Demon Slaying at a Reasonable Price Chapter 12: The Greatest High, a JoJo's Bizarre Adventure + Demon Slayer: Kimetsu No Yaiba Crossover fanfic

A Few Days before Giorno arrived at the village...

"Lady Koccho, someone is here to talk to you." Aoi said as Shinobu looked at her.

"Oh? has Rengoku and the others have returned?" Shinobu asked.

"Um, no...It's another foreigner." Aoi said as Shinobu was surprised.

'Another foreigner...it's him.' Shinobu thought as she prepared to meet Giorno's dad.

"Let him in." Shinobu said as Aoi left the room.

In a few moments, Diego walked in. He was wearing what Dio wore in Phantom Blood.

He had a crate in his hand. Presumably the UV lights were inside it.

"Are you, Shinobu Koccho?" Diego asked.

"Y-Yes! I am Shinobu." Shinobu said as Diego put the crate down on the floor.

"So...what is your relationship with my son?" Diego asked as she smiled. She had to keep that smile on her face to look composed.

'I rarely ever deliver things but since it was Giorno who ordered it for her, I had to come.' Diego thought.

"My relationship with Giorno?" Shinobu wondered. What was her relationship with that boy.

"Are you like his girlfriend?" Diego asked.

"Eh?!" Shinobu exclaimed in surprise blushing.

'She's blushing, did I hit the mark? I'm proud of Giorno. He even got himself a beautiful woman.' Diego felt proud.

"No! No! No! No! We're just...fellow doctors!" Shinobu said.

'Shit, that could've been the case.' Diego thought.

"Fellow doctors, huh?" Diego put his hand on his chin.

"Y-Yes! We're just fellow doctors!" Shinobu clarified as Diego sighed.

Diego was near a shelf with many things including a glass bottle in it.

There was a string attached to the glass bottle. Shinobu prepared to see him stop time and this was a test.

Naho pulled the string which pulls the bottle out of the shelf and starts falling.

Shinobu watched the bottle fall near Diego and waited to see what he would do. So far Diego didn't even look at the bottle nor paid attention to it.

Suddenly the bottle vanished from her sights. She was still surprised. She looked up to find the bottle back on the shelf.

'Giorno wasn't exaggerating when he said that his father can stop time! I still don't realise what happened!' Shinobu thought in astonishment. No stand ability can top his.

'THE WORLD noticed the string that was attached to the bottle...Was she trying to test me?' Diego wondered.

"Where is Giorno?" Diego asked wiwas a serious tone. Shinobu tried to maintain her composure and breathing.

'This must be the menacing side of him that Giorno told me about.' Shinobu thought.

"He's at the Kuoran Village." Shinobu informed.

"Why is he at this 'Kuoran Village'?" Diego asked as she was silent trying to find an answer.

"He-he went there to slay demons." Shinobu answered.

"Demons?" Diego asked curiously.

"Yes, man eating demons." Shinobu answered.

'Cannibals? I didn't think this country would have such a problem.' Diego thought.

"They're not humans. They're monsters who rejected their humanity and-"

"Your next line will be, it's our job to slay them." Diego predicted.

"It's our job to slay th-What?!" Shinobu was surprise. She tries to maintain her composure.

'I knew I saw that uniform somewhere else. They are demon slayers.' Diego thought.

"It-its as you said." Shinobu answered.

Diego then showed her the string that was attached to the bottle as she gasped. It seems Diego found out.

"It seems Giorno trusts you enough to tell you my stand ability." Diego said.

'She has to be his girlfriend. Giorno doesn't trust a lot of people.' Diego thought.

"But you had to test me? Isn't Giorno's word enough for you? Can't you trust him like he trusted you?" Diego glared at her menacingly.

Shinobu tensed up in fear while trying to maintain her breathing. It seems Diego was offended.

Suddenly a hand was on her shoulder. She glanced behind her to see Diego.

'He did it again! He stopped time!' Shinobu gasped looking at him. She had a surprised face but still kept her composure.

"Does that mean are you trustworthy? I don't think so." Diego slowly squeezed her shoulder as she was frozen in place.

'Oh...no...' Shinobu thought in despair.

"Your breathing is even and you kept your composure. I suppose Giorno trusted you for your prowess." Diego said taking off his hand and walking away.

Shinobu stayed there, frozen for a few seconds until she started sweating and was trying to catch her breath.

