Disclaimer: The following is the work of a fanfiction. One Punch Man and Monster Musume are owned by their respective creators and are used for the sake of imagination through storytelling. I do not own either one.

Enjoy.

Times has now changed in the island of Japan.

As of recently, the awareness of species other than humans have now begun due to the population of non-human liminal or simply, 'extra species' showing themselves out in public. One could say that having to discover these impossible phenomenon of anthropomorphic entities could result in the widespread fear of their beastly characteristics. Chaos could reign upon the differentiating populations (mainly humans), fear and backlash onto the existence of the extra species may result in an all out war that may never end.

Thankfully, that isn't so since the government had withheld the prior knowledge to the existence of these non-humans and through various negotiations between each representative of each species, it was decided that all species could benefit from open and peaceful co-existence. With the agreement that humans and non-humans couldn't harm one another, a legislation to incorporate liminals into 'human rights' acts to prevent individuals or groups to take advantage of members of alternate species, the 'Cultural Exchange Between Species Bill' (Interspecies Exchange Bill for short) was born. Many of extra-species have successfully integrated into human society through the act of the 'Cultural Exchange Program', thus peace was now brought to both worlds.

...

A scream echoed throughout the abandoned alleyway, a piercing sound of terror escaped from the young woman as she found herself cornered on a dead end and either side of her were blocked by the buildings around her. Eyes wide with fear for her life, her legs trembling and backing up further against the corner. There was no way out… She had no choice but to look upon her chaser that had now cornered her like a snake to a fresh mouse.

Her attacker was a behemoth of a being. A portly but nonetheless burly physique that was covered by baggy street clothing, the hood of this male covered up his entire face, all save for the protruding snout that occasionally snorted and breathed out the heavy visage of his breath. No doubt that the woman's pursuer was of orc descent. As he crept towards his prey with deadly intent, the orc couldn't help but chuckle once he was now a feet away from her.

"Buhi… Never knew that I could find a lovely lady around these parts." He praised on his accomplishment, his imposing figure near the defenseless girl and his hungry eyes locked onto his victim. The orc's massive hand suddenly grabbed hold of the woman's wrist, his grip was tight against the squirming tension the woman frantically made; the want for freedom and away from this disgusting beast was evident in her movements.

To no avail, the poor woman clenched her free hand, essentially beating it onto her attacker's arm and chest with as much energy as she could. "Let go of me!" she shrieked out yet it was soon a groan of pain as the orc's hold on her was much harsher than before. Tears rolled down from her eyes to her cheeks as exhaustion and agony took over her body, unable to fend off against the large offender.

It was seem to be the dreadful end of this sorry individual.

The orc bellowed out in laughter at the misery he inflicted upon the poor girl. "Buhihihi! Yeah, that's right. Now just learn to be a good girl or el-." His sentence was interrupted by something hitting the top of his head, his menacing grin on his face contorted into confusion as he turned to the attention to the ground. "Eh?"

The object that bumped onto his head was a simply stone. He knew the area they were in was abandoned yet he didn't think that the buildings weren't much old. With curiosity, the orc lifted his head up to see what was the source.. Only to find that out painfully as a foot came crashing down to his face. "BUHI!"The force from above was strong enough to loosen his hand, causing his grip on the woman to cease as he fell back stumbling from the impact. Only a few feet away from the attack, the orc placed a hand on his snout, now sending out pure venomous curses before glaring at the one who interrupted his 'play time'. "Who the hell are you!?"

Holding her wrist from the pain and able to catch her breath, the young woman looked to see who was the one that protected her, the back of his body was only what she saw. The individual stood between her and the orc, a rather average looking man with scruffy, spiky black hair. He simply wore a blue tracksuit and white running shoes as he stood idly, his plain, blank face gazing up at the large monster.

His stance neutral, the man rolled his shoulders a bit as he began to speak. "Oh, me? I'm just an average guy who serves as an average hero." His answer was plain and simple, wasting no time for theatrics as he then cracked his knuckles.

The man's response only angered the pig faced beast, wasting no time charging at him. The woman's face was horrified as she wanted to yell for the hero to run yet was soon surprised by the man running towards the raging monster without any sort of hesitation. She thought she was done for until finding herself further shocked by the human male's fist cocked and ready before thrown upward at the orc's chin. The knuckles collided under the jaw of the orc, the hard damage delivered to him nearly knocked his lights out until that malicious grin appeared on his face once again.

