A/N: The long awaited first chapter! And hey, I think this may be the first One Punch Man reaction story! So hooray for me!

"Is everyone ready~", Blank asked, suddenly appearing and surprising many of the audience of those in the weaker classed heroes.

"We've been ready ever since you forced us to be here", Tatsumaki grumbled, understandably pissed. For whatever reason, she was forced to sit in the baby high chair since she was too short for the regular seats.

"Hey, can I ask something!", Stitch asked, standing firmly in the air with his arm raised high. Blank just looked bored, waving their hand to say 'Continue'.

"I've noticed you've yet to explain to us what's so different about this world we'll be viewing. If you could, can you explain what's different and how this impacts our lives?", Stitch asked, everyone now paying attention.

Blank just sighed at the inconvenience of having to explain. They can now sympathize with Saitama on long winded explanations from monsters for no reason.

"Everything from you heroes and the world are exactly the same in regards of your idea of 'change'. The only difference are a few select creatures~", Blank explained simply, not really seeing a reason to over explain.

Hearing that made the monsters gathered in the room look at each other in confusion or worry. The only one out was the still shivering Vaccine Man was gave nervous glances at Saitama in the back of the room. He could care less about what the ever living Hell was going on, what mattered was that he was 10 feet away from the guy who killed him!

'Please Mother Earth save me like I tried to save you!', Vaccine Man prayed to whoever was listening. At the moment, there was none.

"What's that mean?", Bang asked.

"It'll be explained so please quiet and watch the show~", Blank said as they were about to leave the room for the guests.

"Oi, wait a second!", Saitama yelled, stopping Blank in their tracks with a raised brow directed at Saitama.

"Are you a boy or a girl?", Saitama asked, everyone looking at him weirdly.

"Neither~", now everyone was looking at Blank with varying expressions, "Just watch the show~", Blank said.

With that said, Blank vanished and the world began, everyone watching.

City-A was going through it's usual routine. Men and women going about their jobs. Children at school. Various businesses doing whatever they do.

BOOOOM!

All of which suddenly comes screeching to a halt whenever a monster appears. Just like the one standing up from the massive crater.

"Wait, didn't this get settled earlier today?", Stitch asked, confused.

"It did, but again, this is different~", Blank said, hoping the world can continue. In the back, Vaccine Man was sweating even more so than ever since he knew exactly what was happening. What's worse, he's in the room of the person who killed him and the strongest heroes in the world.

"*Gulp*, I'm doomed", Vaccine Man said as he slumped in his seat, hoping that he dies as quickly as he did before.

"I'm curious to see what is different about this world", Silver Fang wondered out loud.

Aside from the purple skin, pointed ears, sharp claws on their fingers and toes, and two antenna dangling in front of it's eyes, the monster looked like a woman. After all, men didn't have such large assets like she did.

...

...

"WHY DO I HAVE TITS?!",

Vaccine Man, while scared shitless about his possible fate, was more shocked to see that his alternate self was a woman.

And a damn fine one at that.

While he was freaking out, a majority of the male audience had large blushes or "tried" to look away from the screen. A few of the woman were jealous of the attention, and a few of what the monster had that they didn't. By a few of the woman, I mean specifically Tatsumaki, who was one word away from exploding.

"Huh, so that's what's different", Saitama said, unbothered by the proportions the monster had. At the moment, he was more curious on how this effects the world, especially him.

"Odd", Genos said, also impassive.

The monster merely glanced around in disgust before jumping into the sky, where she seemed to float above the city with ease. She spread her arms wide with a guttural roar, orbs of pure energy gathering around her before casting them off towards the city, each strike leaving a massive explosion in it's wake.

"Hmph." the monster scoffed as she gently floated back to the ground, her sharp eyes watching humans fleeing for their lives. "If you humans think you can continuously hurt the earth and not face any consequences, you're wrong."

Every hero turned towards Vaccine Man with a burning glare, having attacked them earlier. Despite the power displayed on screen, that wouldn't stop them from taking him out if he attacks. Said monster wanted nothing more than to find out why he's a girl, but his attention was brought back to the group.

Looking around, he noticed that every hero was glaring at him, which was terrifying in its own right.

Wait, Saitama was staring at him, OH FUCK HE'S DEAD!

"Hey, I know what you're thinking, but please understand that I'm basically powerless here! Plus, you see what happens next, you know I die!", Vaccine Man defended, reminding the group of his death.

"You think that'll stop us from killing you if you try anything?", Metal Bat said with a glare as he readied his namesake.

"If you would, could you cease your petty fighting for after the viewing please?~", Blank asked, getting the group to stop.

For now.

-Hero Association H.Q.-

The Hero Association was buzzing with movement as people tried to get a correct evaluation on the situation.

"What's the threat level on the monster?!"

