Demon Universe, Dark Hell Warehouse…

A number of demons were coming in and out of the warehouse as they were transporting what seemed like human children as well as human adults and other various goods in and out.

"Hmm…with that world now opting to end selling these as meat…we've no choice but to monopolize to other high quality demons while we can." said a voice as out emerged a man dressed in white with mechanical like horns, wings and a tail.

Demon who runs the Underworld

Baal

"Those fools from Dark Hell, they don't even realize that some of the demons they allowed into their ranks let me have access to all of their resources here." he said as he looked to a chessboard. "They call themselves superior…but in the end…the one who rules the Demon Universe underworld, the criminal underworld…is me, Baal!" he said getting a king into checkmate. "I'll have to thank Barbatos and Gremory when I have a chance."

"You!" a voice said as he looked at two guards standing there with weapons pointed at him.

"Oh…looks like not all of the security personnel were cleared out." Baal sighed before looking at the guards. "Hmm…you're human. I thought what little humans remained in this universe feared demons."

"That's right. We won't let you mess with Lord Thorn's business any longer!" one of them said.

"Hmm…guess I'll have to…" Baal said before the power suddenly went out. "That's…odd. Is this a power outage?"

"The hell is…" one of the guards said before the three of them heard a revving sound.

"Is…is that a chainsaw?" the other guard asked before they heard laughter and cutting.

"The merchandise!" Baal said in shock as he ran out. He could only hear the sounds of a chainsaw revving as many demons were screaming. "The hell is going on?" he growled in anger before the lights came on. He looked out to see a man standing there with two chainsaw blades coming from his arms and his head in the shape of a giant chainsaw.

"Hahahahaha! Sorry, demons. Looks like you won't be doing anything anymore." they laughed standing over the cut up bodies of dead demons.

"What is that thing? Another demon?" one of the guards said.

"Just shoot him. He's causing trouble for Lord Thorn." the other guard said as he shot at the thing. However, the bullets were sliced up by the chainsaws as the being rushed the guard and cut him down the middle. He then looked to the other guard.

"You guys are with that Dark Hell thing right? With that guy who calls himself the antichrist right? Meaning you all are bad guys. And the thing about bad guys is…no one gives a crap when I cut'em up." they said laughing as the ran at the guard.

"Knight!" Baal said tossing a chess piece as it turned into a horseheaded knight and blocked with a shield and lance. "You! Alert Gremory and Barbatos. Don't go dying like your friend."

"But…what is that thing?" the guard said as he ran off.

"There was a world…home to beings like him. It was in the Past Universe, until those idiots in the crusade went and destroyed it. But…I doubt even they knew…the Devils there, beings stronger than most demons, would suddenly appear in this universe. And all demons and devils, have feared this one thing: the sound of a revving chainsaw. No doubt…you are him…" Baal said as the Knight was cut down. "The Chainsaw Devil."

"So you know who I am. Good. However…I prefer Chainsaw Man!" the being said as he lunged at Baal.

"Rook!" he said throwing a Rook as it became a brick wall before being cut apart. "Incredible…those pieces were made from this universe's strongest metal…and he cuts them apart with ease."

"Got anymore?" Chainsaw Man asked as he laughed.

Baal threw any piece he had left at the devil only to watch them get cut apart as he ran only to look back as the Chainsaw Man leapt onto him.

The next day…

Many different members of the Universal Police were there as they were confiscating a number of illegal products and relocating the captured humans and children as two figures moved to a heavily injured Baal as they dragged him into a hidden truck.

"Damn…the leaders are not gonna be happy when they find out they lost a warehouse." said a man in a bird mask.

Demon Sniper

Barbatos

"I quite agree. What on earth happened in there?" asked a woman in a sparkly red dress.

Demon Seductress

Gremory

"Ugh…he's…real." Baal groaned. "Couldn't stop the thing…"

"He? What are you talking about?" Barbatos asked.

"The Chainsaw…he's in the Demon Universe." Baal said before falling unconscious.

Both demons looked with concern upon hearing this news.

"An alert must be made. The Chainsaw Devil…has declared war on demons." Gremory said.

Elsewhere…

A single man was walking down the street as he was approaching a small building in Mesagoza in Paldea with the words, "Team Revival Services" on the sign as they walked in.

"Hello and welcome. We're not quite ready to open yet." Riju said.

"That's fine. I'm actually here cause I heard you were hiring for a desk worker to manage the jobs and stuff." he said. "Even doing some cooking and housework."

"You sure you want that? We can't offer much in pay. But you would get your own room." Riju said. "And we are looking to hire some more guys to the team."

"Don't worry about it." he said as he turned in the application.

"Well…Denji. You seem like a shoo-in. We'll let you know when you have the job." Riju said.

"Happy to hear it." Denji said.

"Oh uh…" Riju said seeing a bit of blood on his shoulder.

"Hmm? Oh…sorry. Must be the jam from the toast I had." Denji said as he laughed and walked off. "That was close…gotta remember to clean up better…after killing those bastards." he said as his shadow showed the image of the Chainsaw Man in it as he walked off.