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Within the Evil Capital, Evil sat proudly upon his throne in his throne room, doing absolutely nothing except sitting there. By his side was the mighty Leviathan, who looked at Evil with an unamused stare.
"This is really all you do?" Leviathan questioned, now more awake.
"Of course," Evil said with a smug smile. "As ruler of the world, I must assert my dominance by being here on my throne."
Leviathan didn't seem to enjoy that answer, especially considering what he was asked to do. Deciding to make this a moment for a lesson, Leviathan spoke up. "If you wished to assert your dominance, why not go around the world and enforce your rule? Make an example out of people and show what will happen if people try to disobey you, or attempt to overthrow you."
"So I should kill the Pro Heroes?" Evil asked Leviathan, looking up at him now curiously.
"I'm sorry, Pro Heroes?" Leviathan questioned.
"Yeah, the government sanctioned heroes," Evil answered, somewhat surprising Leviathan.
"This world concerns me," Leviathan remarked, having a vague idea of how that likely turned out.
"Evil," Ainz Ooal Gown called out, walking into the throne room with his follower Demiurge behind him. "There are people who have shown up seeking an audience with you."
"The bipedal sheep also have katanas," Demiurge added. "Although one of them has two blades connected by a chain." Demiurge seemed annoyed the more he thought about it. "If it weren't for Lord Ainz's intervention… I would've given them an audience with Death."
"Bipedal sheep?" Leviathan asked, confused and taking that quite literally.
"He means humans," Ainz explained to Leviathan.
"Even your followers are crackheads…" Leviathan groaned as he pinched the bridge of his nose. "You people make no sense."
"Bring them in," Evil said to Ainz with a hum. "I can't wait to see who the first of likely many people to seek an audience with me are…"
After Ainz gave a nod, he went and fetched the two humans who had wished to seek an audience with Evil. With Demiurge now by Evil's side, Ainz had brought in the two humans, both of whom were men, and also swordsmen.
"So, you are the ruler of the planet?" the first of the humans said, wearing a haori with a white-yellow gradient pattern and red flame-like ridges at the end, with a katana on his hip.
"That is correct," Evil said. "You two gentlemen are?"
"My name is Kyojuro Rengoku," the first man said.
"And I am Tengen Uzui," the second man added as he introduced himself. "We are Demon Slayers of the Demon Slayer Corps."
This made everyone in the room silent, several of the key figures baffled by the fact they so openly claimed to slay demons. Evil shifted in his seat, baffled. "You… do realize I am a Demon God, right?" Evil asked.
"So we've heard," Rengoku replied, his arms crossed.
"Lord Ainz," Demiurge began, adjusting his glasses as a hint of irritation entered his voice. "If I get the approval of Lord Evil, may I personally kill both of these fools?"
The Overlord let out a sigh. "Great, now Demiurge is pissed," Ainz remarked. He looked at the Demon Slayers and said, "You better have a great reason for coming here now."
"We do," Tengen replied, holding his hand out. "We require your assistance in dealing with the Demon the Demon Slayer Corps has been hunting for centuries."
Evil tilted his head to his left. "Go on…"
"We come from Japan," Rengoku said. "Specifically the Taishō era Japan that has appeared within this world."
"Hold on," Ainz began, surprised by this news. "There are multiple Japan on this planet?"
"From what we gathered, yes," Tengen confirmed with a nod. "There is the Taishō era Japan, that modern Japan with those superpowered humans that we mistook for Demons, and then another Japan that is relatively void of said people with some exceptions."
"In our Japan, we are hunting a Demon known as Muzan Kibutsuji, the King of Demons," Rengoku explained. "We have struggled for centuries, and many Demon Slayers have been lost in this conflict." Rengoku looked at Evil intently. "With your rule being established, and us hearing that many of the world's villains were a part of your army, we had hoped this meant Muzan would be dealt with… but we were wrong. We've still had to hunt Demons during this time, which is why we're here to learn whether or not Muzan Kibutsuji is a part of your army, and if you could possibly call him off from attacking the innocents of Japan."
Evil considered Rengoku and Tengen's request. "Hmm…" Evil sat up now, crossing a leg over the other. "Ainz."
"Hmm?" Ainz looked up at Evil. "Yes?"
"Do we have anyone by that name as a part of our army?" Evil asked.
"I can't say off the top of my head," Ainz said. He looked at his follower Demiurge. "Demiurge, can you go get a record of all the inhabitants of Evil's army, double check for that name?"
"Of course Lord Ainz," Demiurge replied with a bow, before walking off to get that record.
"Describe Muzan to me," Evil said as he looked at Rengoku and Tengen.
"He is known to take many appearances," Rengoku explained. "He doesn't have a form per se, but he is human as are most of the Demons that we slay."
Tengen nodded. "These Demons were also once human, but they were turned due to Muzan's blood. He is the progenitor of all Demons."
"HA!" Leviathan laughed, amused while startling everyone in the room by his sudden outburst of laughter. "HAHAHAHAHA!"
"What's so funny?!" Tengen questioned, confused by Leviathan's laughing.
The mighty Leviathan continued laughing and even began holding his sides from how absurd it was to him. Everything they said was both a mockery and yet the biggest possible joke ever to be told. "It's just so rich!" Leviathan declared as he looked at Tengen mockingly. "A human could never be a real Demon!"
"Muzan Kibutsuji and the demons he makes beg to differ," Rengoku argued. "They may not have come from Hell, but they are certainly not human."
Leviathan rolled his eyes. "Well let me tell you…" Leviathan smiled ominously. "You know nothing about the Demons of Hell…" Rengoku and Tengen were deeply unsettled by Leviathan's words and smile.
