Here comes the next chapter of Demon Slayer AU:
(Infinity Castle)
Shortly after Doma's defeat, Seth had to sent Shinobu far away from the battle, after everything she done for them, taking care of the Demon Slayer who were injured in battles, this time the prince returned the favor to her, surely Giyu would understand him the idea of kept Shinobu away from the danger.
"The Upper Moon Two was defeated! But Shinobu Kocho retired from the battle!" The kasugai crow said.
For Tanjiro and Caleb it was a huge relief in not losing allies as they kept advancing.
'I'm glad to know that we made it in time, even if one of our allies retired, she is still alive, we must keep advancing!' Tanjiro said in his thoughts as he wondered about Shinobu living happily with Aoi and the triplet girls, even Kanae was included there.
'This is 100 times better, more heroes which means chances of saving the known people of the Taisho Period.' Caleb said in his thoughts with determination, willing to protect everyone.
They tried to advance but only to be blocked by the Spider Family but as Dark Clone Demons, Spi-Brother, Spi-Sister, Spi-Mother and Spi-Father.
"This should be easy, after a long training, nothing's gonna stop us now!" Caleb said.
"Gatch Claw!"
"Big Bang Punch!"
"Music Hour!"
"Vanquish Claw!"
"Breakclaw!"
"Double Lariat!"
"Startling Thunder!"
The seven attacks were sent with the seven of them hitting the Spider Family.
"What happened?" Tanjiro asked.
"Look!" Veemon (DB) pointed at the group of seven children and then Caleb scanned them with his phone.
"Haru Shinkai with Gatchmon, Eri Kanan with Dokamon, Asuka Torajirou with Musimon, Rei Katsura with Hackmon or Hackermon, Hiro Amanokawa with Gammamon, Ruli Tsukiyono with Angoramon and Kiyoshiro Higashimitarai with Jellymon." Caleb said before tossing elixirs to them. "Here, this will allow your Digimon to kill demons!"
They nodded before giving the elixirs to their Digimon partners.
"Now hurry up, we will battle against them!" Haru told them.
"We got this!" Hiro A added.
Tanjiro, Caleb with his Digimon and Pokémon nodded before advancing as the new group fight against the Dark Clone Demons and then they managed to find Mikey with Shoutmon, Pit, Gon, Lan Cross Fused with Mega Man, Geo merged with Omega-Xis, Chris T with Teal Veemon, Tidus, Naruto, Meliodas and Zoro.
"You made it." Chris T said.
"Yeah, Nakime's Blood Demon Art is canceled, she won't separate us anymore." Caleb said.
"That is great news." Meliodas said.
"However, we must stay alert." SF Mega Man said.
Just then sharpened spider threads appeared and they barely dodged as they saw the Fifth Lower Moon of Mount Natagumo, Rui, but as a dark clone demon, again.
"You again!?" Gon said.
"I remember you clearly that I was going to kill you without regret, if it weren't for that nosy friend of yours." Dark Rui said to Tanjiro, referring to Tomioka and continued explaining. "All that was left for me was pure fury, and since I cannot have Nezuko as my sister, then no one else will have her and I will kill her."
Tanjiro's brow furrows in anger, his eyes narrowing at Rui's words.
"You won't lay a finger on anyone, especially Nezuko." He stated, his voice firm. "I won't let you hurt her or anyone else again!"
He and the others joined the battle.
"You can do the attacks you want but you won't have a chance against me." Dark Rui said.
*Armogohma Battle - First Half (LOZ: Twilight Princess)*
-Lower Moon Five, Dark Rui-
Dark Rui attacked by swinging his sharpened threads and firing shots of threads but they managed to dodge the enemy attacks, then Caleb used Rising Sun and Steel Raid, Veemon (DB) and shiny Mew used Dragon Claw, Shoutmon used Fire Lash and Fiery Fastball, Pit fired arrows, Gon used Jajanken Scissors, Lan and Geo used Energy Sword, Chris T fired light explosive shots from his arm cannon with Teal Veemon using V-Arrow, Tidus used Energy Rain, Naruto using Rasengan, Meliodas used Hellish Blaze and Brutal Kick, Zoro performed Castle Gate-Two Gorilla Cut and Tanjiro performed his known techniques of the Sun Breathing which managed to damage Dark Rui greatly.
Meanwhile back with Haru and Hiro's groups.
"Appmon, chip ready!" Haru, Eri, Asuka T and Rei K. said as they readied their devices.
Gatchi-Navi, three-two-one, Appli-Fusion to… DoGatchmon!
Gatchi-Navi, three-two-one, Appli-Fusion to… Mediamon!
Gatchi-Navi, three-two-one, Appli-Fusion to… Dosukomon!
Gatchi-Navi, three-two-one, Appli-Fusion to… Raidramon!
"Let's do this!" Hiro A. said as Ruli and Kiyoshiro nodded and readied their devices from their wrists.
Gammamon Digivolve to… BetelGammamon!
Angoramon Digivolve to… SymbareAngoramon!
Jellymon Digivolve to… TeslaJellymon!
The seven Digimon Digivolved while facing the dark clone demons.