So he wants to play that game, huh? Well let's see if he likes me returning the favor! Clenching one fist of his own, the gargantuan monster retaliated with a hard hook, the track suited man's face was hit and now found his body swinging to the side and crashing onto the wall of one of the side buildings. The material of the wall now fell against the seemingly lifeless body of the young woman's savior, the rubble now on top of his damaged body.

The orc simply snickered at what he done as he rubbed the underside of his jaw. "Buhihi! Not so much for the so-called hero now, huh?" His eyes then shifted towards his original goal, the woman he had the trouble of pursuing was within his grasp once again. Walking away from the destruction he caused, he made his way towards the woman unaware of the shifting of rubble and the man slowly gathering his bearings.

Finally, I got some time to myself and this lovely gal. Ooooh how we're going to have so mu-. His walk and train of thought stopped suddenly as he felt a strange, iron like flavor coating his taste buds. Confusion and shock took over his haughty, proud emotions as he moved his tongue around the inside of his mouth. Blood? No way.. That small fry couldn't have hit me that hard! he incorrectly thought as he tensed upon finding two familiar objects that made themselves apparent along with the blood.

In a panic, the orc placed his fingers into his mouth to fish out the unknown objects before his eyes now show a look of immense dread as he saw what lied on his hand were his teeth. He can actually hurt me!?

The orc suddenly felt arms wrapped around either sides of his stomach, his eyes looked down to two human hands clasping each other for support. He now felt himself being lifted up slowly, his feet off the ground and into the air as he realized the man had recovered and was lifting him! How could a normal human like him could deliver such pain and have immense strength to add on to that?

Any reaction the orc was about to do was nonexistent, the back of his head and upper body came falling down hard on the stone cold pavement. The overwhelming amount of pain from experiencing a suplex to the ground had finally knocked the orc out, his eyes pure white from the fading consciousness he still had. A low breath of agony escaped his lips as he lied beaten and unconscious.

The woman's mouth was agape as she watched all of this unfolded. Her attacker, one of the most terrifying and brutish of the extra species was defeated by a mere human that was mainly unimpressive in terms of appearance to sat the least. She shook her head out of her stupefied state, slapping her cheeks together until hearing her hero grunting as he got up from the ground. The man arched his back forward with hands to his sides, slight popping noises emitted as he let out a sigh of relief.

"Man, I gotta start stretching more or something." He said to himself as he started to dust off whatever amount of dirt or uncleanly product he had on him. Cleaning away whatever he could, his eyes focused on the person he saved. "You alright, ma'am? You're not hurt are you?" He asked, tilting his head to the side.

Still not able to grasp at what she had witnessed, she merely shook her and only rubbed her formerly hurt wrist. "Um.. Just a bit sore but I'm sure I'll be okay." A nervous response she made as she then bowed her head in gratitude.

The man simply nodded, turning away from her as started to walk away. Looking up, the woman stood straight as she went after him. "W-Wait!" she called out, causing the man to stop and turning his head back to shift his attention to her once more. Stopping herself as well, she couldn't think of anything else to say although a question then popped up in her head. "Who… are you?"

The man stared at her for a full ten seconds after the question was made before his shoulders shrug and his feet would return to walking off. "Like I said before to Porky. I'm just a guy who's a hero for fun."

The young woman could only stare as her hero casually walked away from the scene.

...

On his way back home, Saitama wiped away the blood that had escaped away from the cut inside of his cheek and what escaped from his right nostril, his sleeve now stained with crimson. Looking down at the blood now on his tracksuit, he could only sigh but was thankful that his clothes could wash off in the laundry once he got home and that they weren't in disarray from his usual acts of heroism. Thank goodness for laundry detergent to get these stains off as he reached to his house.

The hero recounted his earlier battle as he continued his usual path to his house, finding that despite the defeat of the orc by his hands, that monster was still amongst the toughest he faced so far when arrived into the city. It's only been half a year now ever since he started training to become the hero he wanted to be and yet that goal seem so far away from him each time he faced a new threat. However despite such challenges that lie before him, he was determined enough to get past those that stand in his way to his goal.

With newfound confidence in himself, he clenched his fists tight as he looked forward with sheer determination. I'm gonna be the strongest hero!

"My, what's with that look Saitama? And why are you such a mess?" A voice stopped him as he found himself face to face to a rather attractive, long black haired woman.

"Ah.. Miss Smith." The serious emotion across his face was now replaced with his usual poker face as he greeted her. "Ah um.. I fell. Yeah, that's right..." The obvious lie was the only thing he could come up with after a long day of heroism.