Evil gave a shrug. "So, how do we find this Muzan Kibutsuji?" Evil asked curiously, looking at Rengoku and Tengen.
Leviathan looked at Evil. "You intend to search for him?" Leviathan asked, curious and surprised.
"Yes," Evil said. "After all, he and his Demons are better used as being a part of my army as I lead them against Lego's in the fiery battle to be had!" Evil smiled as he laughed maniacally.
Tengen and Rengoku looked at each other for a moment. "We… just unknowingly gave him more recruits, didn't we?" Tengen asked.
"We did," Rengoku said in realization. "...shit."
It was at this time that Demiurge walked back into the throne room, purposely walking into Rengoku and shoving him into the ground as a result. "Lord Ainz, I have looked through the records and found that we do not have a Muzan Kibutsuji as a part of the army," Demiurge said while Rengoku stood back up.
"Thank you Demiurge," Ainz said. "You are dismissed for the time being. Go to the basement and work on Evil's little… side project, please."
Demiurge nodded and bowed. "Yes Lord Ainz," Demiurge replied, before walking off once again.
"Side project?" Leviathan questioned, looking down at Evil.
"Unimportant for right now," Evil said standing up. "It is time for us to travel to Japan and make Muzan Kibutsuji submit to my will!" Evil then began to laugh maniacally.
Leviathan crossed his arms and looked down at Evil. "...well, it is what I suggested," Leviathan remarked to himself.
In the Taishō Era Japan, inside of the Ubuyashiki Mansion, Evil, Ainz, and Leviathan had gathered, alongside the Hashira of the Demon Slayer Corps, as well as their leader, Kagaya.
"I thank you for your assistance," Kagaya said to Evil, not looking directly at him.
Evil looked weirded out, seeing the curse mark that coated the upper portions of his face. "Are you okay?" Evil asked, something that seemed to surprise the Demon Slayers, Ainz, and even Kagaya and Leviathan.
Kagaya paused to consider Evil's words, before saying, "No. I am cursed." Taking a small breath, Kagaya explained, "My family is cursed due to our relation to Muzan Kibutsuji himself. All boys born into the Ubuyashiki Clan will die without surpassing the age of 30. Girls born from the clan must be married off and change surnames by the age of 13, otherwise they will also inevitably die from accidents or illness."
"Wow," Ainz remarked. "That's… surprisingly brutal."
"So this so-called 'Demon'... do you have any idea on how to find him?" Leviathan asked, getting straight to the point.
"The best hope we'd have is to find a Demon," Kagaya explained. "Specifically one of the Twelve Kizuki, the highest ranking Demons under Muzan's command…"
"Why not use Tanjiro?" Giyu asked. "He has plot senses."
"He's busy with Demon Tamer," Kagaya remarked, referring to one of the author's stories, one of which was still waiting for more chapters.
"What?" Evil questioned, not understanding the reference.
"Perhaps we could track him through other means then," Ainz suggested. "Perhaps we could locate Muzan via using your blood?"
"Are you capable of that?" Kagaya asked Ainz.
"I… don't think so," Ainz admitted. "What about you Evil?"
"Beats me," Evil replied. "Leviathan, can you track Muzan via Kagaya's blood?"
"I can," Leviathan said. "I'll need a sample."
Kagaya nodded and held out his arm. "That is quite- ough!" Kagaya gave a vicious cough, coughing blood onto his arms.
"Oyakata-sama!" The Hashiras said in unison, each getting close to him.
Leviathan took some blood from Kagaya with a hum, sensing what little time the leader of the Demon Slayer Corps had left. After a moment, Leviathan pinpointed the location of Muzan. "Found him," Leviathan stated.
"Where?" Evil asked.
"In a sub dimension," Leviathan commented. "Hmm, that's one place to hide."
"Then that must mean we have a chance to find him," Evil stated. "Alright, let's get going. I wish to see what this Demon is about."
"I want to come with," Rengoku said, approaching Evil, Leviathan, and Ainz. "I still wish to defeat some of the Demons. They've killed too many innocents for me to idly stand by."
"I want to come as well," Tengen stated. "We ride together, we die together."
"Fine by me," Evil said, catching Leviathan and Ainz off guard.
"You do know they are just humans, right?" Ainz asked Evil.
"So what? They've managed to get this far. I'm sure things will be fine if we let them tag along," Evil said with a smirk. "Plus, we need them to confirm we found the dude we're after."
"Did I not just track him down?" Leviathan questioned, glaring down at Evil incredulously.
"Well, in order to kill these Demons, we do need to expose them to either direct sunlight, or to decapitate them via the use of a Nichirin blade," Tengen explained, before showing his Nichirin Cleavers. "All Demon Slayers have one, but some of us have modified blades to go with our styles. That, and some of us just have unique weapons entirely."
Ainz rubbed his chin as he looked at the cleavers Tengen held. "Are those that effective in combat?" Ainz asked.
"Of course!" Tengen answered with a flamboyant smile. "I have outstanding thumb strength."
"Tengen here is also a Hashira, meaning he's one of the top members of the Demon Slayer Corps," Rengoku replied, a smile of his own donning his face. "He's killed over 50 Demons to become a Hashira. I myself am the Flame Hashira, though I inherited my rank after proving myself against a member of the Twelve Kizuki in a spin-off manga."
"Oh, so we're just fourth wall breaking now?" Leviathan questioned.
"With the backstory out of the way," Rengoku began. "We can hunt down Muzan."
Leviathan rolled his eyes, not impressed by these humans. Evil on the other hand was a bit excited. "Well then, let's get this show on the road," Evil said, before turning to look at Leviathan. "Leviathan, can you lead us to Muzan please?"