"DoGatch Buster!" DoGatmon fires a powerful blast of energy.
"Howling Blast!" Mediamon fired a supersonic pulse from his speakers.
"Jet Palm Slap!" Dosukomon flew at high speed to hit the dark clone demons.
"Barrage Jack!" Raidramon sunk the claws into the ground sending spikes from the ground.
"Sol Shot!" BetelGammamon fired flames from his hands.
"Breaking Stream!" SymbareAngoramon unleashed a powerful tornado from his hands.
"Punishock!" TeslaJellymon fired voltage.
The seven attacks went to the Spider Family dark clone demons and destroyed them completely.
"They are finished." Ruli said.
"Now let's keep going." Eri Kanan said and they continued.
Back against Dark Rui, Tanjiro performed Phoenix Flash, Cross Slash and then Scorching Sun which managed to behead Dark Rui with no sweat.
*Ends*
And then after beheading Dark Rui and before his body could move, Caleb ran to grab Rui's body and toss him into the void to avoid from preventing the dark clone to take everyone down with him.
"But how? My neck is very thick, a lower Demon Slayer like you shouldn't be able to cut my head, even my threads sliced your sword the last time." Dark Rui said as his head was lying in the ground.
Tanjiro looks at the defeated dark clone demon, a mix of anger and confusion still lingering in his expression.
"Perhaps my training and experience have made me stronger since our last encounter." Tanjiro responded. "And perhaps the will to protect those I care about has given me an edge. Regardless, you no longer pose a threat."
"Having your sister Nezuko was nothing personal, I was just trying to recover my memories from my human life." Dark Rui explained to them.
Tanjiro listens to Dark Rui's explanation, his expression softening slightly.
"I understand." He says, his tone filled with sympathy. "You were seeking to regain your lost memories, the same way Nezuko was trying to regain her humanity."
"Even though I wanted to remember my life when I was human, Muzan erased all my memories of my human life." Dark Rui explained.
Tanjiro's eyes widen in realization as Rui explains how Muzan had erased all his memories of his human life.
"That... That's horrifying." Tanjiro says, his voice filled with shock and sympathy. "To have your memories and your identity stripped away by Muzan, it's unimaginable."
"Also unforgivable." Caleb angrily added.
Tanjiro nods in agreement, his expression hardening once more.
"Absolutely unforgivable." He says, his tone filled with an edge of anger. "To take away someone's memories and identity, it's a violation of their very essence as a person. I can't fathom how evil Muzan must be to commit such an act."
"But the only thing I remember when I had my human family, is that I was so hungry that I couldn't contain myself and I devoured my siblings, my father suicided himself and my mother, the last words she told me before dying, she told me that I'm sorry for not giving you a strong body which means that in my human life I had a weak and frail human body and that was how Muzan turned me into a demon." Dark Rui explained with regret.
Tanjiro listens to Rui's revelation, his expression a mix of shock, sympathy, and understanding.
"That's a terrible burden to bear." Tanjiro says, his voice filled with compassion. "To have been forced into the life of a demon, and to have been the cause of your own family's tragedy, it's unimaginable pain and guilt to carry."
"Even as a Lower Moon Demon, I gathered many demons, making my own family in hopes to recover my human memories but it didn't work as I expected and that was why I wanted to have Nezuko as my sister even if it means by force." Dark Rui continued explaining as Tanjiro understood Rui why he wanted to take Nezuko away from him.
Tanjiro nods solemnly, acknowledging the pain and desperation that led Rui to seek a new family through the demons he gathered and his desire to have Nezuko as his sister even by force.
"I understand now, Rui. It must have been a difficult and lonely journey, filled with pain and regret. I can't say I agree with your actions, but I can see the sadness and longing that drove you to act as you did." He said.
"You had a harsh life in the past, but even if you're a dark clone, I'm sure your human half is in heaven with hopes to be reborn and without being turned into a demon once Muzan is finished." Caleb explained to Dark Rui which head is close to disappearing completely.
"Thank you." Dark Rui said as he streamed a tear from his right eye.
Tanjiro looks at Dark Rui, his expression softening with a mix of understanding and sympathy.
"I hope that your human half finds peace and rebirth, without the burden of being a demon." Tanjiro says gently.
As he watches Dark Rui's single tear and hears his thanks, he feels a mix of sadness and hope. Sadness for the suffering Rui has endured and hope for his human half finding peace.
"Rest." Caleb told where Dark Rui's head disappeared.
"Later we'll reach you guys." Lan told them and Tanjiro and Caleb with their partners nodded before advancing.
The two main ones, with partners included, were advancing until they saw Bakugo, Shadow, Zen-Aku, Squall, Knuckle Joe, Sirica, Demitri, Terry Bogard, Gladion's Lycanroc, Impmon facing a dark clone demon who looked like a policemen and at the same Virgo, Sailor Moon, Sailor Mercury, Sailor Mars, Sailor Jupiter, Sailor Venus, Zelda and Lana are facing a female demon who has crimson flower in her hair, then Caleb scanned the two dark clone demons.
"Hairo and Ubume, both as dark clone demons." Caleb said before he along with Tanjiro approached the others.
