One day, the hero's of UA are relaxing and enjoying their summer off of school, when suddenly, during the night time demons attack the UA students as they meet an unexpected group of people.
It all started in an alternate Demon Slayer Universe. A universe where Yoriichi Tsugikuni Became a demon along with Kokushibo. They became the strongest demons to ever exist. Yoriichi Defeated Muzan Kibutsuji in battle and became the Next Demon King while Kokushibo became Upper Moon 1.
Fast forward several hundred years and there is a situation where Tanjiro, Zenitsu, and Inosuke ended up having to fight both Yoriichi and Kokushibo at the same time. "Such fools. Humans thinking they could defeat the Demon king himself. How pathetic" Yoriichi says. "STOP IT! I WILL NOT ALLOW YOU TO LIVE ANY LONGER!" Tanjiro Screamed.
Yoriichi and Kokushibo burst out in laughter knowing that The humans stood no chance in winning. "I'm tired of your nonsense. I will end you here and now" Yoriichi raises up his sword. "Sun Breathing 8th form: Sunflower Thrust" Right before Yoriichis attack hits, Everyone in the whole universe are teleported into a whole new unexplored world. "W-What happened Tanjiro?" Zenitsu Asked. "I-I don't know, I don't even know where we are." He replied. Meanwhile Inosuke is climbing a tree trying to fight the squirrels.
"Hey Deku we should all go to the mall tomorrow!" Uraraka suggested. "O-Oh Uh. Sure!" He replied. Suddenly Deku perked up and sensed a lot of danger but also a lot of peacefulness. "What's wrong Midoria?" Todoroki asked. "I sense So many evil energies but so many peaceful energies at the same time" He explained. "You ever think that your sensing the citizens you dumbass?" Bakugo Said.
"There's no way these energies are citizens, these feel different, a lot different than what I'm used to" He explained. "Why don't we go take a look and see what's going on?" Todoroki Suggested. Midoria and the others go out to check what was wrong and came upon some weird Discoveries. "Who are you?" Deku Asked. "My name is Tanjiro Kamado, my friends here are Zenitsu, and Inosuke over there"
Tanjiro Pointed at Inosuke still in the tree flailing his swords at the squirrels. "What a weirdo" Bakugo said. Inosuke quickly turned to Bakugo. "WHAT DID YOU JUST SAY TO ME?" Inosuke screamed. "YOU HEARD ME!" Inosuke jumped out of the tree and ran towards Bakugo. "COME HERE AND FACE ME!" He yelled. Bakugo dashed towards Inosuke but suddenly Deku and Tanjiro grab Inosuke and Bakugo.
Eventually, they both calm down and Tanjiro finally explains what happened. "WOW! So the multiverse theory really does Exist!" Tanjiro looked confused. "I'm sorry, the multiverse theory?" Bakugo interrupts. "It takes far too long to explain trust me" Bakugo said. "So basically, there are very powerful demons that came here with you?" Deku asked. Once again, Tanjiro looked surprised.
"W-What!? They followed us here!? Dammit. We're in some big trouble" Suddenly, Screaming could be heard from down the street. Everyone instantly gets up and runs to the chaos. "W-What the hell!" Deku exclaimed. As he was standing there, Rui and Enmu were consuming multiple humans at once. "N-No Way! But I killed them! How could they still be alive?" Tanjiro Thought to himself.
"It's good to see you again slayer! I think I'll take my revenge no-" Suddenly, Enmu was beheaded. And behind him was Rengoku. "R-Rengoku..." Tanjiro starts Tearing up. I see you've gotten stronger Young Kamado!" Rengoku said. Right beside Rengoku was Mitsuri, Tengen, And Giyuu. "Who are these guys Tanjiro?" Deku asks. "They are the hero's of our universe. We call them the Hashira. They're the best swordsman of the era." Tanjiro explains.
"When we came to this place, we spotted a few upper moons as well as the Demon king Yoriichi." Tengen said. "N-No. this is very bad!" Tanjiro says. "WHO CARES! WE'LL KILL THEM EITHER WAY!" Inosuke Screamed. "Well Well Well, if it isn't Kyojuro Rengoku" Everyone turned to the side and saw Akaza standing there. "RENGOKU LET ME HE" Deku Interrupted. "No. Let me help. I should be strong enough to defeat him." Deku explained.
"Ok yeah! Could you please help Rengoku Deku?" Tanjiro Asked. "Deku is it? Let us go!" Deku agreed and they ran away leading Akaza away from the others. "I wonder, did that hole in your chest not kill you?" Akaza Asked. "It most certainly did! And yet somehow I am here right now! So let us Begin where we left off!" Rengoku Said. "By the way, my offer still stands Kyojuro, Become a demon and join our side" Akaza Suggested.
"If I said no before, what makes you think that I'll say yes this time" Rengoku asked. "Well I thought that maybe me killing you would've changed your mind, but I guess I was wrong" Akaza Explained. "Do you have experience with this opponent Rengoku?" Deku asked. "I do indeed. He's the one who ran a hole through my chest with just a punch. He's quite a skilled opponent" Rengoku Replied.
Suddenly, Akaza dashed towards Rengoku but before he could do anything, Deku kicked Akaza in the side making him go flying through a few buildings. "Screw Kyojuro, Why don't you become a demon! You will be able to regenerate in a blink of an eye! And be able to surpass the limits of a human!!" Akaza Suggested. "No way. That would mean I'd be a villain. And that's unacceptable!" Deku Replied.
Akaza Sighs. "All you "hero's" think alike. You guys think that being good is everything. When being a hero never gets you anything. Sure you get praise, but that's it, everything you love, eventually dies and wears out" Akaza Explains. "Are we going to fight? Or are you just going to keep stalling" Rengoku Said. Suddenly, Akaza dashed at Deku, right as He was about to hit him Rengoku swung his sword downwards.
"Blazing Universe!" Suddenly Akaza Grabbed his sword with one hand and Kicked Deku in the stomach and then punched Rengoku in the stomach with his other hand. "BLACK WHIP!" Suddenly Dekus Black whip wraps around Akaza, picks him up and slams him down onto the ground. The black whip fades away but Akaza instantly stands back up. "Flame Breathing 1st form: UNKNOWING FIRE!" Akaza sees the attack coming and easily dodged out of the way. "
HAHA! MAN THIS IS FUN! LETS FIGHT SOME MORE!" Akaza Dashes towards Rengoku. "BLACK WHIP!" Akaza sees the attack coming this time and grabs the whips, pulls Deku towards him and punches him in the face making him fly backwards. Akaza runs after Deku and upper cuts him, Jumps up and kicks him back down slamming into the ground.
Deku spits out Blood. Rengoku comes up behind Akaza and cuts off one of his arms. It regenerates instantly, Akaza turns around, grabs Rengokus arm with his sword and dislocates it. Dekus Black whip wraps around Akaza again giving Rengoku time to pop his arm back in place and Dash towards Akaza.
"Flame Breathing: 9th Form RENGOKU!" Akaza breaks out of the Black Whip and Clashes with Rengoku.
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They both scream, both pushing past their breaking point. Suddenly the stalemate comes to an end when Rengoku Slices through Akazas Hands and beheads him. Rengoku falls to the ground in Exhaustion. "RENGOKU!" Deku Screams.
Authors Note: Hey Guys! This is actually for a challenge my friends and I came up with but I decided to post it here anyway.