'I thought I was done for!' Shinobu thought as Diego walked closer to a bookshelf.

"How powerful are these demons?" Diego asked taking a book.

"M-Most of them are weak but there are some stronger ones like the demon king and his Twelve Kizuki." Shinobu informed.

"How strong are these 'Tweleve Kisses'?" Diego asked as Shinobu snorted.

"Well, upper six were two demons who could bend their poisonous blood and attack with obis." Shinobu informed.

'The hell is obis?' Diego thought.

"Sounds weak, I'm pretty sure my son can kill them." Diego mused.

"They can move faster than sound." Shinobu said.

"Faster than sound? Too slow." Diego said and closed his book.

'Too slow for you I suppose... you can surpass time. Valentine can surpass dimensions. Giorno can create life.' Shinobu thought about how strong they were.

"Please, sit down. We'll get you a cup of tea." Shinobu offered gesturing at the table.

Diego shrugged and sat down. "Aoi, please bring the tea" Shinobu ordered and sat down.

"These demons can move faster than sound and have deadly attacks. What else?" Diego asked interested.

"They can heal instantly." Shinobu said.

"Explain." Diego said interested.

"They can grow back their limbs in an instant including the head." Shinobu explained.

"How do you kill them then?" Diego asked.

"Well, sunlight is their weakness. Most of us use Nichirin blades to kill them." Shinobu said.

'So that's what the lights are for. Too bad they aren't mobile enough.' Diego thought.

"Interesting...I can see them being a formidable opponent." Diego said interested.

Aoi arrived with the tea and puts the cups down on the table. "Do you need anything else, sir?" Aoi asked and Diego shook his head.

"I need to find Giorno. Can you show me where Kuoran village is?" Diego asked..

Present time...

Things were looking unbearably horrbile in the Infinity Castle...for the demons that is.

The plan was that all the remaining upper moons will capture Giorno here and force him to make the Blue Spider Lily.

But Giorno can create plants out of objects and there are and "Infinity" amount of objects in the Infinity Castle, not to mention the castle itself.

So naturally, it already made it uncomfortable for the demons that there's a...

"A fucking wisteria forest!?" Nakime cursed in fury. Wherever Giorno steps, a tree grows out of there.

Uncomfortable would be the correct way to describe it for the demons, same way polluted air would be uncomfortable for a man.

But they can't do anything about the plants because the damage keeps returning to them.

Not to mention that Giorno's gun was also brought inside the Infinity Castle. Which made it worse for the demons.

Kokushibo died first. He died from wisteria poisoning. There was no saving him.

"His fate was sealed the moment I shot him." Giorno said.

Then was Hantengu. Giorno just shot his main body which seales his fate and doesn't allow him to use his blood demon art that much.

Giorno did notice multiple demons appearing out of Hantengu so he had to waste some bullets to kill them and get closer to the main body.

Giorno had to punch Hantengu's main body first, stunning him.

Then he scanned Hantengu with Gold Experience and found the actual main body.

Then he put a bullet in it that turns into deadly wisteria pathogens.

So that's how Giorno fucked Hantengu over.

Then was Gyokko. "Now killing him was difficult." Giorno mused dodging icicles from Doma.

Having multiple pots, Gyokko would just emerge out of another after being shot in the head.

But after noticing Gyokko's boasting about his pots, Giorno figured that he loved his pots.

So Giorno called his pots "Pisspots" which got him furious and and got closer to Giorno who used his life shot punch to stun the demon.

Then he shot him in the head and destroyed his pot, leaving him squirming in pain.

Gyokko died soon after. Now the only upper demon that was left was Doma.

"Wintry Icicles!" Doma exclaimed manifesting icicles.

Giorno got hit the shoulder by one of them but dodged the rest.

Most of Giorno's attacks were useless against Doma.

Doma freezes his wisteria forest who reflects it back but Doma's cold temperature doesn't do anything to him, so the the flowers end up dying from the cold.

Same goes for his pathogens from the bullets. They make little progress before dying from the cold.

"Not to mention the biwa demon..." Giorno groaned.

She was keeping him near Doma. She didn't let him get away while staying far away from them.

"Freezing Clouds" Doma swings his fans which creates an icy wind blowing towards Giorno.

"Shit!" Giorno jumped up a walkway to dodge it. He barely dodged it.

'Every one of his swings create a blizzard...' Giorno thought and climbed up.