"Are there any heroes nearby?!"

"Class-A heroes Smile Man and Lightning Max are on the scene!"

Said heroes flinched as they sat in their seats with anger, knowing full well what happened in the fight. Despite their best efforts, even with other heroes, all of it was useless against Vaccine Man and his overwhelming power. They were so beaten that they were rendered unconscious, unclear as to who, or what, beat him.

-Smile Man and Lightning Max-

Both heroes, who were held in regard for their Class-A status, were lying unconscious amongst a pile of rubble that used to be a building of some sort, leaving the monster woman to continue her rampage. Other heroes, such as Class-A's Spring Mustachio, Blue Fire, Crescent Eyebroll, Class-B's Double Fall, and Class-C's Mumen Rider, and many other heroes, all valiantly fought with all they had to defeat this creature.

Or as valiantly as they could before all 31 were swatted away like crippled flies, the monster not even noticing any of them.

The workers of the HA were shocked along with the higher class heroes at how many went against that monster and lost. When they came in for the report, they claimed to have killed the monster, so what was this saying.

"Wait a minute, this is an alternate universe, so this didn't happen, right?", TTBH asked, confused.

"No.. this is what happened...", Mumen Rider admitted, his voice dripping with guilt as he slouched in his chair. Stitch and the other HA workers were shocked at that truth and had to look at the other heroes. Lightning Max and Smile Man stared at the floor, unwilling to look at their bosses with what they did.

"You lied about killing that monster?", Child Emperor asked, pointing towards Vaccine Man, who flinched at the attention. The heroes just wordlessly nodded, not wanting to face the critical gaze of their fellow heroes, especially the smug glances of the monsters.

"Wait, if none of you beat him, then who did?", Metal Knight asked, "That's the one think we don't know actually. When we woke up, it's guts was all over and we just assumed that something killed it", Spring Mustachio summarized.

"If I remember correctly, didn't King beat him?", Drive Knight said, everyone now looking at King.

"It wasn't me that killed it", King said with a Hell of a blank face.

bump,bump,bump,bump

!!!

"Wait, if you didn't kill him, then who did?", Bearded Worker asked, "I have no idea, he was a pile of guts when I got there", King said.

BUMP,BUMP,BUMP,BUMP,BUMP,BUMP,BUMP,BUMP

"I'd say it's best to continue watching before you continue asking questions that'll be answered very soon~", Blank said, stopping the group from continuing.

"Was someone there?" the monster asked while looking around at the area. "Must've been my imagi... nation." she trailed off when she saw a small girl in the distance crying her eyes out.

Everyone flinched at the sight, not liking where this is going and what is implied.

"You had better stay away from that poor girl or else!", Atomic Samurai threatened with his swords out. The monster instantly stood up and backed away in fear of his death being depicted as sliced to pieces.

"Hey hey, easy, I didn't know what I was thinking either but look!", Vaccine Man pleaded with his back to the wall as he pointed back to the screen.

"Mommy! Daddy!" the little girl cried, oblivious to the monster slowly approaching her. She stared down at the little girl for a moment before raising her hand. It almost looked like she was going to comfort the little girl...had her arm not grown ten times it's size. A sadistic chuckle escaped her throat before she clamped her hand shut. Her grin dropped when she realized that the expected ooze of pulped human girl was not seeping through her fingers. Her gaze shifted slightly to see the girl lying safely on the ground, out cold, beneath another figure being shrouded by a white cape.

They all breathed in a sigh of relief, especially Vaccine Man since Atomic Samurai lowered his blade from his neck. In the back, Saitama hummed at seeing himself in a different world, not seeing anything different. Genos had a deep look as he analyzed Saitama's form, surprised at the speed he displayed.

'Strange, from my readings, his body shouldn't be capable of such speeds, and given who he'll be up against, the outcome won't change.' Genos deduced in his mind.

"He's fast, but no where near my speed", Flashy Flash said with a calculating gaze.

"You're a fast one." the monster stated, her arm shrinking back to normal as she addressed the newcomer with mild interest. "Who are you?" She could faintly make out a smirk on the stranger before they turned to face them.

Before her stood a man wearing a yellow jumpsuit, red boots and gloves, and a plain white cape held up by black circular fasteners on in shoulders.

"Just an average guy who's a hero for fun." the man stated, arms crossed over his chest, and a blank look on his face. Also, he was bald.

'Why do people always talk about me being bald?' Saitama thought irritably.

"What kind of shit motive is that to be a hero!?", Tatsumaki yelled in anger, annoyed at such a bland motive.

"My motive", Saitama said simply with a shrug which seemed to further anger the pint sized heroine.

"But seriously, that's why you're a hero, just for fun?", Superalloy Darkshine asked, unsure if that OK. He, along with other heroes, became what they were for a multitude of reasons, most of which was to save and protect innocent people from the harsh world they all lived in.

