Hey there, peeps! Klyju back here! Since a lot of you are liking this story right off the bat, and I enjoyed writing this, I'm gonna push through and continue with this thing! However, that will mean the other stories will be delayed until then, and some things might get out of date. Oh well, more Slayerzuku! And for one reviewer who asked about how "Men can't be heroes" thing, blame FF ! AO3 and its tag system are way more convenient, and it let me tell you what you're all in for there, which I can't do on FF. Pretty bullshit if you ask me, but oh well.

Anyways, this is gonna be a slow one, but I think you all might enjoy this chapter, or not because I'm gonna pull a Sentinel Prime here and lore dump this chapter. This is gonna take a while.

Alright, as always, I don't own any of the properties here, they are all owned by their respective parties. So with that out of the way, OPEN THE GAME!

As several officers moved around the station, filing reports about the incident that occurred earlier, Naomasa and Izuku sat in an interrogation room, the Slayer helmet on the table in between them. "Once again," Hayden's voice rang from the helmet. "The Slayer cannot speak, as he is unable to do so. His Vow of Silence, as well as the time he seems to have gone without speaking, won't let him."

Tsukauchi let out a tired sigh at the response, realizing just how difficult it would be to get any answers out of the man in front of her and she couldn't use her quirk on the AI, since it wasn't a living being. "Well, can you at least write out any names for relatives? Parents, friends, anyone?" She asked.

The Slayer stood still for a few moments before he grabbed a piece of paper and pen from the side of the table. Despite the fact that it has been ages since he's written or read Japanese, he still remembered his first language, quickly scribbling down a name on it before presenting it to the detective in front of him, who gave it a look over before leaving with a "Thank you".

As she stepped out of the room, the detective turned to look at Miruko and Gang Orca, who was stationed outside by the one-way mirror. "I'm gonna have to make a call," She explained. "If he makes any funny moves, hold him down."

The Pros gave her a nod before she left to head to another room, leaving the two heroes to watch over Izuku, who merely sat in his chair quietly. "So, after all this time, he shows up again." Orca began, her eyes narrowing as she stared at the Slayer. "But how did he get this powerful? Men shouldn't be able to develop quirks."

Miruko pondered over that fact, thinking about the brutality he displayed earlier. "That's what I figured too. Ya think it might be something else? Maybe that armor he's got?" She asked, much to Orca's curiosity. "Possibly." The aquatic heroine muttered before noticing the pensive expression on her friend's face. "Something wrong?"

The Rabbit heroine shook her head before speaking. "Nothing, just… I just feel like I know this guy."

As this was going on, Izuku waited patiently in the room, all the while, Hayden was accessing the internet, going over the history of the world. "To think, this is how your world's evolution diverged." The AI said as he went over a document on the first cases of quirks. It was strange to the doctor. Over 200 years ago, a glowing baby was born, and soon after, women began to develop powers at random. This led to numerous incidents of some women abusing their powers, from the typical to the absolutely heinous. During this, the male population slowly began to decrease to make 20% of the population, especially since they seemed to never develop any powers. However, with the rise of villainy came the rise of heroes, and soon, being a hero became a profession.

"Moreso," The doctor continued as he began reading over files and missing person reports about Izuku's disappearance. "I never would've expected that a child, one born so powerless and helpless, would end up becoming one of the most powerful beings across the dimensions. How ironic."

The Slayer let out a grunt, not focused on the doctor's words as his mind drifted elsewhere. To the day when things went to Hell…

Aldera High, 10 Months Earlier

"As you all know, your final exams are coming up, so you'll have to start thinking about what career you want," The teacher announced to the class, holding a stack of papers in hand before a wry grin appeared on her face. "But who am I kidding, you all want to be heroes, Dontcha?!"

The class let out sounds of excitement as they showed off their quirks, not caring of how many rules they were breaking. This continued for a few moments before a cackle was heard.

"Don't lump me in with these extras, teach!" Katsumi Bakugou laughed out as she tilted her head down to look at her teacher. "These gals just don't have what it takes to get on my level!"

"HEY, WHAT THE HELL DID YOU JUST SAY, KATSUMI?!" The rest of the class yelled out, much to the blonde's amusement, who responded with a "Bring it on!"

"Ah yes, Katsumi, you were applying to UA, weren't you?" The teacher inquired, surprising the class. That school had a low entrance rate, and she was applying there?

"That's right, I already aced the mock exams!" Katsumi exclaimed. "Soon, I'll be the one to surpass All Might, and you can't do anything about it!"

"Oh yeah, Midoriya was also applying for UA, wasn't he?"

