A/N:

-I do not own My Hero Academia/Boku No Hero Academia or One Punch man.

-In this AU, Saitama lives in the world of My Hero Academia where there is no hero association or any other characters from One Punch Man except for Saitama (I do apologise for that).

-Saitama also does not possess a "One Punch" Quirk but he still did his 3-year training regimen to become the One Punch Man.

-In this AU, Saitama was born quirkless, so he trained himself to become a hero to fight against evil quirk users, but always beated them with one punch. (Without killing anyone)

-Saitama is familiar with the context of Boku no hero Academia

The sky was bright and full of birds chirping as they flew across the breezing air. Saitama was sleeping on his futon in his apartment peacefully. Saitama would sometimes dream about facing an opponent who could rival his strength to fill the void inside of him, the feeling of exhilaration of a fight. He became too powerful to the point where every villain he met would be effortlessly taken out by a single punch, at that point Saitama never felt the excitement of a fight, as he would always win, unsatisfied.

It was 9:00am in the morning and Saitama still slept on his futon in his apartment as if he was frozen, until his alarm clock rang. As Saitama heard the alarm, he raised his fist and slammed his alarm clock, knocking it through the floor. Saitama, feeling aggravated, woke up from his futon and walked to the kitchen to prepare breakfast for himself. He opened the fridge, only to find out that there was nothing to eat. He became astonished.

He checked again, but there was barely anything in the fridge, there weren't even any scraps of crumbs left. Saitama, feeling shocked started to search his entire apartment for any spare food left, only later to discover that there was absolutely nothing to consume. He decided to go out for breakfast instead, only to find out that life had slapped him with a stroke of bad luck, that he had no yens either in his wallet. Saitama, feeling defeated sat on his futon as his stomach growled in anger as he could not afford food to tame it. Saitama, feeling hopeless turned on the television to entertain himself to postpone the situation.

As time passed by, he kept flicking between channels as his boredom got the better of him. He decided to see the news channel to find something intriguing. As he flicked to the news channel, the screen was filled with a whole crowd of news reporters, all which were attempting to barge inside a building called UA High.

There were two oddly dressed men in front of the building doors trying to stop the news reporters from getting in. One of the men had very long, dark and messy hair along with a very long scarf around him. He wore dark clothing and had an empty facial expression, which honestly made him look more like a hobo. The other man on the other hand seemed looked completely different to the other man beside him. He had a long yellow and curved hairstyle that pointed upwards and a speaker around his neck along with some headphones covering his ears. They were desperately pushing the news reporters away, but were outnumbered.

Saitama slowly became fatigue as he grew weary from his aching hunger, so he continued to watch the news as his only source of entertainment. Each reporter kept on talking about UA High, being the best heroic school there is.

As Saitama heard the news reporters exclaiming more and more about UA, his curiosity started to grow as he became a bit interested in UA High. He turned off the television and got into his desktop to go online to research more about UA. As he read more about UA, he learnt about its academic goal to train and educate students to become professionally trained heroes in the future.

He scrolled through the website and noticed a link on the website saying that they are hiring professional heroes for certain job opportunities in UA. As Saitama read the link, he thought to himself for a moment if he should apply for a job in UA. Since it was the best heroic school in the country, the salary for the staff must've been high. He was never good at getting into job interviews, but if it involved hero work, it might actually work out. After some heavy thinking, Saitama finally filled in the form and sent it back to UA High.

Just as he finished sending the form, he got off his desktop and sat on his futon. He was starting to reconsider if he even made the right choice. The only reason why Saitama even applied was to earn some income for his meals. Although he did feel a bit reluctant sending in the form as he was never interested in getting a job. Even if he became a hero as a hobby, he didn't want to convert it into a job.

The sky started turning orange and the birds flew back to their nests as they landed on Saitama's apartment. Saitama was lying on his futon, staring at the ceiling as if it seemed so interesting.

It was 3:30pm in the afternoon. He got off his futon and went back to his desktop to escape his own boredom. As he got on his desktop, he noticed that he received an email. He clicked the email. The email was from UA High saying that his application form was accepted and an appointment was already booked at 4:00pm today. As he read the appointment time, he became flabbergasted of how early the meeting was. Did UA like his application form that much? However, he didn't know how to react to the email, whether to be thrilled or regretful that they were interested, Saitama himself was ambiguous as to whether this was the best decision he made.

Saitama put on yellow suit and wore his crimson boots and glove as he prepared himself for the interview in UA High. His heart started to slightly beat faster as he had never succeeded in getting accepted in a job interview before, due to his lack of interest. Am I actually going to get through with this? Saitama thought to himself.

Using his superhuman strength and agility, he tried to remember the address of UA on his computer, but did get lost at some moments. Finally Saitama found the building as he'd memorise what it looked like. The U.A high school was covered all over with windows with four huge towers on each corner of the building.

The school was full of chattering teenagers as the bell as rang. They all were laughing and talking to each other in amazement as they exited the building through the front gates. Saitama walked through the front gates, hoping to avoid being stuck out like a sore thumb, hoping that no one would notice his bald head and start teasing him. As he passed the gates, a young teenage boy with spiky ash blonde hair along with red eyes walked out of the front doors but as soon as he saw Saitama, his attention was centred to him. The boy walked up to Saitama with an intimidating face.

"Hey Baldy, what's your business here? This is a high school, not a wig shop!" The boy shouted at Saitama as he menacingly glared at him.

Saitama, irritated, replied to the boy "I'm here for a job interview."

"Ha, for someone like you, you'll get fired before you're even hired!" The boy scoffed at him.