"I don't know what you are trying to do, but no one will prevent me from getting revenge against Kyojuro Rengoku!" Dark Hairo said.
"How sad because Kyojuro Rengoku was revived!" Caleb said.
"Yeah, and we won't let you or Muzan kill him again!" Tanjiro said, willing to protect everyone.
"How brave of you, maybe you two should rest with me." Dark Ubume said.
"Not a chance!" Virgo said in retaliation.
"Very well, then we will kill you all!" Dark Hairo said.
*Lizalfos Battle (LOZ: Skyward Sword)*
-Former Lower Moon Demons, Dark Hairo and Dark Ubume-
"Tanjiro, you fight against Hairo while I'll fight against Ubume!" Caleb instructed and Tanjiro nodded.
Dark Hairo used his Blood Demon Art: Shadow Wolves which summoned wolves of darkness but shiny Mew used Aura Sphere against them while Dark Ubume tried to create illusions but she was hit by Sailor Moon who used Moon Tiara Action, and now against Dark Hairo, he fired bullets from his body but the group who is against him dodged the attack, then Shadow used Doom Spears which is an improved version of Chaos Spears which hit Dark Hairo and followed by using Doom Blast which swung the legs to launch black energy x-shaped kicks, Tanjiro performed Solar Heat Blaze, Bakugo used his explosions at short-range hitting Dark Hairo, Zen-Aku used Crescent Wave, Squall performed Rough Divide, Knuckle Joe used Instant Mega Force Blast, Sirica fired a rocket, Demitri used Chaos Fire, Terry Bogard, Gladion's Lycanroc used Stone Edge and Impmon used Fire and Ice Punch with all them hitting Dark Hairo.
Now against Dark Ubume, she was having a hard time to attack, apart from Caleb along with DB Veemon and shiny Mew using their known skills, Virgo sent blasts of magic energy by thrusting her fists and swinging her legs, Sailor Moon became Super Sailor Moon before attacking with Moon Gorgeous Meditation, Sailor Mercury used Mercury Aqua Rhapsody, Sailor Mars used Mars Flame Sniper, Sailor Jupiter used Jupiter Oak Revolution, Sailor Venus used Venus Love Shock and Beauty, Zelda slashed in a zigzag pattern before launching light arrows at the sky and Lana stomped Dark Ubume with her magic block before exploding it and hitting the dark clone.
"I did everything to take care of you and this is the thanks that I get…!" Dark Ubume growled as she got up.
"Not before a delusional monster like you…!" Virgo said in retaliation.
Just before the demon could attack, a flaming arrow was sent and hit Dark Ubume.
"Stop!" A female voice.
Just then they turned to see a group of three girls, one is a very short girl with light red-braided hair and fiery red eyes and wearing a very short red, white and gold armor-like dress with a red cape and matching tiara-like headpiece, another is a tall girl really beautiful with flowing blue hair that has square bangs hanging over her forehead and blue eyes and wearing a black leotard with blue armor at the top with a blue cape, and the third one is a girl with chin-length sandy blonde hair that has short bangs hanging on either side, green eyes, rounded glasses and wearing a green armor dress with the skirt arranged in a pattern like feathers, a gold belt with an emerald on it, the shoulder armor pieces are white and arranged like her skirt, they are Luce, Marine and Anne respectively.
"Wow, the Magic Knights are here!" Virgo said with amazement.
"How do you know about us?" Marine asked the virgo warrior.
"Fan of the magical girls." Virgo replied quickly.
"Now drink this to defeat the demon!" Caleb said as he tossed three elixirs for the Magical Knights.
"Thank you." Anne said before drinking the elixir along with the other two magic knight girls.
Then they turned to see Dark Ubume, Luce used Ruby Lightning to fire ruby colored energy balls, Marine used Water Dragon which launched a large eastern dragon made of water and Anne used Emerald Typhoon which sent a strong gust of wind with the three attacks hitting Dark Ubume.
"Now I'll finish this! Eleven-point Constellation Rush!" Virgo said before concentrating magic in her fists and then with her fingers and touched so strongly marking eleven points and forming virgo's constellation on Dark Ubume's body before jumping back and after snapping her right fingers, a star explosion came on Dark Ubume's body and disintegrating her.
"Wow, that was impressive." Luce told the virgo warrior.
"Thank you." Virgo kindly said.
Now back against Dark Hairo, Tanjiro performed Water Breathing Tenth Form: Constant Flux which managed to behead Dark Hairo easily and finished the battle.
*Ends*
Dark Hairo's head landed in the ground.
"But how!? How could you use two breathing styles!?" Dark Hairo exclaimed in disbelief.
"The Water Breathing I learned with Urokodaki and the Sun Breathing comes from my family across generations!" Tanjiro firmly explained.
"Your Sun Breathing is the only thing so close to the Flame Breathing, that is why my master wants to disappear anything related with the Sun Breathing, all of you will…!" Dark Hairo's head said but disappeared before he could finish.
"This is far from over." Bakugo said.
"You must hurry while we will stay fighting against the demons." Zen-Aku said.
"We will be alright." Virgo added.
Tanjiro along with Caleb and his two partners nodded.