The serpent in human form merely let out a hum. "Very well," Leviathan said, before tearing a hole through the space in front of them, opening a portal to an odd Japanese castle-like domain.
"The heck is this place?" Evil questioned, raising an eyebrow as he stepped through the portal, and then falling due to a lack of a solid surface below where the hole was ripped.
"Did you just kill him?" Tengen questioned, looking at Leviathan with a baffled expression.
"He can fly," Leviathan and Ainz replied.
"I can fly!" Evil declared as he flew in front of the portal on the other side.
After successfully infiltrating the domain, the Demon Slayers and their plus threes were met with two mindless Demons, to which Rengoku and Tengen drew their blades.
"These are the Demons we talked about," Rengoku remarked as he took his stance.
Leviathan once again didn't seem impressed. "They're just humans."
"They feast solely on the blood and flesh of humans," Tengen reminded. "And they have Blood Demon Arts."
"Blood Demon whats?" Ainz asked, before one of the Demons sprouted wings and the other looked to be developing frostbite.
The two rabid Demons then rushed forward without instinct. Tengen readied his cleavers and charged forth, instantly decapitating the winged Demon without much effort. While also charging forward, Rengoku on the other hand readied his blade to strike.
To Evil's surprise, he saw Rengoku's sword catch fire as he heard Rengoku shout, "Flame Breathing Fifth Form: Flame Tiger!" Swiftly charging forth with the flames taking the shape of a tiger, Rengoku also decapitated one of the Demons with the brilliant blaze of the flames.
"Oh my," Evil said, surprised and impressed by the sudden manifestation of flames.
"Flame Breathing?" Ainz asked, confused and interested.
As Rengoku sheathed his sword while the Demons turned to dust, Tengen said, "All Demon Slayers use breathing techniques to fight Demons. Flame Breathing is Rengoku's style."
"How do these Breathing Style allow one to manifest an element though?" Evil asked. The Demon Slayers and Evil's advisors looked at him, confused by his statement, with Ainz looking a bit concerned.
"I beg your pardon?" Rengoku asked, raising an eyebrow.
"What?" Evil questioned, before looking at everyone. "Why is everyone looking at me like I'm crazy?"
"You are," Leviathan said bluntly. "He never manifested flames."
"I may have visualized it, but I absolutely have no ability to manifest flames," Rengoku stated. "Though I did hear rumors of someone capable of giving superpowers like that."
"That would be All For One," Evil explained, crossing his arms.
"You need to sleep," Leviathan told Evil bluntly, making Evil turn and face him.
"I have been sleeping!" Evil said as he looked up at Leviathan. "From 9 PM to 5 AM, with some exceptions!"
"And clearly, it's not enough," Leviathan retorted, unamused.
As the two argued, Rengoku and Tengen both looked at Evil with curiosity and confusion. 'How is he capable of seeing the visualization of Flame Breathing?' Rengoku thought to himself. His thoughts were interrupted by more rabid Demons showing up to attack them.
"En garde!" Tengen shouted as spun his chain attached cleavers around rapidly.
"Quick question," Ainz began. "Would the Demons potentially be immune to instakill skills?"
Rengoku and Tengen looked back at Ainz, confused. "What?" They both asked, before the Demons fell like puppets with their strings cut off.
"Conclusion," Ainz began. "No."
"Witchcraft!" Tengen shouted, before receiving deadpan stares from Leviathan and Ainz. "...oh right."
Evil pulled out a sword and after pointing forward declared, "Onwards, to the slaughter!"
After navigating the bizarre castle with its odd gravity fields, winding paths, and repetitive layouts, the group finally made it to a large open area of hovering platforms, where a man dressed in a fine three piece suit was doing alchemy on a table. In front of the man were seven Demons, who each turned to look at the newcomers.
"That's him," Leviathan said calmly as he crossed his arms and looked at the man who was performing alchemy. "That's Muzan Kibutsuji."
The man identified as Muzan looked up from his alchemy set and glared with murderous intent at Leviathan. "Who the hell do you think you are, muttering my name out of your mouth?!"
"That is my advisor, Leviathan," Evil declared. "And I am Evil, the ruler of the world!" Evil looked up at Muzan and said, "It has come to my attention that you are a villain of this country, and I am here to rightfully offer you and your Demons a spot in my army considering your extraordinary abilities."
"Wow, straight to the point," Tengen remarked.
"You don't think he's gonna turn on us after this, do you?" Rengoku asked Tengen, making the Sound Hashira's eyes widen in panic.
"So Muzan Kibutsuji," Evil continued, "what say-"
"Offer me a spot in your army?" Muzan questioned, his voice sounding nothing but hostile as he glared at Evil, the alchemy set on his desk shattering as he glared down at the Demon God. "Do not think you are above me! You are below me in every step of the way you crass fool!"
Evil was surprised by Muzan's harsh words and instant refusal. "What?" Evil questioned, pure disbelief in his voice.
"Upper Moons, kill them!" Muzan ordered, before running off.
"Oh so he's a coward," Leviathan remarked as he watched Muzan run away.
"Quickly, we can't let him escape!" Rengoku shouted as he drew his sword.
"I know what his energy is like," Evil said. "I can teleport to him whenever now, especially once we take out these fools." Evil was then attacked by the obi sashes that came from Upper Rank 6, Daki.
"Don't call me a fool, you ignorant man!" Daki screeched as she attacked him. Tengen attempted to rush Daki, but was attacked by the other Upper Rank 6, Gyutaro.
"Eyes on me Hashira!" Gyutaro shouted at Tengen, attacking him with his dual kamas.
