What if Tanjiro have a fate that he will be the master of Chaldea and Humanity's Savior?
Tanjiro Kamado is the son of legendary Yoriichi The Demon Slayer who hunting down the demons and Muzan the demon king that he was beating the crap out of Muzan...
When Tanjiro with the group of demon slayer members are in the forest by themselves because they know where Muzan the demon king really is and they are going to bring him down once and for all. Then Tanjiro who was stood right there by himself and he need to know that he got all everyone else is here right on the time and it is time to end the demon king once and for all.
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Tanjiro: "Is all everybody here?" He asked them and make them nod their heads.
Tanjiro: "Good, then this time...we are going to end Muzan the demon king and his minions." He said to them and make them nod their heads that they are going to end him quickly and once for all to the mankind's safety. Then Tanjiro know where the demon king really is and he can end him once and for all and make them readying to enter the infinity castle where the demon king is hiding in there.
Tanjiro: "But there is only one thing that we've been kidnapping this demon." He said to them and make the servant appeared and that is Musashi and she is holding the head of the demon and she is sooner to cut it. But the demon was scared as hell that he got all everything cut and rip apart off by the servants who beating the shit out of him badly and now only left is...Tanjiro going to need the demon create the portal for himself and make the portal appeared out of nowhere and then Tanjiro with the other demon slayers and Servants hop inside by themselves.
They both were falling out from the sky to the portal and turns out that Tanjiro with the others finally found the secret place where Muzan and the rest of the demons were living there by themselves and seems like they both have no idea what's coming for them.
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The Infinity Castle (異い空くう間かん無む限げん城じょう Ikūkan Mugen-jō?) is the primary location of the Infinity Castle Arc. The Blood Demon Art and domain of the Biwa Demon Nakime, it is a vast extra-dimensional space that serves as the lair of Muzan Kibutsuji.
The Infinity Castle is an alternate dimension consisting of endless wooden rooms, halls, and moving corridors. It possesses a warped direction of gravity, allowing demons to stand upright, upside down, or perpendicularly on the walls, or move in physically impossible directions. Its unusual structure and layout as Nakime's Blood Demon Art allows any structure within to shift at her will, though the castle additionally also seems to move on its own.
Using her biwa, she can manipulate the position of any demon inside and take them to any location in her range. During the conclusion of the Lower Ranks Meeting, Nakime teleported Muzan to a balcony leading outside despite his original position being deep within the castle; moreover, the doors she used to close around him all seem to constantly shift within the unusual gravity, spinning within themselves as she changes its layout.
When they both were land down on the ground and make them were turn their heads to look around and they saw all everything was quiet and then they both can sense there were many demons are here in this world. Then Tanjiro take his golden katana dragon sword out and make him was gripping tightly the weapon and he was prepare to fight and killing those demons.
Tanjiro: "Alright, we are here now...let's do this." He said to them and make him was summoned all the servants and they both are here right on the time and they got their appearances to show themselves.
Charlemagne, Illyasviel von einzbern, Miyu edelfelt, Kukulkan, Medea, lrisviel (dress of heaven), Rama, Sita, Ozymandias, Marie antoinette, Marie antoinette alter, Tezcatlipoca, Circe, Nagao kagetora, Takeda shingen, Aozaki aoko, Atalanta, Scathach skadi, Alice kuonji, Soujuurou shizuki, Tenochtitlan, Barghest, Melusine, Britomart, Archertype earth (arcueid brunestud), Brynhildr, Sigurd, Siegfried, Kriemhild, Sieg, Kiso yoshinaka( fate samurai renmant), Zhou yu(fate samurai renmant), Katsushika hokusai, Abigail williams, Yang guifei, Yu mei ren, Cleopatra, Osakabehime, Artoria caster, Gareth, Percival, and the rest of other servant are here by themselves.
Tanjiro: "Alright, ladies and gentlemen...you all know what to do...let's kill them all...Kill All Every Single Demons!!!!!!!!!!!!!!!! In this castle!!! They won't know what's coming for them!!!!!!!!!" He shout out to them and make them nod their heads and they let out their war cries and here comes the real battle.
Hashiras: "*He's one truly insane.*" They thought themselves.