"Thank you." Tanjiro said. "We'll make our way as quickly as we can and count on you all to hold the line, stay safe."
The four continued across the fortress as they found Toon Link, Henry with Terriermon, Mega Man, Mega Man X, Dino, Vyse, Yugo, Lloyd, Bandana Dee, Keenan with Falcomon, all of them facing familiar demon who has drums, two in the legs and one in the abdomen.
"Wait, it's the same Drum Demon in the manor!" Tanjiro said.
"Yes, his name is Kyogai but now as a Dark Clone demon." Caleb added.
"More damn insects! All of you are a plague interfering in my search of rarebloods!" Dark Kyogai growled.
*The Tumbling (KH: Birth By Sleep)*
-The Drum Demon, Kyogai-
Dark Kyogai played the drum of his abdomen several times sending vertical slashing shockwaves but they dodged, but then he played the drums from his legs and this time it moved structures of the Infinity Fortress and the group had to avoid falling down or being crushed.
"That was new…!" Tanjiro said.
"What do you mean?" Dino asked.
"The Drum Demon never did that before…!" Tanjiro said.
Dark Kyogai played the drum from his abdomen to send diagonal slashing shockwaves, then Shiny Mew used Psycho Cut which hit Dark Kyogai, followed by Caleb casting Thundaga and DB Veemon using V-Headbutt, and Tanjiro performed Water Wheel, but then Dark Kyogai performed double clawing and an axe kick but they dodged, Toon Link slammed his Skull Hammer against the dark clone, Henry performed Blizzard Raid while Terriermon used Terrier Tornado, Mega Man used Metal Blade, Mega Man X fired his buster, Dino used Saban Straight Arrow, Vyse used Rain of Swords, Yugo in his werewolf form performed a clawing drill attack, Lloyd performed Rising Falcon, Bandana Dee used Spearcopter, Keenan tossed his boomerang and Falcomon used Ninja Blade, after Dark Kyogai received enough moves he unleashed a roar which slightly pushed everyone but suddenly some bombs were drop and hit Dark Kyogai.
"Need some help!" A male voice as they turned to see Tingle (from Majora's Mask) in a red balloon but holding a bomb which exploded, luckily Tingle was fine as he crashed.
"My turn!" Another male voice said and then a young man wearing purple clothes and a bunny-like mask appeared and was wielding a hammer before shooting three bombs from his bow and then summoned two tornados with the boomerang to combine together to blow Dark Kyogai away.
"Ravio and Tingle, you two made it in time!" Caleb said with a confident smirk before returning to the battle. "Just a bit more!"
"More damn insects!" Dark Kyogai roared before unleashing his moves however they dodged his moves and also Caleb passed elixirs for Tingle and Ravio.
And after doing enough damage to Dark Kyogai with their usual attacks (the attacks of Tingle and Ravio are from Hyrule Warriors), Caleb jumped while performing a hurricane diagonal slash.
"Kyogai! Your Blood Demon Art is incredible!" Caleb said.
Dark Kyogai was stunned in shock as he didn't move and then Caleb managed to slice his head.
*Ends*
Caleb landed fine as Dark Kyogai's head crashed to the floor.
"How did you do that?" Tanjiro asked Caleb.
"I learned it from you." Caleb said.
"Hey, did you like my Blood Demon Art?" Dark Kyogai said as his head was disappearing.
"Yes, however, I did what I had to do to finish you off." Caleb said.
"Anyway I had no purpose, neither in human life, nor as a demon." Dark Kyogai sadly said.
"What do you mean? Death does not mean the end for you." Caleb said.
"He is right, I didn't stomp your scripts, surely it will mean a lot for you, maybe for others who didn't like it." Tanjiro added.
"Kyogai, every ending is a beginning, and every beginning is an ending, but I'm sure you'll have a better life when you reincarnate." Caleb said.
"Thank you…" Dark Kyogai said before disappearing completely.
"Well, now let's move on." Caleb said.
"Later we'll reach you." Mega Man X said and the four nodded before continuing.
As Tanjiro, Caleb, shiny Mew and DB Veemon were advancing they found Leo along with the Sharp siblings, JP as Beetlemon, Jupiter Ledger, Sonic, Lucas, Cole McGrath, Smoke, Sara with Pulsemon, Gary with Ryudamon and Killua who managed to defeat some demons, even Leo managed to slice one in half vertically with his sword, but at the same time Zenitsu is there, standing seriously.
"Zenitsu? What are you doing here?" Caleb asked.
"Gramps told me that one of the Demon Slayers turned himself into a demon, gramps barely killed himself, however, my relationship with Nezuko stopped gramps from killing himself." Zenitsu replied seriously, referring to Jigoro, the former Thunder Hashira, however that "traitor" is unknown yet.
Tanjiro listens to Zenitsu's explanation, still surprised to see him standing firm and serious.
"I'm sorry to hear about that, Zenitsu." Tanjiro says, his voice filled with sympathy. "It's hard to barely lose someone close to you, especially in a way like that. I'm glad your relationship with Nezuko was able to save him from taking a drastic measure."
"Okay, Jigoro explained about Kaigaku, even he told me about him." Jupiter said.