Rengoku readied his blade as he was attacked by Upper Rank 3, Akaza, who was quick to attack the remaining Hashira. "Show me your strength!" Akaza shouted with glee as he fought Rengoku.
"Ya know, I should probably end this," Ainz commented as he stood next to Leviathan.
Before Ainz could stop time, Evil shouted, "No, not yet!" Evil after redirecting Daki's sashes, teleported behind her and slammed his foot into the back of her head and into the wall of one of the buildings within the Infinity Castle.
"What?!" Ainz questioned. "Why?!"
"Because I believe these Demons can be of use, even if their master will not," Evil answered. "Save True Death for later!"
"You're batshit insane," Ainz remarked, before getting blasted by a bolt of lightning from the Upper Rank 4 of the Demons, Zohakuten, who stood above Hantengu.
"Also, I'm here now," Zohakuten stated before Ainz flew back to try and put some distance between him and Zohakuten.
"We're all gonna diiiiiiieeeeeeeeee!" Hantengu cried out.
Leviathan groaned. "I swear, this world is nothing but a pain," Leviathan muttered to himself, pinching the bridge of his nose, before getting blasted in the face by a spout of water by Upper Rank 5, Gyokko.
"I LIKE POT! YOU LIKE POT?!" The Upper Rank shouted loudly as his hands turned several pots.
"And now I'm dealing with a pothead!" Leviathan shouted, irritated by Gyokko's shouting about pot.
"WRONG POT!" Gyokko shouted before blasting Leviathan with water from the vases in his hands.
As Evil fought Daki with a regular katana, he deflected several of her obi sashes repeatedly. "Of all things, why these?" Evil questioned, as he grabbed one of the sashes and tugged on it in an attempt to drag Daki forward, though instead the sash ended up getting longer.
"Shut up cretin!" Daki shouted. "You have no place to question how I fight and what I use!" Her obi sashes continued to lash out at Evil, and eventually snapped his sword in half due to the ordinary properties of it.
"...hmm," Evil hummed in acknowledgement, before resorting to purely dodging her attacks for a moment, and even getting a rhythm going.
"Stop that!" Daki shouted, pissed off that he was dodging her attacks so effortlessly.
"Fine," Evil replied, before putting two fingers to his forehead and teleporting, surprising Daki before she turned around and was met with the sight of blue flames in Evil's hands. "Burn and be a kindling for my flames."
The hysterical scream of being burned by Evil's flames were heard throughout the Infinity Castle, with Gyutaro even turning and seeing Daki getting burned by Evil. Pure anger shot through his eyes at the sight, but before he could intervene, Tengen slashed at him with his weapon and drew blood. "You're messing with the God of Festivals!" Tengen shouted.
Gyutaro glared at Tengen, before the blood from his body shot out like projectiles and began to attack Tengen, keeping him occupied as he lunged towards Evil. Evil detected Gyutaro approaching him, before holding his hand up as Gyutaro brought his sickles down, piercing Evil's hand.
"Your fight is with Tengen," Evil told Gyutaro with a glare, before noting that his sickles were coated in poison as he felt the poison enter his system. "Oh my-" Evil was silenced by Gyutaro kicking him in the head and stunning him slightly, before the highly burnt Daki's sashes pierce him in the stomach and sent him through a wall and then proceeded to drag him through several rooms of the deranged space.
Rengoku on the other hand was having a hard time dealing with Akaza, who was managing to overpower him in both endurance, strength, and speed. "You're powerful!" Akaza told Rengoku. "You should become a Demon!"
"NO!" Rengoku shouted.
"YES!" Akaza shouted back, before a stray fireball from Ainz hit Akaza in the back, giving Rengoku an opening to jump back and attempt his ultimate move.
"Flame Breathing Ninth Form, Esoteric Art: RENGOKU!" Rengoku shouted, before lunging forward. Evil, who caught a glimpse of the attack while being dragged through walls and buildings saw the flames from Rengoku's attack once again, this time taking the form of a Japanese Dragon as he lunged at Akaza.
"He's so cool!" Evil shouted before there was a concussive boom! caused by Akaza charging forward and colliding with Rengoku.
Once the kicked up dust cleared, everyone saw that Akaza had punctured Rengoku through the abdomen, his arm going straight through the Flame Hashira. "Fuck," Rengoku muttered, his sword lodged into Akaza's other arm instead of Akaza's neck.
"You should become a Demon so you could live," Akaza told Rengoku with a smile on his face.
"Eat a dick," Rengoku muttered, before Akaza removed his arm from Rengoku's torso and kicked him right next to Leviathan.
The Upper Rank 3 didn't seem amused or pleased with Rengoku's decision. "But now you will die," he said, removing the Flame Hashira's sword from his arm. "Pity. You were strong."
"You bastard!" Tengen shouted, before Gyutaro appeared next to him while he was distracted and cut off one of his hands.
"JK, not busy," Gyutaro told the Sound Hashira, before also slashing at Tengen's face. Tengen barely dodged, but lost his eye in the process as it was slashed. "Enjoy the poison, pretty boy!"
Ainz looked at the situation and saw it was very much unfavorable. "Evil, just say the word," Ainz called out, still clashing with Zohakuten.
"Tell me, can a skeleton go deaf?" Zohakuten questioned.
"The hell does that mean?" Ainz asked, before Zohakuten took a deep breath and let out a deafening scream at the top of his lungs, causing Ainz to get disoriented as a result.
Leviathan let out a whistle. "Seems my time here might be ended early," Leviathan commented.
"I'LL PUT YOU IN A POT!" Gyokko shouted once more. "YOU'LL BECOME FISH!"