Only to see Doma standing behind him smilling. "Hello!" Doma said as Giorno stumbled backwards.

He aimed his gun at Doma's head who smiled. He was ready to be shot.

'I only have one bullet.' Giorno thought and clicked the trigger or tried to.

"It's frozen!?" Giorno exclaimed in shock. His pistol was frozen making him unable to fire.

Giorno tried to get up but then saw that his legs were frozen. He couldn't move from that spot.

"Well well well, what is your name?" Doma asked.

'He's within Gold Experience's range but... I am still frozen, unable to move' Giorno thought in dread.

"It's...Giorno." Giorno answered shivering.

"Well Giorno, you've killed 3 upper moons in a hour! That's an amazing accomplishment!" Doma praised as they were confused.

'He's praising him?' Nakime thought.

'It took me hours.' Giorno thought and glanced around to see Nakime a bit far away.

"You have an amazing power. I've never seen anything like it." Doma continued.

"But since you killed my friends I must kill you." Doma said ready to swing his fans as Giorno clenched his teeth.

"No stop!" Muzan screamed in Doma's mind.

"Muzan-sama?" Doma asked confused.

'The demon king.' Giorno thought in dread.

"Don't kill the human! I need the Blue Spider Lily!" Muzan ordered.

"Oh right, I forgot." Doma scratched his head sheepishly.

"So Giorno, we need that Blue Spider Lily. We won't kill you if you oblidge." Doma said.

"I can't create it...not in this cold. No lifeform can survive this much cold..." Giorno said.

"Oh, sorry." Doma said and stomped his feet on the ground and all ice disappeared.

Giorno was no longer frozen. Giorno picked up a piece of wood from the floor.

"Watch." Giorno said and tossed the piece of wood above them. All the demons were looking up at it.

It made an unique noise and turned into the Blue Spider Lily.

'The Blue Spider Lily!' All the demons thought.

"Grab it!" Muzan ordered as Doma leaped to catch it...

Only to see that he hasn't moved from his place...no his body hasn't.

"What is this?!" Doma thought as he saw his own body looking down.

"I feel faster!" Doma noticed how quickly he was moving. It was like he's no longer in the limits of his body.

He saw Giorno standing with his arm raised, moving slowly.

He swung at Giorno but his swings phased through. It was like his soul was dragged out.

He noticed something. Giorno was aiming his gun but not at him.

"I unfroze the gun!" Doma realized and Giorno fired his last shot.

Doma looked at the direction the bullet was slowly whizzing towards, it was at Nakime!

"Shit!" Muzan cursed. He could see through Doma's beserked brain.

Doma looked up to see the flower again still in the air.

'What do I do?' Doma casually asked Muzan. Eventaully his senses would come back.

Muzan was distressed. If Doma saves Nakime then Nakime could bring him there and capture Giorno. Muzan doesn't even kmow if he can take on Giorno like Doma. Nakime is the most convenient demon he has.

If Doma goes after the flower then his evolution is guranteed.

"Nakime has enough blood to be considered a lower moon. She should be able to dodge it. Grab it!" Muzan gave the order.

"Yes, Muzan-sama!" Doma said ready to jump.

Doma's senses returned to normal and the bullet whizzed towards Nakime.

"Nakime, watch out!" Muzan warned as Nakime raised her eyebrow.

"Mu-" Nakime couldn't even finish. She was shot through the eye and the bullet entered her brain.

The bullet turned into wisteria pathogens and Nakime was poisoned.

Doma jumped up to grab the flower while Giorno jumped down to get away.

The Blue Spider Lily was within his range and Doma caught it. "I got it!" Doma said and landed.

He looked down to see Giorno running into one of the rooms.

"Bring it to me. We can capture the boy later." Muzan ordered.

"Hey, Biwa woman! Can you-" Doma was about finish but something fell on his head.

"Huh?" He looked down to see a lantern. A lantern fell on his head?

"Nakime wasn't able to dodge. The Infinity Castle will collapse." Muzan informed him.

The Infinity Castle was crumbling apart and they felt like they were being pushed.

'The castle must be ejecting them out from Nakime's Dimension' Muzan thought.

It was an hour till dawn in this small village. There were no signs of life here.

Probably cause the demons ate all the people a few hours ago. Then they ran away because they thought a Hashira was after them.

Suddenly cracks appeared on the ground. Something huge emerged out of the ground.