"Last time, when he was human, he was bullying Zenitsu and Nezuko until I tossed an icy boulder at Kaigaku's face causing his nose to bleed and even Krisi kicked Kaigaku to teach him a lesson." Alban explained.
Tanjiro and Caleb listen intently to Jupiter and Alban's explanation about Kaigaku, the Demon Slayer who turned himself into a demon. Tanjiro's expression hardens as he learns about Kaigaku's bullying of Zenitsu and Nezuko previously.
"That's unforgivable." He says, his voice filled with anger. "He was supposed to be a fellow Demon Slayer, someone dedicated to protecting others, not bullying them."
"There are some chances that Kaigaku tried to defeat an Upper Moon Demon to prove that he is better than Zenitsu but he ended up losing before begging cowardly and that was how he was transformed into a demon." Jupiter theorized.
Tanjiro considers Jupiter's theory, his expression turning contemplative.
"That's a valid possibility." He says. "Kaigaku might have had a foolish pride that led him to recklessly challenge an Upper Moon Demon, expecting to prove his superiority over Zenitsu. But his arrogance could have been his downfall, and he ended up begging for mercy and becoming a demon himself."
Zenitsu stood quiet there until she heard some footsteps thanks to his high-developed hearing.
"I know you're here, come out already." Zenitsu called. "You're just dawdling over there."
"That's not the right way to address me, you may have improved a bit, but I'm the older disciple here." A familiar voice for Zenitsu said and then revealed himself as Kaigaku, still having his black hair and Demon Slayer uniform but now he is a demon and has cyan blue eyes like electricity flowing, and has the kanjis of the sixth upper moon in his eyes. "But you're still as dainty and seedy as ever and as for the little brat so small and annoying like the first time I met. Long time no see, Zenitsu and Alban."
"Kaigaku, now that you're a demon, you are no longer my senior." Zenitsu said seriously.
The team members stood in their fighting stances glaring at Kaigaku.
"You sure haven't changed." Kaigaku said.
"Look how low you fell, I really pity you." Caleb said as he crossed his arms.
However, Kaigaku sneers at Caleb, his eyes flaring with a dangerous gleam.
"Pity? Don't waste your breath on that. I didn't fall low, I rose above those pathetic humans." Kaigaku said, still seeing the group. "Weaklings like you will never understand the true power of a demon. I've surpassed your pathetic limits and embraced the power of an Upper Moon."
They glared with disgust at Kaigaku who turned his gaze on Zenitsu while Tanjiro's expression hardened as he looked at Kaigaku, his hand on the hilt of his sword.
"You're wrong, Kaigaku." He says firmly. "You've betrayed everything you once stood for. You're not rising above us, you're sinking lower than the filth you claim we are."
"And what if I betrayed them, all of you were such a waste of time." Kaigaku said before turning to see Zenitsu, still as a demon keeps bullying Zenitsu. "Puny, looks like chickenpox, weak as ever. You're a pillar now? Can you use anything else besides the first form? Come on, Zenitsu. And what about you, Alban, you're just a small, puny, meddling and naive small boy who interfered with my business by breaking my nose."
Tanjiro's grip on his sword tightens at Kaigaku's insults towards Zenitsu and Alban. He clenches his jaw, anger swelling within him.
"Surely you haven't changed one bit, have you, Kaigaku?" He says, his voice cold and hard. "You're still the same arrogant, sadistic bully you were before, only now you're an even bigger coward, hiding behind your newfound powers."
"You sure seem happy to play stopgap as the bottom rung, Upper Moon." Zenitsu dryly said.
"Turning yourself into a demon just for revenge is very obvious or cliché." Alban coldly mocked Kaigaku.
"Haha!" Kaigaku laughed arrogantly before speaking. "Hey, you can talk back now…"
"Why did you, the rightful successor of the Thunder Breathing, become a demon?" Zenitsu dryly asked Kaigaku before yelling. "If you hadn't turned into a demon! Gramps barely killed himself but after he met Nezuko, now he wants to live more seeing me with Nezuko to make a family someday!"
Tanjiro couldn't help but feel surprised from Zenitsu's sudden but serious rage, it was like the scary Zenitsu was gone forever.
"But that's not my problem. So? What of it? Am I supposed to be sad? Repent? I have no intent to reflect on what I barely did. I don't care." Kaigaku arrogantly said and clearly showed no regret for becoming himself a demon and kept explaining. "In fact I'm actually relieved that the old f*** isn't my teacher anymore, I worked so hard to please him, but he never gave me the successor title, he is a crappy old f*** who spouted crap about working together with dirt like you to share the successorship."
"So, Kaigaku, Aries told me more about you, you stole the money from Gyomei's temple and later you were expelled from there, but during one night you brought one demon in exchange of your own life but cowardly while the demon killed most of those children, Gyomei had to fight against that demon while protecting one little girl, however Gyomei was imprisoned by the fault of your cowardly actions." Leo dryly said, remembering information from the Multiverse Traveler.
"And instead of fighting and protecting the others, you only care for yourself and putting others in danger because of your cowardice." Caleb dryly said.
Kaigaku was surprised by the information about his past, but then he outbursts with fury.