"I'm sorry, what?" Leviathan asked as Gyokko got close to Leviathan. The primordial being decided to take a step back and dodged Gyokko's attempt to touch him, before the platform underneath him turned into several fishes that fell downwards within the Infinity Castle. "...hmm."
"LET ME TOUCH YOU!" Gyokko shouted, before Leviathan kicked the pot Demon in the side of the head, sending him right back towards the other two Upper Ranks.
Doma looked at Gyokko. "Pothead~. Pothead~?" Doma looked at Kokushibo with a smile. "Seems he's out cold." The Upper Rank 1 remained silent, and instead stepped forward towards Leviathan, who hovered in mid air. "Huh?"
Leviathan stared at the Upper Rank 1, a bit intrigued by him coming forth and him remaining silent. "At least one of you is quiet," Leviathan commented while Kokushibo drew his sword.
"Show me your strength," Kokushibo declared, eyeing up Leviathan with all 6 of his eyes.
Before Leviathan could even begin to reply, Evil suddenly showed up, lunging at Kokushibo while holding Rengoku's blade, which Akaza had discarded. Kokushibo quickly turned on his heel and clashed his blade with Evil's.
"Eyes on me," Evil stated as he glared at Kokushibo, all the while smiling.
"You have a different opponent," Kokushibo reminded, before Daki's sashes came in from behind the Upper Rank and pounced on Evil. Evil was pushed back from Kokushibo as a result, forced to start slashing at the sashes again. Evil realized however that he could cut the sashes more effectively with Rengoku's katana.
"Rengoku," Evil called out as he thrusted his hand forward, causing a shockwave to blast Daki's sashes back. "How do I do that thing you did?"
Rengoku looked at Evil. "What?" He said weakly, losing a lot of blood.
"That Flame Breathing," Evil asked. "How do I do it?"
"It requires training," Rengoku stated. "And you need to visualize the flames."
Evil looked at Rengoku for a minute, before nodding. "I understand," the Demon God replied. "Ainz!"
Ainz dodged a wooden dragon conjured by Zohakuten. "Yes?"
"Oh so you can still hear," Zohakuten commented.
"Heal Rengoku and Tengen," Evil said as he struck a pose with the sword. "I shall take care of things."
Leviathan looked at Evil, baffled. "You intend to kill them?" Leviathan asked Evil. "Weren't you trying to recruit these vampires?"
"Demons," Doma corrected.
"Shut it," Leviathan snapped.
"Oh no, I intend to knock them out and go straight for Muzan," Evil said. "Now…" Evil focused on the Upper Moons. "Let's dance."
"Better idea," Leviathan began. "Go kick Muzan's ass."
"...really?" Evil asked, looking at Leviathan. "But then who will fight these Demons while Ainz saves Rengoku and Tengen's lives?"
"You should be worried about yourself!" Gyutaro shouted. "You're poisoned after all!" Evil then looked down at his arm, reminded that he was poisoned.
"Oh yeah," Evil said in realization. Leviathan face palmed, before Evil ripped his own arm off and regrew it. "Problem solved!"
"What?" Gyutaro questioned. "You… You can't just do that!"
"Cheater!" Daki shouted at Evil, pointing at him accusingly.
"Just go goddamnit," Leviathan stated. "I'll put up a shield."
"'Kay!" Evil said, before charging past the Demons and starting to blitz through the Infinity Castle towards Muzan.
"No you don't!" Daki shouted, before charging after Evil. The rest of the Upper Ranks followed suit, except for Gyokko who was unconscious, and Hantengu who was a weeping wreck.
Leviathan smirked, before crossing his arms. Tengen was confused as he looked at Leviathan. "Where's the shield?"
"Don't need one," Leviathan said. "And besides… did you really think I'd put up a shield?"
As Muzan made a tactical retreat, he was annoyed and pissed off at the fact humans managed to find this safe haven. It was impossible, ludicrous even!
"How did those damn insects find this place?!" Muzan practically hissed out loud as his anger grew.
"MUZAAAAAAAAAAAAAN!" Evil shouted, causing Muzan to turn around as Evil flew at him, Rengoku's sword above his head. The Demon King's eyes widened in shock and fear as he narrowly dodged the attack. "I found you!"
"HOW?!" Muzan questioned. "My Upper Moons were supposed to kill you!" As if on cue, the remaining wake Upper Moons showed up and surrounded Evil.
"We're here Master," Kokushibo said to Muzan. "He is a slippery one."
"Did you at least kill the Hashira?!" Muzan snapped at his Upper Moons.
"One of them has a hole in their chest," Akaza answered.
"And I poisoned the other," Gyutaro said.
"And what of the skeleton and black man?!" Muzan snapped. The Upper Moons were silent, before Muzan's annoyance grew. "You idiots! You left them alive?! What were you fo-" Muzan was cut off by a blade of energy suddenly piercing his mouth.
Evil smirked, the blade having extended from his hand. "You talk too much," Evil taunted, angering Muzan as he gagged on the energy blade.
"Moon Breathing First Form: Dark Moon, Evening Palace!" Kokushibo shouted as he performed a horizontal slash towards Evil, several crescent blades being hurled towards Evil.
"Lotus Vines!" Doma shouted, waving both of his warfans at Evil and creating ice lotuses and frost vines to pierce Evil.
Evil, still with Muzan at the end of his energy blade, crossed his arm over his chest, before slashing around him and disrupting their attacks, slicing each of the present Demons up. As he finished, he tossed Muzan into one of the buildings as the energy blade dispersed.