The laughing and chatter stopped as the greenette sitting at the back of the class flinched as the other students turned towards him before they began laughing. "MIDORIYA?! SERIOUSLY?! HE ACTUALLY THINKS HE CAN GET IN?!"

"THAT IDIOT SHOULD KNOW THAT MEN DON'T HAVE QUIRKS!"

"The-they recently got rid of that rule, though!" The sole male stated, tears forming on the corners of his eyes. "I could be the first male to get in the course!"

Before he could say any further, a palm slammed on his desk as smoke began to form from the owner's hand. "Deku…" Katsumi growled out. "I thought I told you to give it up…"

Later, as school was ending, Izuku was writing down in his notes over the new heroine that made her debut earlier. As he did this, however, he never noticed Katsumi walking up behind him with two of her lackeys until she reached out and grabbed the notebook. "What the fuck is this, Deku?" She asked angrily as the boy tried to get his notebook back. "You're still on this shit? When will you learn?"

She slammed her palms together with the book in between them, singing the thing as Izuku cried out, only to cry out louder as she tossed it outside the window. "That's so mean, Kacchan!" He cried out.

"Pfft, he's really pathetic, ain't he?" One of the girls behind him muttered as Katsumi grabbed Midoriya's shoulder, smoke slowly rising from where her palm rested.

"Listen, Deku," She began. "You can try all you want, but you're never gonna be a hero. Get it through your thick skull already."

"But I-" Izuku began before he was interrupted.

"Dammit, why don't you understand?!"

"I just need to work hard to-"

"You're a fucking idiot!" Katsumi exclaimed as her rage reached its peak. "IF YOU WANT A QUIRK SO BADLY, JUMP OFF THE ROOF AND PRAY YOU GET TO BE A WOMAN IN THE NEXT LIFE!"

Everything was quiet as what exactly Katsumi said settled in the minds of the group as the blonde realized what she just said, a look of terror dawning on her face. "I…" She struggled to find words. "I didn't-" She was interrupted when Izuku began to shake in rage, his fist balling up as he wound up his arm.

"YOU BITCH!" He exclaimed, socking her in the face and sending her stumbling back as she held her bleeding nose before he began to run outside. He quickly made a run for where he thought the notebook landed, never stopping as he quickly grabbed it out of the Koi pond, tears streaming down his face.

Eventually, he slowed down, reaching an underpass that he has never seen before. "Dang it," He muttered below his breath. "I went way off-course. Guess I'm taking a detour today."

As he walked through the dark tunnel, a tendril began to slither towards him before a large blob came up from behind. Hearing something suspicious, Izuku turned around before screaming in terror as the slime began to overcome him. "A medium-sized invisibility cloak. Thanks, kid." A watery voice said as the slime began to force itself down his throat. "You're MY hero…"

As the boy kept struggling, he felt his consciousness slipping, the world going dark. The last thing he heard was "SMASH!"

A while later, Izuku felt something repeatedly smacking his cheek, waking him up. "Hey, you alright? Come on, wake up, kid!" A powerful female voice called out to him, and when his eyes opened, they widened in shock at who it was. "Hey there, glad you're alright!" The number one Pro Hero All Might said as she gave him a casual salute.

The young man let out a scream of excitement as he quickly backed away from the heroine, his heart racing. "ALL MIGHT! IT'S REALLY YOU! WAIT, WHERE IS MY NOTEBOOK, I NEED TO GET AN AUTOGRAPH!" He yelled out before finding said notebook. He quickly grabbed and opened it, only to find her signature already there. "AH, YOU ALREADY SIGNED IT! THANK YOU SO MUCH!"

"No problem, citizen!" The optimistic heroine stated. "I figured it could be the least I could do to make up for getting you involved in my escapades! But fear not!" She brought out a pair of two-liter bottles, each of them filled with the slime villain. "The villain has been captured!"

The blonde heroine then turned on her heel, stretching as she got ready to jump. "Anyways, justice must still be carried! I will now go deliver this criminal to the police!" With that, she leaped into the air, quickly becoming a twinkle in the sky. "THANK YOU FOR THE CONTINUED SUPPORT!"

However, something felt off to the heroine, as she felt a weight on her leg. She turned to look at what it was, only to let out a surprised yell. "Hey, hey, hey, hey, hey, kid! What are you doing?! Get off!"

"But if I do that, I'll die!" Izuku screamed back, eliciting an "Oh" from All Might. He was right about that. "Fine, I'll go land somewhere close! Just hang on tight!" She told him, and it seemed to have worked since he quieted down and strengthened his grip.

Eventually, they landed at a nearby rooftop, where Izuku quickly got off of his idol to kneel onto the ground. "My entire life flashed before my eyes…" He muttered.

