Chapter Text
The team that had been gathered for the raid upon the Yakuza group known as the Shie Hassaikai stood outside their base as Sir Nighteye stepped forward with a megaphone. He brought it up to his mouth however Izuku ignored it. He went over the schematics that had been shown during the briefing as he adjusted his suit. He had his hood and mask up as he took a deep breath.
"Fuck the warrant."
"You say something De-"
Before Mirio could finish his question the familiar green lightning of Izuku's quirk came to life around him and in the blink of an eye he was inside the hideout. The other raid members stood surprised for a moment before rushing forward.
"Midoriya what are you doing!?"
Nighteye received no response but they did hear screams. The first room they entered they were met with a grisly sight. The body of Kendo Rappa lay on the floor with several of his muscles carved out of his body strewn about. He wasn't breathing.
"W-what's going on? Did Midoriya do this?"
Before anyone could theorize more screams could be heard but also laughter.
"Move it!"
At Nighteye's order, most of the others booked it towards where the screams were coming from. Rock Lock stayed behind as something about Rappa's corpse felt familiar to him. The group came to a stop in front of a scene of carnage. Various henchmen working for Overhaul lay across the ground absolutely gutted but three bodies caught their attention as well as some pieces of cloth. Soramitsu Tabe laid on the ground with Izuku's metal mask split in two and shoved into his head. Yu Hojo was forced to stand as he was impaled by several of his own crystals. Deidoro Sakaki had his liver and kidneys carved out of his body lying beside him. Izuku's gloves and the top half of his hero costume lay on the ground being soaked in blood.
"Please! Mercy!"
Rikiya Katsukame fell to the floor in the opposite doorway from the one that the group had come in from. He had his hand up as though trying to stop something but black tendrils flew out and dragged him towards the owner with his screams echoing behind. Kirishima bolted forward with the others following. They wished they hadn't. Toya Setsuno was strewn across the ground dismembered. His head was split in two and they could see his brain. Hekiji Tengai was hanging from the ceiling, strangled by his own intestines. Uraraka couldn't hold it in anymore and puked at the sight.
"I knew Midoriya wasn't happy that Eri had to return with Overhaul but I didn't think he would do this!"
Mirio felt sick to his stomach. They all did. Then they heard the laughter again.
"Problem child what are you doing?"
"Problem child? Damn, I need to up my game if I wanna get you to quit with that."
Izuku's voice echoed around them but it had an accent that no one could properly place. The body of Katsukame came flying towards them, split down the middle.
"Deku! Why are you doing this?!"
"Did ya say somethin'? Cause I'm pretty sure you're talkin' to a man who just don't exist."
Aizawa's eyes widened behind his goggles.
"You're the traitor."
"I feel like you're referring to something entirely different."
The head of Shin Nemoto came rolling from the other end of the hallway.
"You're working with the League of Villains!"
It was quiet for a moment before manic laughter echoed throughout the hallway like someone had just told Izuku the funniest joke ever.
"Ya think I'm working with those guys!? HAH! Those idiots couldn't be able to afford my services!"
That stalled the underground hero as the others tried to figure out where the voice is coming from.
"Then who the hell do you work for?"
Izuku fell from the ceiling above them. The entire upper half of his hero costume had been torn off revealing a black armor underneath with a skeletal hand seeming to be reaching out displayed on his back. With a vicious swipe of the bowie knife in his hand, Aizawa let out an ear-piercing scream. He fell to the floor holding a hand to his eyes while his goggles fell to the floor cut off from his face. Izuku's quirk powered up and in the dark hallway, the light was practically blinding. In a flash, he appeared in front of Nighteye and slashed downwards cutting out the seer's left eye. Then he was gone.
"Sensei!"
"Sir!"
Mirio rushed towards Nighteye while Kirishima and Asui moved towards Aizawa. They helped him up and as he removed his hand from his eyes it was revealed what Izuku had done. A deep gash was over where his eyes should be. Aizawa could never use his quirk again. Mirio pressed against Nighteye's wound as the man's glasses laid on the ground destroyed. He winced slightly and held a hand to his side only to feel something wet. Bringing it up he saw his hand covered in blood. Izuku had stabbed him. Ryuukyuu and Fat Gum rushed after Izuku with Nejire and Tamaki following behind them.
Izuku ran into an open room that appeared to be moving. Sheathing his knife in a secret pocket on his pants he reached into the pouches on his belt and brought out four small objects. He pressed onto the top of them and they began to beep red. He threw them into the air and they exploded violently. From the ceiling, Joi Irinika fell. Izuku jumped up and grabbed an arm and a leg. He pulled as the man screamed until he tore apart at the hip. Blood and guts fell to the ground as he landed and dropped both halves of the body. He let out a breath and smiled. He turned to see four of the raid team members coming into the room.
"What's going on here? Playin' cat and mouse as ya chase me around?"
Izuku's smile turned sinister as he let out a chuckle.
"You wouldn't believe how easy it was to fool all those chuckleheads. The hardest part was listening to them go on and on and on about being heroes and so much boring bullshit. Learned plenty of interesting things though. You know the hardest part in preparing for this whole thing was making sure Bubble Girl wouldn't show up. Slip a little something into her drink and she was sick to her stomach and puking her guts up. Quirk like hers coulda really messed this whole thing up."
Despite how casual Izuku was being with the hand gestures and his stance his eyes kept watch on one specific member of the four hero group with him in the room. Ryuukyuu activated her quirk and transformed into her dragon form while Tamaki's began to change into what he had eaten recently, apparently octopus. Fat Gum got into a fighting stance and Nejire began to float.