As the Demons regenerated and realized the unpredictable nature of Evil, they slowly started to take this more seriously. Akaza, being among the quickest to regenerate, got to a crouching position and shouted, "Annihilation Type!" Akaza blitzed towards Evil, with the Demon God throwing a punch towards Akaza as he got within range. As the two attacks collided, Evil was notably sent back via the shockwaves caused by Akaza's technique.
As Evil regained his bearings, he quickly turned around as Zohakuten launched his wood dragons at him. While he was blasted by lightning, Evil spun and conjured a small Ki shield that obscured himself from view of Zohakuten's dragons. The lightning struck the shield and a Ki Blast shot out and destroyed one of the wood dragons.
"Moon Breathing Third Form: Loathsome Moon, Chains!" Kokushibo shouted, performing two large slashes that sent more of the crescent moon blades hurling towards Evil. Evil used Rengoku's blade to block or deflect most of the slashes. Even though several got through, the wounds didn't stay for long as he regenerated.
"That regeneration is going to be a problem," Gyutaro commented.
As Muzan got out of the debris, he glared over at Evil and said, "He can regenerate?!"
"Yes!" The Upper Moons all answered.
"Kick his ass!" Muzan's voice called out.
"I call-" suddenly Akaza went silent as his arms went limp. The other demons noticed this and were confused, including Muzan.
"Attack your fellow Demons!" Evil ordered Akaza suddenly, and to their surprise, Akaza lunged at Zohakuten, the first one in his sight.
"What?!" Zohakuten questioned as he was attacked by Akaza.
"You fools, that bastard is using my voice!" Muzan called out. "Do not let him control you!" The Demons saw Muzan was talking and understood Evil's attempts at deception. "If needed, kill Akaza!" Before Muzan could continue to shout orders, Evil lunged once more with Rengoku's Nichirin blade.
"Flame Breathing!" Evil declared as the katana his hand actually caught fire. "Fifth Form: Flame Tiger!" Evil performed a downwards slash intending to split Muzan in half. The Demon progenitor jumped back, but was startled by a flaming silhouette of a tiger coming from the sword and pouncing on him, exploding on impact.
'He's copying the Breathing Techniques?' Kokushibo thought as he looked at Evil, surprised by the use of the technique. 'How is he doing that?!'
"You BASTARD!" Muzan shouted at the top of his lungs, his rage skyrocketing as his charred body regenerated, before Evil drove the sword straight through Muzan's chest and through his heart.
"I gave you a chance," Evil replied as the flames burned Muzan on the inside, causing smoke to come from Muzan's mouth as he violently coughed. "You should have accepted." Pulling the sword out of Muzan's chest, creating a large gash on the side of his torso, Evil spun on his heel and made contact with Muzan's neck, the sword cutting through his flash before completely decapitating him in a fiery blaze.
Over at the otherside of the area, Zohakuten had landed a fierce blow upon Akaza, who suddenly broke out of his daze. "What the-?" Akaza questioned before getting shocked by Zohakuten.
"Eat shit traitor!" Zohakuten shouted.
"I'm not a traitor!" Akaza retorted, before the two turned and saw Muzan had been decapitated.
Evil smirked proud of himself, before turning to look at the Upper Moons, who were enraged and baffled by Evil, the only person they've ever seen actually decapitate Muzan Kibutsuji. "So," Evil began as he looked at the Demons. "What say the rest of you?"
"You think you won?!" Daki shouted, her voice filled with anger.
"Well yeah, decapitating you fools with one of these blades is what kills you, no?" Evil replied before he was suddenly punctured from behind and nearly ripped apart as he was thrown into the air. As he turned around, he saw Muzan was very much still alive, but now had long white hair, several whips extending out from his back, and mouths along his arms and legs, and even the whips.
"I'll kill you, I'LL KILL YOU, I'LL FUCKING KILL YOU!" Muzan screamed at the top of his lungs, a sound heard across the entirety of the Infinity Castle. Evil was clearly aware that something had to be done, especially as he was forced to deal with the might of the Demon King and the Upper Moons.
The overwhelming amount of attacks thrown at Evil would be enough to kill a man numerous amount of times, especially as Kokushibo's crescent moon blades, Doma's ice constructs, Akaza's shockwaves, Zohakuten's lighting and soundwaves, Daki's sashes, Gyutaro's blood sickles, and Muzan's whips all attacked him at once. Evil was speeding up with each attack he dodged, deflected, or redirected, even going so far as to use the Demon's as shields.
'I don't know anymore Flame Breathing techniques!' Evil thought to himself as he held onto Rengoku's sword, keeping it in his hand as he clashed with Kokushibo's blade, rotating between blocking his attacks to dodging the Upper Moons' combined ranged attacks. 'What do I do?! Think Evil, what would Lego do in this scenario?!'
Evil took a brief moment to think back to a time well remembered in his mind, as he did so, time seemed to slow down. The image of the Hero he fought for years present as he remembered each battle they fought in vivid detail. Evil opened his eyes slowly as he remembered something important.
'Oh right, Super Saiyan,' Evil thought, before rising into the air and glowing orange, before transforming into a Super Saiyan. The Demons were all blinded by the light of the form.
"Is he becoming the Sun?!" Muzan shouted in fear. Evil returned to the platform, tossing Rengoku's blade high into the air.
Evil blitzed Akaza as he grabbed him by the face and slammed him straight into Daki, sending them back before tossing a Ki Blast towards them. Creating a scythe out of Ki, he spun on his heel to face Kokushibo as he slashed at the Upper Rank 1, his attack knocking him off balance. As Kokushibo attempted to recover, Evil slammed his fist into his stomach and shouted at the top of his lungs, piercing him with a Ki Blast that sent him back, with Kokushibo falling off of the platform from the shock of the attack.