He walked passed Saitama towards the front gates by himself. Saitama started to feel his blood boiling as the boy aggressively threw insults to him, especially about his bald head. The boy sounded like he had no remorse for what he said as the he was oozing with confidence and arrogance. Saitama eventually decided to ignore him and walked back to his direction towards the front doors of the school. As he turned around, he saw another teenage boy exit the front doors, but with large green fuzzy hair and a with a friendly face. He was running towards the direction the rude boy went.

The green haired kid suddenly stoped and went up to Saitama and said, "I'm really sorry about Kacchan, he's like that to everyone, so I really do apologise for what he said to you!"

The green haired boy then returned to his quick pace towards the direction of the other boy. Saitama saw him as he ran towards the rude boy, Kacchan, who just crudely shouted back at the green haired boy "Back off Deku!". As Saitama saw the two boys walk off, he was starting to doubt his decision of applying to the school if there are students as aggressive and irrational as Kacchan. Due to him being broke however, Saitama really didn't have a choice so he walked to the front doors and entered the building. As he walked in, he saw the hobo-looking man from the news on television, exiting from a door in the hallway carrying a bunch of folders in his arms. The man looked at Saitama as soon as he turned and walked up to him.

"Mind telling me what you're doing here mister?" The man asked.

Saitama looked back at the worn-out man and replied, "I'm here for the job interview, my name's Saitama."

The man replied back to Saitama, in an apathetic tone "So you're the one our principal was expecting, he told all the staff during our meeting that he received an application form from someone. Although I do apologise for the early meeting time, our principle can be… quite eager at moments like this. Other than that, I'm Shota Aizawa."

Aizawa guided Saitama to the principal's office where his interview will be held. Saitama kept staring at Aizawa's looks as his hair was all over the place and not to mention very messy. His baggy dark clothing felt disturbing as Saitama associated Aizawa more as a hobo than a teacher, making Saitama feel even more uncomfortable at UA High. Aizawa turned to his right as he saw Saitama staring at his outfit.

Aizawa felt annoyed as Saitama inconveniently stared at his clothing and said to him,

"Do I look that interesting?"

Saitama faced upwards to Aizawa's pissed off face and asked him "Why are you dressed up like that anyway? Honestly you look more like a hobo."

Well this man certainly speaks before thinking Aizawa thought to himself. He replied back to Saitama "I don't like to appear on the news in the eyes of the general public, it interferes with my duties as a hero."

Saitama felt the exact opposite about Aizawa's opinion. Saitama never really got any attention from the public, nor was he praised for his heroic work in his past for defeating evil quirk users. He would sometimes feel that the world hasn't changed, even if he did become a hero through his own training, he would feel so trivial compared to everyone else. It seems that the popular heroes take most of the credit these days. The two men arrived at the principal's office and Saitama opened the door handle to enter the room.

Saitama entered the room. The room was highly organised with shelves full of books and huge files of information. It was also pretty spacious and comfortable with a huge window on the side of the wall, letting the tranquil orange light of the sky through. It almost seemed like a comfortable home, until Saitama saw a humanoid mouse wearing a suit and tie sitting on the principle's desk drinking tea. He paused for a moment, not believing what he saw at first. His thoughts began to scatter as he became so lost that he could not formulate any words. UA High was said to be the best heroic school in Japan, but Saitama found it hard to believe that the principle was a mouse.

Saitama looked back at Aizawa and asked him "Who's the kid in the mouse costume?"

Aizawa responded in an unenthusiastic tone "That's not a kid, he's the principal and I'd suggest you give him more respect."

As Saitama looked back in confusion at the principal, he walked into the principal's office. Aizawa left and walked back down the hallway. Saitama sat down on the chairs in front of the principal's desk. He awkwardly looked at the humanoid mouse as he was finishing his tea, trying to avoid making any rude comments about his look. The principal looked at Saitama, smiling at him and said to him optimistically,

"I take it that you're Saitama, I'm the Principal of UA High, Nezu! I'd say that you came here earlier than expected! If I'm not mistaken, I sent you that email 30 minutes ago! Anyways, onwards to the question! Why do you want a job here at UA High? We do have quite the reputation for our academic hero courses."

Saitama simply said "Well, I'm kinda broke, so I guess that I kinda need the money." Despite it sounding a bit selfish, Nezu nodded his head, understanding the circumstances that Saitama was in. Nezu asked another question.

"What is your knowledge about the history and origins of quirks? Or the foundation of our superhuman society we live in today?" Saitama was spacing off a bit and replied in confusion "Uhhh… what?". Time went by as the principal asked Saitama numerous questions about why he wanted to apply to UA High.

Principal Nezu then asked Saitama what his quirk was. Saitama wasn't born with a quirk, but he knew how to answer a question like that. "Well I was technically born quirkless, but I did 3 years of intense training, driven by my desire to become a hero, and I became really strong. I think that could count as a quirk. If you'd like I could show you" Nezu however did not believe that strength training to be an adequate quirk and politely refused his demonstration. He started to think for a while if Saitama should really be hired into UA High, due to the many requirements he was lacking. Nezu however sympathised for Saitama as he knew the situation he was in and that UA High was the only way for him to get back on his feet. Nezu finally reached his conclusion.

He got off his chair and walked in front of Saitama and looked up at him smiling. "Good news Saitama, you're in!"

Saitama felt delighted as he felt proud of himself for getting into his first job ever in his life. He however knew that it was going to be a difficult path to work at a school with such a high reputation, and also having to endure the ridiculous people that he will have to meet every day.

Principal Nezu then proudly said to Saitama "From now on, you'll tasked as UA High's Janitor!"

Suddenly, as Saitama heard those words, he got shocked to the core "I'm the… what?!"

As soon as Saitama realised the reality he was in, that difficult path suddenly turned into hell.

TO BE CONTINUED