"Yeah, I have nothing better to do with my time and it helps people in the long run so why not? Plus, my life is very boring without it", Saitama said as he leaned back in his recliner chair. Many wanted to question it, but with what's been going on in this other world, they wanted to see what happens next.

"That is...the stupidest backstory ever!" the monster guffawed before glaring at him, her whole body facing him. "Well, you told me yours, so I'll tell you mine. I was spawned from the constant pollution brought about by you humans." She then thumped her chest with her hand, her sharp teeth showing as she snarled out. "I AM VACCINE WOMAN! The earth is a single living organism. You humans are nothing but a disease-causing bacteria that eats away at her without end." Her body seemed to shift as she grew in height. "In order to obliterate you humans and your evil civilazation, the earth has given birth to ME! YOU SAY YOU DO THIS FOR FUN?! FOR FUN?!" She now towered over the man as she looked more monstrous than before. She could still be seen as a woman due to the impressive...assets she was sporting with the rest of her new body. "HOW DARE YOU CONFRONT MOTHER EARTH'S APOSTLE FOR SUCH AN INANE REASON! YET, WHAT MORE COULD BE EXPECTED FROM A HU-"

It happened so fast. One moment, Vaccine Woman was ready to strike down the foolish human that stood before her. The next?

BLAM!

Bits and pieces of her now rained from the sky, courtesy of the man's fog-dispersing punch. The man was now looking at his smoking fist, his look of boredom shifting to a mixture of anguish and frustration.

...

...

...

...

...

"WHAT THE HELL WAS THAT?!", every hero and villain shouted at once in shock, fear, amazement, and overall confusion.

"I know, isn't it annoying when a monster just goes into an over-explaining scheme when all they do is just kill?", Saitama asked. Having fought monster small and large for years he always wondered why they don't just say they want to kill instead of saying what they are.

"NOT THAT SHITHEAD! HOW THE HELL DID YOU KILL SOMETHING THAT NOT EVEN 30 HEROES COULD DEFEAT?!", Metal Bat yelled in anger.

"I just punched it.",

"Not that, what power did you use to kill it!?", Sneck yelled.

"Nothing, I just punched it, no big deal."

"She was the size of a large building and had the power to casually wipe out the better half of a city, and you just killed her with ONE PUNCH?!", Sweet Mask yelled.

"Yeah",

"BULLSHIT!",

"Well that's all I did, don't know what I can tell you", Saitama said, the only affect making the whole crowd groan in frustration.

"Again?" he muttered to himself before falling to his knees. "Another monster beaten with just one punch?!" He gripped his hands and threw his head back-

"uuugghh..."

But was stopped short of screaming his frustrations to the heavens by the sound of groaning coming from a particularly large piece of blood soaked piece of what remained of Vaccine Woman.

"Wait, that's not what happened", Vaccine Man said, sitting up in his seat, making everyone look at him again. "What do you mean?", Deep Sea King asked, "When that guy punched me, I died, I didn't come back", the Eco-friendly monster said.

"Am I weaker in this world?", Saitama asked, 'They usually die after one hit, and that guy died in our world easily', he thought.

"No, it's just that minor events and certain points that are different here, one of the big ones is that a majority of the monsters of this world have reversed genders. Added to that, most of them are stronger than normal so a few are able to survive Saitama's punches~", Blank explained.

"They have a point, that version of me is much stronger than I am", Vaccine Man said, agreeing with the God.

"Wait, how is this is suppose to effect the world we're watching?", Fubuki asked, Blank answering by pointing to the screen.

"Owww." came a tiny voice as the meat fell apart, a tiny figure fumbling out of it. "Sweet Mother Earth! That stung!"

"Uh...are you that monster's baby or something?" the man asked as he stood over the creature. It looked like a smaller, cuter verson of Vaccine Woman.

'Damn, no more hot babe', a majority of the males thought, except for Saitama and Genos who had different thoughts.

'Do monsters even make babies? That guy said the Earth made him, but would that mean the world is alive?', Saitama questioned.

'How is he so strong!? I scanned him and he is no stronger than an average person!? What is going on, are my scans wrong!?', Genos thought desperately.

"Huh?" the monster girl blinked before realizing who it was. "GAH!" she yelped before jumping back. "You rotten hu-whoa!" she cried out when she began slipping on a pool of blood, her arms flailing wildly in an attempt to keep her balance before ultimately falling face first.

"Are you okay?" the baldy asked as the little girl sat up with a groan.

"Seriously, you're asking her that!?", Zombie-man yelled, frustrated by everything, mainly Saitama's plain responses.

"Yeah, she looks like a baby right now, and it's not like she could attack me like that", Saitama said, which made sense since he was strong enough to put her in that state to begin with.