It was like a house was buried there and then came back to life. There were many broken doors and ceilings.

Then something exploded inside that moves the debris away.

"Scattering Lotuses!" It was Doma he used his icy blood demon art to blow the debris away.

"Well...upper two." Giorno said as Doma looked to his right to see Giorno...fine?

'What happened to his shoulder wound?' Doma wondered.

"It seems that you used your blood demon art again which killed your flower" Giorno said.

"Huh?!" Doma looked at his hand to see the flower dead from the cold.

"You CUNT!" Muzan cursed at Doma's incompetence. Doma flinched hearing that.

"Well, can I have another?" Doma asked smiling.

"What's in it for me?" Giorno asked.

"Well...you get to live?" Doma said.

"I'm pretty sure if I die then you won't ever get the Blue Spider Lily." Giorno said.

"Huh, I guess you're right about that..." Doma said putting his hand under his chin.

'What can I offer him?' Doma asked.

"Ranks in the Twelve Kizuki." Muzan suggested.

"Ranks in the Twelve Kizuki." Doma said.

"And what? Serve someone like Muzan?" Giorno asked as Doma was about to answer.

"Fuck it. Just capture him. I'll figure out a way to toture him." Muzan ordered.

"Well I guess we-" Doma was about to swing his fans but was interrupted by Giorno.

"I'll do it on one condition." Giorno said as Doma and Muzan was surprised.

"What is it?" Doma asked.

"You have to kill him." Giorno said pointing at someone behind Doma.

He looked behind to see a man similar to Giorno.

"Ho, you certainly know how to pull my strings, Giorno." Diego said.

'They have similar blood. Are they related?' Doma wondered.

"Shut up father. I killed three upper moons today. I'm tired." Giorno said walking back.

"So much for the strongest demons." Diego sighed and got into a stance.

"Be carefull Doma, he's probably stronger than the boy." Muzan said.

"Lotus Vines!" Doma manifested his ice lotuses that grew icy vines to slash at Diego who just stood there.

'Why isn't he moving?' Doma wondered as suddenly Diego vanished.

"What!?" Doma was alarmed. He looked behind him to see Diego posing menacingly.

"Useless useless useless..." Diego muttered as Doma swung his hand to blow Diego away with a blizzard.

Only to see his hand is gone, like it as been cut clean off.

"When di-"

"Muda!" THE WORLD kicked Doma in the shin, sending him flying up vertically.

Doma stopped in the air and was falling down towards Diego.

Doma and Muzan who were witnessing this were scared. Giorno's father...they couldn't understand him. He's in another league!

"Rime — Water Lily Bodhisattva!" Doma manifested a buddha statue made of ice in the air. He planned to slam Diego with it.

"Take this!" Doma exclaimed in uncertainty as the hands of his statue got ready to slam Diego.

Doma felt fear...in his cold dead heart. The statue hand slammed Diego.

Only for Doma to to see that the hand shattered when it impacted.

"What?" Doma said confused. He couldn't see the stand shattering it.

"Useless useless!" Diego said as he leaped towards the statue.

"Muda! Muda! Muda! Muda! Muda! Muda! Muda! Muda! Muda! Muda!" THE WORLD punches shattered the statue.

"How!?" Doma couldn't understand it. He wanted to get away.

Doma leaped away, only to see that he's back to where he was. "What!?" Doma was scared shitless and all because he couldn't understabd what Diego was doing.

"Hey." Diego put his hand on Doma's shoulder who was frozen in fear.

'This is the second time here.' Diego thought.

"Did you know that the planet is round and spins around the sun?" Diego asked.

'What?' Doma and Muzan were surprised. That question came out of nowhere.

Doma nodded. "So think about it, if you're high enough, you could see the sunrise before us. The French have proved it." Diego said. (Source: Trust me bro)

"I...suppose?" Doma said. He didn't know where this was going.

"Muda!!" THE WORLD kicked Doma in the shin again that sends him flying a few meters in the air.

"He's going to send you flying?" Muzan wondered.

"I'm going to shoot you towards the sky like a bullet." Diego said as Doma started falling again.

He didn't do anything because he wanted to see what Diego would do.

"You're the bullet." Diego said as Doma got closer.

"THE WORLD!" Diego exclaimed as time stopped.

"...is the shell." Diego said. (Time stop is the shell)

"This is the gunpowder." Diego said as THE WORLD started punching Doma from the bottom.