(Y/N) (L/N) here, and well, we got Kanna's friend from America spending a Summer with us, Luffy reuniting with his old friend, Uta, me traveling back in time, and fighting Demons with some Demon Corp guys, fighting some evil goat guy, and I'm gettin...
(Y/N): You both might be stronger, but your attitudes, I can't fix. Tanjiro on the other hand, you've gotten much faster!
Tanjiro: Thank you!
(Y/N): Now then, is everyone ready? And- Wait, Tanjiro, you're not seriously going to bring Nezuko are you?
Tanjiro was hiding her in his little trunk.
And Nezuko popped her head out.
Tanjiro: I'm just looking after her.
(Y/N): (sigh) Alright. Since she's a Demon at this point, she might actually know something. Right?
She just put a cute face.
(Y/N): AWWWWW! Okay!!!
As you set out to get the Demon Slayers ready...
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Deep inside Muzan's Infinity Castle, the strongest of the Demon King's warriors had assembled.
Muzan: My strongest of the Kizuki, I have called you here because we have been located. One man has joined up with the Demon Slayers. And Nakime has determined that they are even stronger than the Hashira. I hope you do not fail me.
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Gyutaro and Daki
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Kaigaku
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Gyokko
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Hantengu
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Akaza
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Doma
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Kokushibo
Gyokko: Should we tear him apart my lord?
Daki: Or ... do we get to skin him alive?
Gyutaro: Not without me, Sister.
Daki: Of course, Big Brother!
Kaigaku: I can't wait to test him.
Kokushibo: So would I, my Moon Breathing would be more than enough for him, my Lord.
Doma: I would freeze his skin until he collapses.
Akaza: If he's stronger than any of those Hashira, then I will love a good fight!
Hantengu: What about you, my Lord?
Muzan: I expect the best of you. As for me. I will prepare myself for this battle, when my time comes.
He smiles, and tipped his hat.
Muzan: Nakime, if you would.
Nakime: Of course, my Lord.
She played her biwa and he teleported.
Muzan ended up in a giant flesh cocoon preparing himself for his time to come...
Muzan: He's here.
You used Instant Transmission and so many Demon Slayers, including the Hashira, Tanjiro, Zenitsu, Inosuke, and Kanao.