"Welp, as mom always said."
Izuku powered up his quirk and rushed forward. He barrelled Tamaki to the side and grabbed Nejire's leg.
"Always go for the fliers first."
With tremendous force, he slammed her into the ground. He then swung her over his head and slammed her once more into the ground creating another impact crater and leaving some blood behind. Ryuukyuu rushed at him with a roar as Tamaki moved his octopus fingers to try and grab his friend. Izuku lifted Nejire again and slammed her into Ryuukyuu's head and then let go of her leg. She slammed into the wall and fell to the ground, heavily injured but still breathing.
Izuku dodged Tamaki's tendrils as he kept his eyes on Ryuukyuu. Fat Gum had rushed to Nejire's side to check on her so he was temporarily out of the fight. Izuku smirked as he jumped over the Dragoon hero and rolled on the ground as he let out a quick laugh. Tamaki's nerves were beginning to get the better of him as he began to make more and more mistakes.
"You know, you ain't the only fella with tendrils."
The black tendrils that had grabbed Katsukame came out of his forearms and tore throw Tamaki's. They grabbed onto him and Izuku gripped the tendrils before swinging them over his head bringing the hero in training to swing above his head, constantly hitting the walls as his costume tore. Fat Gum rushed towards Izuku and tried to grab him in his fat but he jumped over him and used his back as a springboard to jump up and with a flick of his wrist Tamaki was slammed into the ground with a sickening crunch. The dust cleared and his legs were revealed to be broken with bones sticking out but only unconscious.
Izuku landed on the floor and ran around the two pro heroes before grabbing Ryuukyuu's tail and lifting her up by it. He slammed her into Fat Gum but the BMI hero's quirk kept him safe. Izuku continued to slam the dragoon hero into him as he slowly drained the hero of his fat reserves while also injuring Ryuukyuu. Soon Fat Gum was slammed into the wall, completely deprived of his reserves. Izuku dropped Ryuukyuu and she fell to the floor in a heap having fallen unconscious. Izuku let out a laugh before rushing down the corridor opposite the one he had entered from.
Running down the hallway he saw a few of Overhaul's henchmen and his aide Hari Kurono. Unsheathing his bowie knife as he ran he stabbed it into the aide's head diagonally and as he moved twisted it before wrenching it out of him. The rest were quick work to kill. Running further into the compound he began hearing a voice that was laden with frustration.
"Damn Chisaki, yer goons are pretty fucking weak!"
Kai Chisaki stopped in his tracks as he looked towards the entrance. He saw the hero that had been there with Mirio but they had been wearing a mask so he hadn't recognized them. But the voice was familiar.
"I gotta say you can imagine my surprise when my little cousin, who you told us had died due to a drunk driver, came running out an alleyway barefoot and covered in bandages. At first I'm thinking "Chisaki must've been tricked!" but then you waltz out of those shadows and dispel all those theories. We are all so very disappointed in ya."
"Izu!"
Ert smiled upon seeing her cousin who gave her a quick little wave with the hand holding the knife.
"I mean I had been planning to visit you since I was in the area to letcha know that Pops was awake."
"He is!?"
"Yeah! Mom found this underground healer that worked wonders for him. He doesn't remember how he went into the coma but I'm starting to think you're responsible for that. I called in and the vote was unanimous. Pops was sad to see everything he'd built be torn down but you perverted everything he built. Your lab should be on fire right about now."
Izuku disappeared in a blur and then reappeared with Eri by his side and Chisaki's mask in his hand. He folded it in half and put it in his back pocket. Overhaul went to move his hands when the pain set in. He looked at his hands to find that all of the skin on his hands and forearms had been cut off and lied at his feet. He let out a blood-curdling scream as Izuku walked towards him.
"The families have ordered your execution and I was chosen to do it. Kai Chisaki, for breaking the rules of the families I sentence you to death, may your soul never find peace."
With practiced ease Izuku severed Chisaki's head from his body before powering his quirk up, grabbing Eri, and running out of the hideout. None of the heroes were able to stop him.
~Later at a hospital~
Rock Lock stood before Nighteye as the seer lay in a hospital bed.
"The methods used were those of a group that serves the crime families of Japan. They are known as The Skeleton's Hand and have been around for a long time. I had gone to order reinforcements which is why I wasn't there. I've had a couple cases involving them."
Nighteye didn't say anything, he just continued to look at his hands. Rock Lock left the room.
"You know, I feel like I know what yer thinkin'."
He turned to see Izuku sitting on the window sill. The only thing from his hero costume remaining was his boots. He wore Chisaki's mask but it had been modified giving it a more curved peak and made to fit his face. Nighteye grimaced and pressed the emergency button but no alarms rang.
"What do ya take me for? Some kinda amateur? Had that turned off."
"You've stained All Might's legacy."
"Who do you think taught me how to use One For All in such a deadly manner?"
Nighteye's eye widened before it settled into a glare.
"How do you think One For All managed to stay out of All For One's hands so easily? Illegal shit. The first three users were freedom fighters. Fourth was a notorious hitman. Fifth and Nana sold information relating to wielders of quirks that All For One wanted, keeping them away from him and killed heroes on his payroll. Sixth was a vigilante who killed the heads of several of his operations. Sensei though? Sold info of several heroes that were corrupt to the highest bidder and killed plenty of people in his skinny form."
"Why are you telling me these lies?"
Izuku's eyes came alight with mirth.
"Why would I lie to a dead man?"
Nighteye tried to scream but his mouth was covered. The last thing he saw was the glint of Izuku's bowie knife. He would be found dead with a middle finger carved into his chest.