"That was incredibly reckless of you, young man," All Might told him as she walked towards the railing, ready to make another jump. "I'm sure that if you knock, someone will let you down the stairs. I have to get going."

"Wait, I have a question!" Izuku cried out. He almost lost the opportunity to ask, but now, he can't let the chance slide! "Can… Can a man become a hero?!"

All Might stopped in her tracks, turning towards Midoriya, but she was quickly distracted when she felt steam rise from her skin, not that the young man behind her noticed as he rambled on. "You see, it's always been my dream to be a hero. I always wanted to go out and save people from harm, even though I'm a male. Even with that, I want to show the world that I can be a hero." He said. "So please, tell me. Can a man be a… A…"

The wonder in his voice died off when he saw a steam cloud in front of him turn into wisps, revealing that the muscular form of All Might became an anorexic parody of itself, the woman in front of him having sunken cheeks and hollow eyes, the usually ever-present smile that was on her face turned into a scowl. "GAH! WHAT HAPPENED?! WHERE'S ALL MIGHT?! ARE YOU AN IMPOSTOR OF SORTS?!" He cried out in shock, eyes wide in disbelief at the sight before him.

"I can guarantee you, young man, I am All.." The woman began before she puked up some blood from her mouth.

"GAH, YOU'RE BLEEDING!"

"Hey, kid, can ya quiet down?" All Might scolded, getting his attention. "Now that you've seen this form, I guess I should explain it to you."

The heroine then went on to explain how she became the way she is now, revealing a grave injury that Midoriya realized should've been fatal. How she put on a mask of an unbreakable Symbol of Peace to keep the public happy, how heroes were always risking their lives to keep the public safe. How it was easier with their quirks.

"So in conclusion, no." She began. "I don't think men can be heroes. It's already a dangerous job, and men have it worse since they have no quirks. It's nice to have a dream, kid, but you need to dream realistically as well." With that, she transformed into her Buff state again, leaving the young man on the roof before he went towards the door to head down the stairs.

A while later, Izuku walked down the street, still in a depressed mood. "Even the best of the best said it. I can't be a hero." He muttered sadly before noticing that there was a fire nearby. "A villain fight? Must've come here on instinct. What am I even doing here anyway?"

However, as he was about to leave, he noticed that the villain looked familiar. That's when it hit him. "That's the villain that attacked me earlier!" He thought to himself. "But how? I thought All Might captured her!" That's when he realized what had happened. "When I grabbed onto her leg, the bottle must've fallen out! She's free, and it's my fault!"

"Why aren't the heroes doing anything?" A bystander asked before somebody responded to her. "It's cause the villain's got a hostage and they're waiting on somebody else to show up!"

"Wasn't All Might chasing them earlier? Where is she?"

"A hostage?" Izuku wondered out loud as he saw a person struggling against the villain's grasp, only to gasp in shock as he saw who it was. "Kacchan!"

Before anyone realized what occurred next, the young man made a mad dash towards the villain, the inferno surrounding him setting parts of his clothes on fire. "Hey, kid! Get back here, it's too dangerous!" Death Arms called out to no avail. Izuku ignored the cries as he kept running, his desire to save Katsumi overriding his fear.

The villain noticed him running towards her and said something, but Midoriya didn't care. He reached to a side pocket on his backpack and pulled out a pen, clicking the bottom of it to bring out the tip before he leaped onto the villain. He stabbed the viscous body multiple times, not a single strike doing any damage until he stabbed the villain's eye, causing her to scream in pain and loosen her grip on Katsumi. "You… DAMN BRAT!" The villain yelled out, but she was unable to do anything when All Might appeared.

"Heh, I really am pathetic, aren't I?" She muttered before letting out a powerful roar. "DETROIT SMAAAAASH!"

With a single punch, the heroine freed the two students and separated them from the slime villain, who was knocked unconscious by the blow.

"You could've gotten yourself killed!" A heroine scolded Izuku as Katsumi was being praised for her 'bravery'. "You shouldn't have gotten involved, leave it to the pros next time!"

A dejected Izuku let out a sigh as he began to walk home, his mood further soured by the events earlier. "Leave it to them next time, huh?" He muttered. "You guys didn't do anything, so why should I trust you all with that stuff?"

However, as he was walking down the street, something in his peripheral vision got his attention. He turned to look down into an alleyway, spotting a figure a distance away. He walked over to the figure, hiding behind a dumpster as he did so. At first, he presumed the figure's appearance to be a result of a mutation quirk, but he quickly realized that was not the case. The figure had a muscular yet lithe build, brown skin, and spikes over its body, but what got his attention was its eyes, which glowed a soulless red coloring that would haunt his dreams.

