was covered in darkness only his eyes and the steam was visible
"Know your damn place, you weak excuse of an upper rank. I bet that even my older sister could beat you without much of a sweat, and she's still not a hashira."
He walked back to Nakime as Nakime stared at him in fear and shock as Neo sighed and smiled.
"Send me to Daki and Gyutaro's place, please."
Nakime nodded and teleported him to the entertainment district as he was teleported in front of Daki.
[The entertainment district]
She looked at him in annoyance before noticing his eyes and who he is as she backed up.
"U u u upper moon 2!?! "W-W-Where's Lord Douma?"
She was terrified now as Neo stared at her as she was still standing as he chuckled and said,
"On your knees this instant."
Daki was shocked at what he was saying as she refused, only for her legs to be sliced apart as she fell on the ground in pain as her regeneration was slowed due to the flames as Daki stared up at him in fear as her eyes teared up as she would call out.
"ONIIIIII CHANNNNNN!!!"
As Gyutaro slowly got out of her body, he looked annoyed and saw the build of a boy, and he got even more annoyed as he didn't look up at him before he felt a menacing aura, which made him drop his sickles and get on his knees and bow down to him as Neo stared at them.
"Oi, Gyutaro, teach your sister some manners and to bow down to someone stronger than her."
Gyutaro nodded as he started thinking.
"Shit, who is this guy? He doesn't have Muzan-sama's voice, but he has the same aura as him."
Gyutaro looked up at him as he saw Neo eye to eye as upper rank 2 was on his eyes as Gyutaro was shocked and started apologizing as Neo just grabbed him and threw him outside the room and locked the room and looked at Daki and kneeled down to see her eye to eye as he slowly regenerated her legs as she stared at him as he sighed and picked her up princess style as she was confused as Neo spoke out.
"I like you; why not become my personal assistant?"
Daki was confused before realizing She was surprised at the offer.
"So? Have you decided yet, Daki?"
Daki just nodded; she started thinking about what was going on, and why couldn't she stop herself from agreeing? Neo sighed and hugged her tightly and sat down and put her on his lap as he cuddled with her as Gyutaro entered the room and just smiled as his sister was now safe from everything except Muzan. As Neo kept cuddling with her, he fell asleep on her shoulder as Daki was surprised as Gyutaro then thought,
"So he's still getting used to his demon body; he still has some human traits left, like not unlimited stamina, but still, he's so young and already an upper rank. This guy must be strong as hell and has the potential of someone like Lord Kokushibou."
He sighed and closed the door behind him and just sat there thinking about something as Daki and Neo kept cuddling as Daki patted his head and played with his hair while he slept with his head buried on her chest.
[A bad dream]
He was now in a dream where he was a young boy again as he ran to his mother.
"Mom! Mom! I missed you!"
He was met by a push as he fell on his back as he looked up at her as she looked terrified and disgusted at what she saw as she was looking down at him as she said,
"My son would never do something like this. You're not my son; you're now only a monster."
As Neo heard these words, tears formed up in his eyes as he woke up with a yell to his mother. Daki stared at him in surprise as Neo looked embarrassed and coughed.
"Apologies for that; I just had a nightmare."
He got up and stared at Daki before sending Gyutaro out on a mission to try and find the blue spider lily while he and Daki had some fun. After 20 days, he was seen leaving her room as Daki was surprised as she began throwing a tantrum; she had lost at card games for 20 days straight. The scene then shifted to the girls in the building as they just stared at him and blushed as Neo walked away as they peeked inside and just giggled at the sight of the annoyed Daki. As the scene shifted to Jason, who was recovering from his wounds, as he went outside, he was then asked out by 3 junior slayers, all 3 girls.
[A harem? Training first]
One of the girls had blonde hair with red eyes, the other had blue eyes and red hair, and the last one had white hair with green eyes as he stared at them and blinked twice as they introduced themselves, with the blonde one going first.
"Apologies we didn't even introduce ourselves. I'm Lilith."
The red hair went next.
"Nice to meet you, Lord Jason. I've been wanting to talk to you ever since you saved me on that train. My name is Lucy."
The white hair went next and said
"An honor to meet you, Lord Jason. I'm Yuki."
they said with a bright smile as Jason stared at them in shock and disbelief as he face-palmed and tried to make them understand something.
"You're trying to find love in the demon-slaying job? You are aware how stupid that sounds; not even us Hashiras know who we're going to fight and if we're going to live to see the next day."
as the juniors were still persistent as he sighed and agreed in annoyance as he then went to his private area and Started training hard doing 300 push ups with weights on his chest and with his girls on his back as he did push ups then did 300 sit ups with 1 girl sitting on his laps as he did his sit ups as he started getting annoyed and a 10 meter run carrying all three of them while running with weighted clothing and a weight bound to his legs to lower his speed to get faster when he runs normally as he would then do 1000 one finger push ups with the girls still on him and did 120 set of dumbbell curls with each arm on the daily as the scene shift to Neo also doing the same training but this time he was bench pressing daki alongside gyutaro and akaza Who was embarrassed that he was being used as a bench press.