"Why do I feel so...weak?" she asked herself before looking down at her body. Her tiny body. "AHHHH!" she shrieked in horror as she began dancing around and looking at each part of herself. "WHAT HAPPENED TO ME?!"

"Well, you're small and naked." he stated, earning a growl from the girl.

"Doesn't that bother you, at all?", Mumen Rider asked, really surprised at Saitama in general. What's even stranger is that he swears he's seen him before years ago, but not clear where.

"Not really no, I'm probably thinking how she's alive despite me punching her to bits", Saitama explained.

"I know that! I wanna know why!"

"Well, are all creatures naked when they're born?" he asked.

"NOT THAT, YOU DIPSHIT! I WANNA KNOW WHY I'M NO BIGGER THAN THAT LITTLE GIRL OVER THERE!" she wailed while shaking her fist at him.

"Huh?" he blinked before the dots connected. "Wait. Are you that monster I just punched?"

"YES!" she snapped before grumbling and looking at her tiny form. "Or at least what survived."

"Blank wasn't kidding when they said we'd be stronger", Vaccine Man said, shocked on how he survived that punch that he feared with his life.

"Oh. Okay." he said before raising his fist.

"AH! NO WAIT!" Vaccine...Girl? shrieked out, waving her arms about. "I GIVE UP! I GIVE UP! DON'T HIT ME AGAIN!"

"Really?" Saitama asked curiously, his fist lowered and his stance relaxed. "Most of the monsters I meet don't usually give up just like that."

"Most monsters don't usually fight someone who can kill anything no matter their power and size with a single punch!", Subterranean King yelled, worried that he may face that fist in the future, either the one they're watching or their own.

"Look at me! I'm small! My power's are gone! I probably couldn't even stand up to a regular human!" she said in annoyance while glaring daggers at the man. "And it's all your fault!"

"How is it my fault? You were trying to destroy humanity. I stopped you." Saitama explained like it was a common thing. Which, considering how monsters and heroes are, was a common thing.

"It really is when you think about it", TTM said, "It also doesn't help that they all brag about their own goals when they're all the same", TTT said, angered.

"I was acting on behalf of Mother Earth! She wanted the evil, pollution inducing humans dead!" she yelled while stamping her foot.

"There are better ways to fight pollution besides destroying humanity." he said, causing the girl's antenna to twitch.

"Plus, you were destroying entire cities, which are on Earth, so aren't you actually causing more damage?", Child Emperor deduced. Vaccine Man was about to argue, but then thought over what he said, finding it actually sensible. He wanted to help the planet, but all he did was just destroy everything in sight, no matter what it was.

How could he call himself Earth's protector if he intentionally hurt it?!

"Rrrrgh!" Vaccine Girl growled before turning and stomping away. "You know what? Fine! I'll give up on destroying humanity! But I'll be back to kick your ass, you bald asshole!"

'You're bald too.' he thought in annoyance before he too left the scene, right when a man with three scars over his left eye a fair distance away was being praised for destroying the monster.

"Wait, your just letting her-wait, never mind, I forgot she just said she couldn't fight", Sting said.

"Why didn't you revive credit if you were the one who killed him?", Genos asked, "Yeah, why didn't you stick around to get it?", Lightning Max said, wanting to know what made the person who saved millions leave so soon.

"I was planning to eat soon until I saw the news and went to stop it, so I went to the store afterwards. I was actually on my way home with my dinner before we all got here", Saitama explained. This just raised further questions on how he's gone unnoticed given his immense strength.

"Do you do that often?",

"All the time, why?",

'That explains it',

"Alright then, that'll be it for now until I can reload the viewer to continue the show~", Blank said as they appeared out of nowhere.

"How long to we have to stay here anyway?", Puripuri Prisoner asked, hoping their world is OK without them.

"Until this world finishes, even then it will be a while, so for now, it's time to make some changes~", Blank said as they snapped their fingers.

SNAP!

"GAH!", everyone shielded their eyes from the sudden flash that seemed to have blinded them. What they didn't see was that while the flash was going out, a few of the monsters felt changes happening all over their bodies. Some felt a decrease in height, others felt an extra weight on their chests, one even had trouble sitting in their seats.

"That should do it~", Blank said as the light died out, the monsters were finally able to see what the God had done to them.

Let's just say, their reactions weren't quiet.

"AHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!", all the monsters, except Carnage Kabuto, who was unaffected by the flash. Apparently, along with Vaccine Man, now Girl, the male monsters had become female versions of them.

"Here's hoping that this'll bring some interesting reactions~", Blank said to you the audience as they watched the monsters continue screaming over their new and lost assets.

A/N: Sorry that this took so long and that it seemed rushed at some points, just know that this is the first OPM reaction story so I wanted it to be as funny as possible in the first few chapters before it becomes serious.