"What the hell are you?" Midoriya whispered as he tried to bring out his phone to call the police, but his shaking hands caused him to drop it. The sound of the device landing on the ground alerted the demon in front of him as it let out a snarl before it leaped towards him. The young man screamed as it grabbed him, and as they began to wrestle for control, a portal opened up on the ground near them, which they both fell into before everything went dark.

Izuku woke up a while later, in an infernal landscape that he couldn't recognize. He got up, wondering where he was when a voice entered his mind.

"Why are you here, child?" A booming voice questioned.

"W-what? Where are you? Who are you?" Midoriya asked out loud, his eyes darting around as he saw a multitude of demons off in the distance, some looking like the one he met in the alleyway, others varying in appearance, from flying meatballs, others like grey versions of stereotypical devils.

"You do not belong here." The voice uttered once more before continuing. "Find me, and I will bring you back to your world…"

Hearing that, Izuku perked up. Even though he shouldn't trust the voice, he was in an unknown place and whoever was speaking seemed to know more than he did. What else could he do?

He quickly regretted those words when a green portal opened up beneath him, causing him to stumble into what appeared to be a hangar base, a corpse lying nearby. Izuku picked himself back up, fear overtaking his heart before spotting the armored body. It was strange to see such a green color on military armor, he wasn't going to complain. Reluctantly, the young man looted the armor off of the body, as well as the pistol holstered on the soldier's hip. "I… I guess there's only one way out of this." He stated, finishing off his prepping by putting on the helmet before he began to run forward, taking his first steps into the madness.

After what seemed to be a day, fighting off the Cyberdemon, the Spider Mastermind, and trekking his way through the Hell that made its way on Earth, all the way back to Hell again, he finally reached the chamber that the leader of the invasion resided in, the figure's head towering over him. "You have finally reached me, child." The Icon of Sin telepathically commented. "I see that you do have some strength."

"Well," Izuku began to retort. "When everything is against you, the only thing a guy can do is to fight back."

"Regardless, you have earned your reward, child." The Titan stated, a green portal opening up behind Midoriya, who turned to look at it. "Go through it, and you will be back home, never to worry about us again…"

For a brief moment, Izuku considered going through the portal, but his heart told him not to. If he went through the portal, the people of this other Earth would be left to the mercy of the demons, something the unholy abominations didn't have. They had nothing but rage for all things living, their bloodlust being the one drive they have.

The young man tightened his grip on his rocket launcher before turning back to stare down at the Icon of Sin. "Fuck you." He cussed out before he and the demon let out a unified roar of rage, their battle beginning as hordes of demons came in to fight with their leader.

Years later, after repeating the battle twice over, Izuku found himself on Mars again, firing off a blast from his Super Shotgun at the Mother Demon, who was resurrecting the remains of the previous invasions for one final onslaught. The demon in question screeched in pain at the pellets piercing through her body, firing a wave of flames at the demon killer, who tanked through the attack, switching weapons out for the new one he found early on his trip, The Unmaker.

He fired off several rays of plasma at the being, the demonic weapon shredding off pieces of the Mother Demon before he ran up to her, bringing out his pistol and pointing it at her chin and blowing her head off. With the demon's life cut short, the body fell to the ground, leaving Izuku the victor.

As the man panted in exhaustion, he looked towards the sky, a smile of victory on his face. It was washed away, however, as he saw that the Hell portal was still open. He considered closing it off and walking away, but he knew that the demons wouldn't stop at that. He made the same assumption the first time he killed the Icon of Sin, and the fight just kept going. He knew what must be done and reached for his radio, ready for his final words.

"Doomguy reporting. The Mother Demon has been slain." He stated, pausing before he continued. "To whoever is heading to pick me up, turn back. I won't make it back to you all. It's been a good run, but these demons… they won't stop. Someone has to stay behind to hold them off. This is Doomguy, signing off… Goodbye."

And with that, he ran through the portal, punching a weak area of the entrance and causing it to collapse behind him. He brought up his shotgun, ready to fight off the hordes of Hell, his eyes burning with great fury as he fired off a shot, the area around him quickly filling up with corpses.

It was eons later that he began to break down, the stress of constantly fighting through countless dimensions proving too much for him. Eventually, he stumbled through another portal, which took him to a valley. There were no demons in sight, and the lack of any enemies was confusing to the man. Fatigue finally settled in as he passed out, the last thing he heard being the surprised voices of somebody.