"And what if the damn Stone Pillar was imprisoned 10 years ago, I did what I had to do, I could have died that night against than demon years ago, and even I could died this year against the First Upper Moon the last night before coming here, those temple children were too weak, I am the only one stronger to survive, without forgetting that those damn ice brats made their last mistake by interfering in my affairs and now I want to kill them in revenge!" Kaigaku angrily explained to Leo and also showed no regret for his acts of cowardice and treason, even his motive of revenge towards Alban and his two siblings.
Tanjiro and the others listen to Kaigaku's callous and selfish explanations, anger swelling within them as they hear his lack of regret and his motivation for revenge, Tanjiro clenches his fists tightly, feeling a mix of anger and disgust at Kaigaku's cowardice and betrayal.
"You coward! You don't get this!" Leo angrily said.
"You will feel my absolute zero breath." Alban coldly said.
"Just as Sub-Zero would say: This fight will be your last!" Winter added.
"You're really something else." Tanjiro says, his voice dripping with disdain. "You talk about being strong, but all I hear is weakness. You're nothing but a coward who only cares about himself and his own selfish desires. Now you betray your fellow Demon Slayers and put others in danger just to save yourself in the past. You're not strong, you're pathetic."
"Cowardice only will lead you to a dark abyss without exit and betraying your own kind was very low for you, therefore you don't deserve to live." Caleb dryly said to Kaigaku who sneered at Caleb, his eyes narrowing in irritation at the younger boy's words.
"Who do you think you are? You're just a kid who knows nothing about the real world. You think you can lecture me about betrayal and cowardice? You're naive." Kaigaku said before turning to see Tanjiro to give him a warning. "And as for you, this is between Zenitsu and me. So, don't interfere or I will kill you too."
Tanjiro bristles at Kaigaku's threat, his expression hardening with determination. He steps forward, standing protectively in front of Zenitsu.
"Don't threaten me." He says, his voice firm. "I won't just stand idly by while you try to hurt my companion. We'll stop you, whether you want us to or not."
"Do it if you want, Tanjiro." Zenitsu told him before shouting at Kaigaku. "Very well, if I'm dirt, then you're garbage but unless he has a proper successor even better than a scumbag like you! I can only use First Breath, and you can use all except the first breath!"
"Don't put me together with the likes of you!" Kaigaku shouted with fury.
"I fight against villains, but I won't tolerate a cowardly scum just like you!" Leo said firmly as he prepared his sword and shield.
"Now let's kill him properly!" Caleb said and they nodded.
"All of you will regret fighting against me!" Kaigaku said.
*Enter the Darkness (KH: Birth By Sleep)*
-Demon Slayers Corps' Traitor, Kaigaku-
Everyone got ready as Kaigaku prepared to attack.
"Thunder Breathing Fourth Form: Distant Thunder!" Kaigaku said before generating a ball of electricity which released waves of strong multi-directional lightning bolts from afar but they managed to dodge, Alban only ducked the attack while Jupiter received the attack and absorbed the electricity as if the enemy attack didn't damage him, and the same went to Killua.
Just when Zenitsu managed to didna slash to Kaigaku, Alban created an icy dagger which sliced through the stomach of Kaigaku causing his bowels to come out before Alban grabbed the bowels to freeze and break them causing Kaigaku to growl in pain and then Alban created a big icicle to thrust it and hit Kaigaku's right eye as he growled in pain and the Sixth Upper Moon Demon fell in his back, Tanjiro couldn't help but feel surprised of Alban's brutal fighting skills.
"You damned brat!" Kaigaku shouted with rage as he got up despite the freezing pain and at the same time he is having a hard time to regenerate himself due the cold.
"The ice is slowing down his regeneration, just like the other demons!" Krisi said.
"Good, that gives us an advantage, let's keep attacking him!" Tanjiro said.
Caleb performed Bullet Thrust with his Schiavona, DB Veemon used Dragon Pulse, shiny Mew used Ice Spinner, Leo performed Jump Strike, Alban thrusted his Ice Spear to hit Kaigaku, Krisi triple aerial kicked with ice in her sneakers, Winter created an Ice Hammer to bash Kaigaku's face several, Beetlemon used Thunder Punch, Jupiter L with his Saber Gun used Sixth Form: Rumble and Flash and Fifth Form: Heat Lightning, Sonic used Homing Attack before grabbing Kaigaku and performing Spinning Gear, Lucas (PK user) used PK Thunder, Cole MacGrath used Human Bullet on Kaigaku, Smoke tossed smoke against Kaigaku causing him to fall from above to aerial double punch him, Sara lashed her whip hitting the Upper Sixth Demon several times, Killua used Lightning Palms, Pulsemon used Thunder Punch, Ryudamon used Dragon Claw, Tanjiro performed Sun Halo Dragon Head Dance and Zenitsu performed Thunder Clap and Flash Eightfold, but Kaigaku growled with fury as he managed to regenerate himself.
"It is enough!" Kaigaku yelled.