Doma's ice started to take on a humanoid form as Doma waved his fan. "Cold White Princesses!" Doma shouted. Despite the area suddenly getting frozen, Evil screamed, powering up before dark red flames conjured out of his arms. It was obvious to Doma that this wasn't going to end well when he was blasted with these flames, melting his ice and stunning him significantly.
"Damn it!" Gyutaro screamed as he lunged towards Evil. Zohakuten also conjured more wood dragons, which all began firing lightning towards Evil.
Evil's hand tensed up before performing a sweeping motion in a downward arc. Gyutaro then felt a piercing pain through his upper back and neck as Rengoku's blade, which was high in the air, came down rapidly and sent him through the floating Japanese style flooring, straight down towards the bottom of the Infinity Castle alongside Kokushibo. Evil raised his other hand as magical seals formed around him as he shouted, "Call Greater Thunder!" The lightning Evil conjured clashed with Zohakuten's dragons, creating a smoke cloud.
Zohakuten was startled when Evil came hurling through the smoke, spinning at a speed that blurred all details of his body, before getting socked in the face. Before he could hit one of the buildings in the Infinity Castle, Evil was already there waiting for the Upper Rank 4 as Evil slammed his knee straight into Zohakuten's back, breaking his spine. Evil brought his hands together and slammed them into Zohakuten's head, the impact destroying his head as he fell.
Muzan saw this, and instantly he felt fear at what he saw. Before he could even begin to run, Evil was up in his face, the glowing orange-golden aura directly in front of him as Evil's foot was driven into his ribcage, getting kicked through the traditionally Japanese styled buildings of the Infinity Castle. Evil did not let up in his assault as he threw punch after punch against Muzan and overwhelmed him with his Saiyan might.
"DAMN YOU!" Muzan shouted as his whips lashed out and slashed at Evil. Although the attacks landed, the cuts weren't as deep as Muzan would prefer. In fact, it only made Evil's smirk grow.
"What's wrong, Demon King?! Aren't you meant to be stronger than this?!" Evil shouted as he grabbed one of Muzan's tendrils, before tugging on it and forcing Muzan closer, slamming his fist into Muzan's head and piercing through it. Evil fell backwards as he planted his foot into Muzan's stomach, kicking the first Demon towards the ceiling.
After a moment, Muzan fell back down, before slowly standing as his head regenerated, pure hatred burned onto his face."How… HOW?!"
Evil chuckled. "I'm just built different." Evil then readied his sword. "So Muzan, it's time for you to go all out."
"I AM GOING ALL OUT!" Muzan spat, a couple of blood vessels popping from the anger he felt. Evil on the other hand was caught off guard.
"You are?" Evil questioned. "Wait, are you unable to use the same powers as your Demons?"
"I-" Muzan was baffled by Evil's questioning, but he glared at Evil. "N-No!"
Evil seemed disappointed to learn this. "...hmm." Muzan then tried lunging at Evil, slashing at him with the tendrils he had all over his body. Evil in his disappointed state lifted two of his fingers and summoned a barrier around his body, blocking Muzan's attacks.
"DAMN IT, DAMN IT, DAMN IT!" Muzan shouted, his assault of attacks doing nothing to Evil. Evil then slashed at Muzan abruptly, cutting his head off again. Muzan's head reattached to his body, but Evil repeated the process with Rengoku's sword.
Evil scoffed as he slammed his fists against Muzan's head and knocked him into a building within the Infinity Castle. "I'm bored," Evil told Muzan. "...you're boring me. The only ability you have is these whips and that's it. That's pathetic."
"Pathetic?!" Muzan snapped as he sat up, glaring at Evil. If looks could kill, perhaps Muzan could've killed Evil. But the ruler of the world was dismissive of Muzan.
"All For One, a human, is more interesting than you," Evil said. "And he's more fragile." With an annoyed scoffed, Evil commented, "I bet Young Xehanort could make short work of you, and he's human too! Maybe not as strong as All For One, but I definitely think he'd find a way to defeat you."
"The only way for me to die is to be exposed to sunlight!" Muzan stated. "No weapon could ever kill me!"
"That's very debatable," Evil commented as he looked at Muzan. "I know of several that are capable of that and- huh… Leviathan is right, you do sound like vampires." Muzan then shouted at Evil, lunging at him in a desperate attempt to do something to the superior fighter. Evil wasn't impressed as he caught Muzan's fists. "Oh wow, so impressive." Evil glared at Muzan. "How about I wrap this up?"
Muzan growled, before suddenly stabbing Evil with one of his tendrils. "Let's see how funny it is when you're under my beck and call!" Muzan shouted, injecting Evil with some of his blood.
Evil felt the blood entering his system, though the effects weren't immediate. "Better idea, let's see how quickly you burn up in front of the sun."
"What?!" Muzan questioned.
Evil gave a sinister grin, before headbutting Muzan, and then putting him into a full nelson. "OPEN WIDE!" Evil shouted as the two teleported. Muzan instantly went blind and felt his body rapidly start burning and disintegrating as he gazed directly at the burning hot Sun. Evil laughed as Muzan faded entirely, before backing up a bit. "Easy," Evil said.
The Demon God turned around and began to fly slightly towards the Earth… but oddly, he felt watched. He looked around, and even at the Sun. "Odd… why do I feel watched?" Evil questioned.
Evil shrugged, before teleporting back to the Earth in the Infinity Castle where he was prior to teleporting Muzan into the Sun. As he reappeared, he saw the Upper Moons were looking around for him and Muzan.
"Where's Master?!" Daki shouted as she glared at Evil, panic and anger etched on her face, as well as her voice. The Upper Moons had regenerated from their wounds inflicted prior, and all seemed ready to face Evil.
