A/N: This story contains Manga Spoilers for everything that takes place after Season 5.
Viewer Discretion Advised.
Prologue
My name is Tenko Shimura and I'm the leader of the League of Heroes. I've formed the crime-fighting group in order to take down the nefarious villain All Might and his successor Deku.
The little brat has caused us nothing but trouble with his quirk All For One. We were hot on his trail and managed to find ourselves in another world where Heroes were Villains and the Villains were Heroes.
It was shocking and discouraging for us to stay low and fight crime as vigilantes. But it was all for the greater good!
Until we can find and defeat Midoriya and find a way to return home, we are basically stuck here for good.
Hopefully, we will gain allies along the way. We will need it if we want to defeat Deku once and for all.
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On the other side of Japan lied two tired and overworked gentlemen in a police precinct.
"What is going on?" Shouta groaned as he went through different police reports with Naomasa.
"Hey, I'm just as confused as you are." Naomasa said.
"It doesn't take a genius to realize the League of Villains are all over Japan committing acts of vigilantism. They are disguised but the quirk description matches up." Shouta said.
Naomasa nodded in agreement. The whole thing sounded fishy.
"But why would they do that?" Naomasa asked.
Shouta shrugged.
"Did turn over a new leaf?" Naomasa suggested.
Shouta scoffed. He had had his fair share of dealing with vigilantes and villains in the underworld and this isn't it. Something else must be going on.
"Maybe they are trying to change their image. Get the public to trust them for some evil plan." Shouta insisted.
Naomasa hummed.
He wasn't even sure what to make of it.
Naomasa looked at a photo taken by a civilian. It was shaky and low quality due to being taken at night but it showed a picture of Himiko Toga in what looks like to be a hero suit.
"Witnesses reported the League calling her Identity Thief now." Naomasa said.
Shouta snickered. It was fitting.
"Of course." Shouta mocked.
"Here's what I think. The League has been staying for a while and they started 'masquerading' as Vigilantes, right?" Naomasa said
"Right." Shouta answered.
"What if they are serious about being vigilantes? Most of the League joined because of Stain ideology. Perhaps they are returning to their roots?" Naomasa explained.
"Maybe. Maybe not. I don't know. We need more evidence." Shouta said.
"There is another thing that bothers me. They have a new member." Naomasa said.
Naomasa explained the new member was mostly a young man in his late twenties to early thirties who wore a black mask. It appeared he had a matter manipulation quirk.
"Matter manipulation?" Shouta questioned.
"Yeah! It kind of reminds me of the Shie Hassaikai's leader's quirk. Also known as Overhaul."
Shouta had a bad feeling about this.
"How was the League able to convince a Yakuza Leader to become a vigilante?" Shouta wondered.
"That is what I'm trying to find out!" Naomasa snapped.
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"I'm exhausted." Kai said while taking off his mask.
"I know." Tenko said as he patted Kai's back.
"We still haven't found any clues on where Izuku went, Boss!" Himiko said.
The Heroes now Vigilantes were in an abandoned warehouse. They were lucky enough to find food, water, and other important necessities in a short amount of time.
"We aren't being slick anymore. The Police have already taken notice of us." Touya said.
"I can't go out finding any more. I need more of my antipsychotic medication." Jin said.
"We're working on it." Atsuhiro said as he put his top hat away.
Shuichi was on his laptop playing GTA. He needed to unwind and relax. Being a Vigilante was stressful. They could be caught any moment.
"I could probably make the medication you need but I need the ingredients." Kai added.
"What do you think Boss?"
Tenjo paused to think. Now the police eyes are on them now, it would look bad if they just start to steal medications or ingredients.
"We could make one final hit tonight. There is a corrupted pharmaceutical company that overprice their medication in order to make a 'profit.' Tenko said.
The Vigilantes nodded. They knew exactly what they needed to do.
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A small task force went.
Their leader, Identity Thief, and Overhaul went.
"I wish Kurogiri was here with us. It would make it easier." Himiko whispered.
"Shh." Tenko said.
A security guard was making rounds.
Tenko gestured the signal with his hand.
They instantly took down the guard in a blink of an eye.
Kai took out his phone and pulled up the map of the factory.
"You need to make it the basement. That's where they have the medication and ingredients I'm looking for." Kai said.
Tenko and Himiko nodded before they spilt up. They went to the top floor to find evidence of the company's misdoing.
Kai on the other hand went to the basement alone.
Tenko knew Kai was a lone wolf but he trusted him to be safe by himself.
Tenko and Himiko were tipping around the corner when they saw Eraserhead.
Tenko quickly pulled Himiko back.
"We need to retreat." Tenko whispered.
They tried their hardest to calm their breathing as they couch on the floor in the hallway adjacent to one Eraserhead said.
"What are you guys doing?" Eraserhead asked nonchalantly.
He already activated Erasure.
Both Tenko and Himiko couldn't help but scream.
They knew this world's Eraserhead was a good guy but they still have nightmares of all their fights with the Villain counterpart.
Eraserhead in their world was a mentor to Deku. Almost like a father to him.
"I'm sorry Eraser." Himiko said as she tried to kick in stomach.
Eraserhead quickly dodged all of Himiko's blow.
Tenko quickly turned on his earpiece and told Overhaul to get out of there. Eraserhead is there.
"Ooh? Overhaul is here too." Eraserhead thought.
Tenko quickly did a flip in mid-air and knock Eraserhead of his feet.
Eraserhead's eyes widen. He was surprised to see Shigaraki so agile and flexible.
"He must be training." Shouta thought.
Eraserhead tried to bind the villains with his scarf and was thrown off guard by how easy they avoided his attacks. They were like acrobats.
"Himiko, aim left!" Tenko shouted.
Himiko did as told and aim for Eraserhead's right and finally render Eraserhead unconscious.
Tenko and Himiko sighed in relief.
"I feel bad though." Tenko said.
Himiko quickly tied up Eraserhead with his own scarf. When she was done, Tenko left a small notepad sheet saying they were sorry with a frowny face he drew on it.
"Overhaul, did you get the stuff?" Tenko asked.
"Affirmative." Kai said.
"Good." Tenko replied.