Then he attacked by performing Thunder Breathing Second Form: Rice Spirit, followed by using Third Form: Thunder Swarm and Fifth Form: Heat Lightning and Sixth Form: Rumble and Flash, hitting the group while Gary was assisting Ryudamon to get up but also Kaigaku used his right hand to hold Alban by the neck but the Ice Elemental used his Zero Absolute Ice Breath which froze Kaigaku's right arm before breaking it with his icy dagger and Kaigaku screamed in pain and rage.
"What sorcery is this!?" Kaigaku shouted in disbelief and pain.
"Wrong! The ice is my element!" Alban said.
"Heal!" Sara casted Curaga which healed everyone.
"Let's attack him again!" Beetlemon said.
"Ryudamon!" Gary told him and Ryudamon nodded.
Ryudamon Digivolve to… Ginryumon!
Then Ginryumon used Iron Head which hit Kaigaku in the chest.
"Why do all of you help a wimp weakling like Zenitsu who is always crying for help and also afraid from the demons?" Kaigaku asked.
"It's better than a cowardly and traitorous scum like you!" Jupiter L said before performing the six known Thunder Breathing techniques which were performed by Kaigaku and were against him.
"Impossible, how can you use the Thunder Breathing against me? You aren't a Demon Slayer!" Kaigaku exclaimed in rage.
"I don't need to be a Demon Slayer, because I hunt villains like you and since I'm the Thunder Elemental, I easily learned the Thunder Breathing techniques!" Jupiter L replied as Kaigaku managed to regenerate his arm.
"I don't care to be the next Thunder Pillar, it's better to be a demon of the Upper Moons!" Kaigaku said.
They continued fighting against Kaigaku and dodging his attacks, the heroes used their known skills against him and in one of them, Alban created an icy clone as Kaigaku hit the icy clone and then the ice from the clone started to freeze Kaigaku.
"Zenitsu, now!" Alban called him.
"Thunder Breathing Seventh Form: Flaming Thunder!" Zenitsu said before dashing forward at blinding speed while a yellow Japanese dragon-shaped like a light bolt appeared and the user unleashed a singular forward slash at a low stance and beheaded Kaigaku successfully.
*Ends*
Everyone watched in amazement how Kaigaku was beheaded and his head fell down.
"He did it, he defeated an Upper Moon." Tanjiro whispered in amazement.
"I couldn't see that! What was that just now? That was too fast! I don't know that form. What did he use?" Kaigaku asked in disbelief. "Damn it! Damn it! So, the old man was playing favorites! He taught you something he never taught me!"
"This is my form, I learned it myself." Zenitsu replied seriously.
"I can't! I can't accept this! I cannot accept this situation! I lost? Not only to a guy and other meddling guys like that! My head is about to go mad!" An infuriated Kaigaku said. "Even my revenge against that icy brat was taken away!"
Tanjiro watches as Kaigaku struggles to accept his defeat, his anger and frustration boiling over.
"It's over, Kaigaku." Tanjiro says firmly. "You lost. Just accept it and move on."
"This happened because you always were a coward in your human life and now you are pathetic lower." Leo firmly told Kaigaku.
"You got yourself into the abyss with no way out, now that you are dying, don't even think about being reborn." Alban told him.
Kaigaku growled in fury as Alban stood over him, judging him with the coldness of a child.
"Who the hell do you think you are?! You're just a brat, a damn kid, talking down to me like you're better!" Kaigaku shouted, feeling a mix of anger and humiliation at being lectured by someone so young. "You think you know everything just because you and your friends beat me, huh? You're nothing but a damn kid, a worthless whelp, a crybaby child who pretends to be the hero, not worthy of standing over me like this!"
"How did you call me!?" Alban asked, feeling provoked as a blizzard roared through his body literally, also Alban's sudden rage scared Zenitsu and Tanjiro was startled too, Caleb along with Leo, Jupiter, Krisi, Winter and Sara, Digimon included, kept watching, also the rage of Kaigaku was replaced by pure fear.
Beetlemon, Sonic, Lucas, Gary and Ginryumon were startled while Cole MacGrath, Smoke and Killua were watching with satisfaction knowing what is going to happen to Kaigaku.
"Alban." Tanjiro says nervously, never seeing Alban so angry like that before. "Calm down."
Kaigaku's demeanor changed from one of anger to one of fear as he sensed the sudden blizzard that roared through Alban's body. The sheer intensity of the blizzard, coupled with Alban's sudden rage, shook him to his core. He tried to maintain his earlier bravado, but the fear that had taken over his expression betrayed him.
"I-I... I just... I didn't mean it... I-I..." Kaigaku stammered, his voice faltering as he tried to salvage his earlier insults.
"It's already too late for you!" Alban coldly said as he approached Kaigaku's head who wanted to beg in fear as he was being intimidated.
As Alban approached, Kaigaku's fear increased, his once-fierce expression now filled with desperation.
"W-Wait! P-Please, I'm sorry! I didn't mean what I said! I-I take it all back, just please, don't do anything!" Kaigaku pleaded, his voice trembling, the earlier bravado completely gone.
Then Alban used his right hand to grab Kaigaku's head as his thumb finger stabbed through his left eye causing him to bleed and scream in agonizing pain as Alban kept lifting the demon's head and still stabbing his left eye. Kaigaku's screams echoed around the area, the pain of having his eye punctured by Alban's thumb was excruciating.