Evil smirked and laughed. "I gave him an audience with the Sun in the vacuum of Space."
The Demons all visibly winced and backed up. Considering the sudden disappearance of Muzan… it was safe to assume Evil was telling them the truth. The Upper Moons glanced at each other, unsure if they should even continue fighting Evil since they did so on orders of Muzan.
"Now then," Evil began, an arrogant and cocky smile on his face as he pointed his thumb at himself, "I shall give you all a choice. The choice is quite simple, especially if… if…" Evil's eyes widened as his body trembled, shaking as he felt his cells start responding to Muzan's blood in his system. Evil started shouting in pain as he brought his hands to his head and took several steps backwards, stumbling from the unexpected feral instincts that came with being turned into one of Muzan's Demons.
"Master turned him?!" Doma questioned, the Demons all recognizing the process. They have all gone through it once after all.
"Apparently," Zohakuten replied, before Evil's golden aura shone once again as he screamed at the top of his lungs.
Meanwhile, back with members of the impromptu Demon Slayer group, everyone turned towards the sound of Evil's screaming. Tengen, having lost his eye and hand yet otherwise fully healed, was bothered by Evil's screaming. "Damn it, they're torturing him," Tengen commented.
"We need to get over there, now," Rengoku said, forcing himself to stand despite how sore his stomach felt after Ainz healed him.
"Not yet," Ainz said as he held Tengen's severed hand. "At least wait for me to reattach Tengen's hand."
Leviathan merely looked in the direction of Evil, his eyes narrowing a bit. Seeing this, Rengoku looked up at Leviathan and asked, "Are you worried?"
"More curious to see how this goes," Leviathan replied with his arms crossed, before Evil's screaming grew louder. "Ugh, why is he so loud?"
"It feels like he's screaming in my ear," Tengen replied, covering his right ear. "Seriously, someone tell me what that hell is going-"
Tengen's unfinished question was answered by a shockwave that suddenly shot out and tore most of the buildings and platforms to shreds. Ainz had to put up another barrier as the wood splintered and became projectiles. "Bad news," Ainz began. "I'm out of MP. If this shield goes down… pray Leviathan actually conjures one."
"I think we should be concerned," Rengoku remarked, pointing off into the distance where a red glow was.
Hovering amidst the destroyed portion of the Infinity Castle was Evil, surrounded by a crimson red aura. His hair was raised in a similar fashion to his Super Saiyan state, but now his hair was a blood red in color. His sclera was black with piercing red pupils, all the while growling like a feral dog.
"What is that form?!" Tengen questioned, surprised.
"I… I do not know…" Ainz replied as they observed the hovering Evil, the silent menace and threat looming over their heads.
Little did they know…
"GRAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHH!" Muzan shouted from the top of his lungs as he was relentlessly pummeled within Evil's mind, powerless inside of Evil's body. "How… HOW ARE YOU FIGHTING ME?!"
Evil, in his awoken state, laughed at Muzan as he assaulted him, violently launching attacks on the Demon King. "You think you can best me?!" Evil questioned with a shit eating grin on his face.
"I… I should be controlling you! B-Becoming you!" Muzan could feel his control slipping easily as he was beaten within Evil's mind. "What… What are you?!"
Evil laughed at Muzan more, kneeing him in the face, and stomping on his ribs violently. "What am I? WHAT AM I?! I AM THE CULMINATION OF THE MULTIVERSE'S FIGHTERS IN ONE PERSON! I AM THE CREATION OF A GOD! I AM A DEMON WHO WILL NOT ONLY KILL SAID GOD, BUT SHOW THE UNIVERSE WHAT IT MEANS TO BE A VILLAIN!" Evil kneeled, looking Muzan in the face. "And you just added your abilities to be biomass."
"I command you!" Muzan hissed. "I CONTROL YOU! I AM-" The Demon Progenitor was cut off by Evil thrusting his fist into Muzan's chest, ripping out one of his hearts.
"-nothing," Evil whispered, finishing Muzan's statement while holding the heart in front of his face. Muzan reflected on his years of existence, but found nothing to reflect on. He was not sorry…
"Life's like a trigger when you pull it," Evil told Muzan with a sadistic grin on his face, having a tune to his words.
And his legacy would be forgotten.
"Like a bullet."
Krrrt!
In the real world, everyone watched Evil with anticipation, expecting some sort of fight. But it never came, as Evil smiled and powered down, floating towards the ground.
"I feel the power, coursing through me," Evil began as he looked at his hand.
Kokushibo looked at Evil, believing him to be Muzan. "Master?" The Upper Rank 1 questioned, but Evil shook his head.
"Muzan is dead," Evil said simply as he landed. "Now… All hail Evil." As the Upper Moons were forced to come to terms with this reality, Evil added, "You now follow my orders. So… welcome to my army."
The Upper Moons exchanged uneasy glances (minus Doma though), but all kneeled around Evil. "All hail the new Master."
Evil blinked. "...I hate that," Evil stated, referring to being called 'Master'. "Just Evil is fine." Evil walked past the Upper Moons, before flying towards the Demon Slayers and saying, "Mission Successful. We are RTB." The Demon God gave Rengoku back his sword, and continued to walk off, leaving everyone dumbfounded.
Leviathan stared intently at Evil, a bit curious. "...how odd," Leviathan said to himself, acknowledging Evil's sudden and subtle evolution, as well as his rapid adaption.
…yeah, this is a long chapter, but I wanted it to be one and done. No need to drag things out.
Crossover Credits:
Leviathan (Euphory.a_, Instagram)