He slowly came to a while later, being dragged by a pair of people before he was tossed forward. His mind, still haunted, was only able to mutter a few words as he looked towards his hands as they clenched into clawing motions. "Guts… Huge… Guts! Must… Kill them all!" He growled out.

"He still has a fighting spirit."

"In spite of his injuries." A pair of voices said, sounding genuinely impressed with the fact before the second voice spoke again. "Send him to the arena. Let him be judged like the others." With that, two pairs of arms dragged Midoriya back as he fell unconscious once again, his rage quelling once more.

It was in the arena that he found himself proving his worth to the Argenta people and the Night Sentinels. However, it was also where he made his greatest mistake and told the Khan Maykr of the realm he endured, the challenges he went through. From telling her of how he starved for days in Hell, to when he fought and killed a Titan that was Hell's champion. It only got worse after he was blessed by the Divinity Machine, for after he slaughtered another Titan, he and his squadron were betrayed by the Maykr, the Priests, and Urdak, sent to Hell for becoming too great of a threat.

"I'm so sorry, Nazar!" The green-haired man cried out as he pressed down on his ally's chest, trying to help him breathe. "This... This is all my fault!"

"Worry not, Brother Izuku..." The Night Sentinel stated softly as he hacked out blood from his mouth. "It wasn't you that betrayed us. It was the priests, and the Khan Maykr. You weren't the one that stranded us here."

"But it's because of me that they allied with the demons! If I had just stayed quiet!" Izuku cried out, stopping when Nazar grabbed his hand. The green-haired man looked at his fallen brother, who stared at him with a determined expression. "My brother, if you truly feel this way... If you feel like this was your fault… Then please... Don't give up... They are rage... Brutal... Without mercy... But you... You will be worse..." The Sentinel said. "Rip and Tear... Until it's done!"

With that, the Sentinel's life faded away, his grip dying before his hand fell from Izuku's grasp. The Outlander's eyes widened in shock as the situation finally set in. His squad was dead. He was alone. Tears fell once more from his eyes as he sobbed next to his friend's corpse. If only he could stay quiet, none of them would have suffered like this.

Nazar.

His squadron.

The people of Argenta.

The souls being tortured in Hell.

Daisy…

If only he knew how to shut up.

His sobs quieted down as he lifted up his head. There was a way.

With great hesitation, he slowly reached for his mouth, shaking nervously before he squashed away his fears, reaching down to grab at his vocal cords. With a strained grunt, he pulled at the thin layer of flesh before he ripped them out, yelling out in pain as he did so. After hacking out his blood, his coughs slowly became nothing but grunts. Now, he was unable to speak. He was unable to mess up again. With a grunt, Izuku Midoriya died... And the DOOM Slayer picked up his shotgun and put his helmet back on, ready to continue the fight Midoriya's allies have left to him, walking through the wasteland as he felt a pressure on his shoulder.

The Slayer woke up at the shaking to see that detective Naomasa with her hand on his shoulder, surprising him. It had been so long since he slept that he never realized that he did so. He didn't ponder over this too long when the detective spoke. "You awake? Good, let's go, somebody is waiting for you at the waiting room." She said as he stood up from his chair and picked up his helmet. He followed the officer out of his room, passing by a room where he saw Miruko discussing something with the other police members there before he focused on following the detective.

Soon, the pair reached the waiting room, the Slayer looking over the room when he saw a familiar plump, green-haired woman sitting nearby. The woman looked around impatiently, a concerned expression on her face, before she spotted the unmasked Slayer. She got up from her seat, a shocked look on her face, before she began to walk towards Izuku. Tears began to swell at the corners of her eyes, her voice shaking before she spoke. "Izuku?" She gasped out.

Everything was still for a while before Izuku quietly nodded. Inko then ran up to her son as the dam broke, tears flowing down her face before she hugged him. "MY BABY BOY!" She cried out. "I MISSED YOU SO MUCH!"

The Slayer didn't know how to respond at first before he simply smiled, dropping his helmet and returning the embrace. It had been so long since he felt the warm embrace of a loved one, and now, he didn't want to let go of it.

And that's a wrap folks! I hope you all enjoyed it! To those of you worried that it was gonna be left as a one-shot, don't worry, I plan to continue this! Just know that I am gonna take a break for this since this was a long one for me. I underestimated just how much backstory I had to cram in this damn chapter, so it took me a while to finish! Thankfully, I had enough motivation to push through, and more will be coming. However, I will be taking a bit of a break to recover any motivation juice before the next chapter is out. Also, yes, I know that the Slayer is acting a bit OOC, but remember, Izuku Midoriya is meeting a couple of Pros and police officers, they're good people who he won't agitate.

Anyways, I'll see you all soon, Klyju out!