"N-No! Stop! A-Ah! I'm b-begging you, stop it!" Kaigaku pleaded, tears streaming down his face as he tried desperately to pull his head away from Alban's grip, but to no avail.
"You deserve this for your betrayal and not repenting from your acts of cowardice, bullying and betrayal!" Alban said and then his right hand started to emanate ice which started to freeze Kaigaku's head slowly (very painful but well-deserved for a despicable being like Kaigaku).
The freezing pain of Alban's ice seeping into his head added to Kaigaku's agony, his screams becoming more intense and desperate.
"P-Please, don't! It hurts! It hurts so much…" Kaigaku pleaded, but there was no mercy in Alban's actions, the icy torment continuing to freeze his head slowly, every second a new level of pain.
Alban ignored Kaigaku's pleads until the demon's head is completed frozen and then he gripped his right hand enough to break Kaigaku's frozen head completely, Kaigaku's right and frozen eyeball fell to the ground but then it was crushed by Alban's right foot, now the once-proud demon now reduced to nothing more than a shattered, frozen head and the air was deadly silent as the remains of Kaigaku's body disappeared slowly, a stark reminder of the consequences of betrayal and cowardice.
"Kaigaku is gone…" Caleb said with slight satisfaction.
Tanjiro mainly stands there in shock, his eyes wide as he witnesses the brutal demise of Kaigaku. He had seen many demons die before, but this was different. There was a certain coldness and determination in Alban's actions that made the whole scene even more chilling. He swallows hard, unable to look away as the air around them becomes eerily silent.
"Finally." Alban said as he sighed in relaxation and smirked with satisfaction while crossing his arms behind the back of his head and turning to see Tanjiro.
Tanjiro looks at Alban, still shocked by the brutality he just witnessed.
"I... I didn't know you could be so ruthless." Tanjiro manages to say, trying to wrap his head around what just happened.
"It was Kaigaku's fault, now that bully had a well-deserved death." Alban casually said.
Tanjiro nods slowly, still trying to process the events that had taken place.
"I understand that." Tanjiro says, his voice measured. "But that was a brutal way to go. I've never seen someone inflict so much pain on a demon before."
"Only remains the other Upper Moons and Muzan, that one should deserve a well-deserved death for all his crimes against humanity." Caleb said, changing the subject.
Tanjiro nods in agreement, his expression hardening as he thinks of the task ahead. They still had other powerful demons and Muzan himself to deal with.
"You're right." Tanjiro says. "We still have a long way to go until we can bring down Muzan and end his reign of terror."
"Later we'll reach you." Sara said.
"Okay." Caleb nodded.
Then the group of four continued moving across the fortress.
(Underworld)
Just then after that scary experience, Kaigaku opened his eyes but he was in the underworld, another part of the afterlife, finding himself in the underworld, a strange and unfamiliar realm and he looked around, disoriented and confused, his memories and consciousness still shaken from the recent events in the demon world.
"Where... Where am I...?" Kaigaku asked, mumbling, his voice hoarse and raspy as he tried to get his bearings.
"Kaigaku!" A firm voice shouted at Kaigaku who turned to see Anubis, the Egypt God of Death. "Kaigaku! You stole money of Gyomei's temple, you lured a demon to kill the children in Gyomei's temple in an act of cowardice, Gyomei ended up in prison after killing the demon by fault of your actions, you bullied Zenitsu when you were Jigoro's disciple, you bullied Nezuko, you quit your humanity by transform into a demon and betraying your kind, even you tried to kill children, your crimes are unforgivable and beyond redemption!"
Kaigaku's eyes widened in shock as Anubis confronted him, listing off his crimes and transgressions one by one, he tried to protest, tried to justify his actions, but the weight of the god's words was too heavy, and he found himself speechless, the guilt and shame of his actions overwhelming him.
"I-I... I didn't..." Kaigaku started to say, his voice weak and shaky, but he couldn't finish his sentence, the truth of what he had done hitting him like a ton of bricks.
"It's already too late for you. You sank yourself into the deepest abyss and to make sure that you never come out to do the same again, you will be sentenced to Ammit forever and will never be reborn." Anubis told Kaigaku's punishment and then some hooks attached to chains stabbed Kaigaku's back and started to pull him towards Ammit and Kaigaku writhed and struggled against the hooks and chains, desperately trying to break free from the god's grip, but his efforts were futile.
"No! Wait! You can't do this to me!" Kaigaku shouted, his voice filled with desperation and panic. "Please! I'll do anything! Just don't send me to Ammit, please! I'll change, I'll repent, I'll do anything!"
However, Anubis ignored Kaigaku's words as Kaigaku continued to be dragged away as he continued to struggle and plead, but it was all in vain, the hooks and chains remained firmly attached to his back, relentlessly pulling him towards Ammit.
"No! No...! Please, I can't go there! I can't!" Kaigaku screamed, his voice laced with desperation and fear.
He doomed himself and now he has no way to get out from there, but the heroes who are in the Infinity Castle still have work to do in saving the Multiverse from Muzan Kibutsuji.