The woman wore the typical attire of a government agent; white dress shirt with a black tie that was worn over with matching black blazer and skirt along with pantyhose and heels. Her hazel eyes were masked by her pair of sunglasses to finish off the professional appearance she gave off, however sharply contrasting her personality.

A slight giggle Kuroko Smith made as she smiled at the hero. "I do have to say that look you had before really suited you, but oh well." She then cleared her throat, her hands now folded behind her back. "I'm assuming you know why I'm here?"

"Aren't you always here to freeload whenever you wanna escape from the job you're supposed to do?" He blatantly said, causing the agent to nearly fall from her professional facade before catching herself.

Clearing her throat once more and collecting herself, she merely shook her head. "Seems as though your memory has failed you, dear Saitama. Since you have signed to be a volunteer to be a host family for one of the many cultural exchange students, I have brought such one for you to ensure that she is able to integrate herself amongst human society."

"Wait, wait. You told me if I signed up for this, your government could give me a house and pay with no sort of-." Saitama was then interrupted by the sudden clasp of his mouth thanks to Smith's palm covering it.

With a sickening aura around her yet a calm smile on her face, she only responded yet had an icy tone that dripped from her voice. "Let me remind you that if you read carefully to the contract you signed up for, then you had no choice but to be part of the Volunteer Host Family otherwise you'd be stuck on the streets like before, right Saitama san?" She would then released her hand off the hero's face that dripped from cold sweat of fear.

A sigh escaped from her as she rubbed her head, her normal personality resurfacing. "Besides, it's hard nowadays due to how humans are still not comfortable around the liminal species so it's only the safer option of having the Volunteer Host Family plan to help with the extra species become more accepted." Smith shifted her gaze onto Saitama, a somber emotion placed on her face. "Isn't your job as a 'hero' dictates you wanting to make peace among everyone as well?"

Those words Smith used made Saitama tense up a bit upon hearing them, his eyes looking down at the ground as thoughts rolled inside of his mind. Despite him wishing to become the strongest hero he wished to be, there was also the fact that he had obligations to save those who need him. What happened today was the perfect example for that; he was a hero through and through and who was he to turn away a new kind of population that only wished to be accepted as part of society.

"Well… Show me who's the lucky roommate then." Saitama replied as he looked up to Smith with a light smile. The agent returned the smile as she turned herself towards the car she had driven and parked nearby the hero's home. Saitama squinted his eyes to look closely as to who was inside the large vehicle, making out a beautiful girl with long bright red hair and amber eyes. Two D shaped clips were adorned on each side of her head and strangely, he found small red scales that adorn her cheeks as well as her ears protruding out as being quite large and pointed. As Smith opened the passenger door, the young female got out as Saitama stared at the student he was having stay at his place.

The redhead was that of the species of lamia. Her whole upper body was that of any beautiful girl yet her upper body.. Was that of a complete story. The most eye catching strait of hers besides her attractiveness was that of her long, red snake tail of where her lower body should be. The large tail was coming in at seven meters, crimson scales adorn it while there was a pink underbelly. The lamia wore a denim jacket over her casual dress as she followed (slithered) right behind Smith as they approached Saitama.

Placing one hand on the lamia's back, gesturing her to go in front to meet with her host, Smith would then introduce the red haired humanoid. "Saitama, I would like for you to meet Miia. She is your homestay."

Miia would fidget a bit, a good spread of blush adorn her cheeks as she was facing the man, her eyes shyly looking to him. "Um.. H-Hello… Pleased to meet you." She bowed her head to her host while Smith only chuckled at her display.

He's only doing this because he's in it for the money.. That's all there is to it. Having heard their prior conversation, the young lamia had doubts on Saitama, only thinking that he could be some sort of degenerate that acted kind for his own sake. Once she sees his face, it'll all what she needs to know about him.

When she looked back to her host once more, she was surprised that his face was... Completely neutral. No signs of any malice upon his plain face of his as he held out his hand for a shake. "Nice to meet ya. I'm Saitama." The hero simply greeted and Miia would only slowly held out hers before both hands were shook.

"Wanna take a look around, roomie?"

Well, here's the introduction to the story which has now been set. As of currently, I'm doing my best to make sure to incorporate as much as I can in order to make this fanfic an enjoyable read for both One Punch Man and Monster Musume. I will say that majority of chapters will focus on the aspects of Monster Musume more so with One Punch Man simply due to how this is only the beginning stage for Saitama's road to becoming the hero we know and love. Leave any comments on what you enjoyed and what you thought of it and I do hope you enjoyed this beginning of what will be more to come.