A/N-This is a romance story between Saitama and Tatsumaki, this chapter is only about Saitama as a little introduction. This is my first FanFic I ever wrote and I'm not a native English speaker so forgive some mistakes. Of course, critic on every topic is appreciated. This story has a different Saitama as we see in the anime or manga, at least a bit. I stay true to his struggle to find meaning in his life after he gets so strong, but I will make Saitama more aware of his powers. Saitama doesn't put up with anything in this story. See it as a more bad ass version of Saitama. I know, he is a bad ass already, but I think I can put it even higher. So, thanks for everyone reading this, I hope some people can enjoy. Before I forget, the story line will follow the manga but there will be OC.

Saitama gets serious

Chapter 1

Too strong

It's been 3 years since I started my training, 2 years since I felt a change in me, 1 year since I became the strongest. Am I the strongest? Maybe I am. I mean, there was nothing in the last year, that was even slightly a challenge for me. Hell, my skin is so resistant, a tank could hit me, and I wouldn't feel a think. But at the same time, my senses are stronger than ever. I feel every hint of wind on my skin. Every touch is intensified. I even have super reflexes or something. Like, when a monster tries to attack me, I see in an instant their attack. Sometimes I don't even bother to dodge attacks and all the time I do it's because I am worried about my hero costume because that's all they can damage. But even that happens less and less.

My god, I am so fucking bored.

"This is an emergency evacuation notice. An unknown monster has appeared in A-city. Estimated disaster level demon. Citizens of A-city, please evacuate immediately."

"Here I go."

A purple monster stands in a large crater in A-city. Its muscular human form, its two inhuman antennas on its head makes him an eye catcher. It jumps in the air and throws huge energy balls on the city. Skyscrapers crumble under the enormous power of its attacks. Houses get demolished and a lot of people lose their lives. It stands in the center of his destruction. It is seemingly impressed of its performance.

"Waaah! Mommy, Daddy, Waaah!" "Huh?" the monster emits. In the ruins of A-city stands a sobbing little girl. Her long hair is tied to two ponytails, her shirt bears the inscription "SCHOOL CHILD". The tears streaming down her face. The monsters hand gets ready to crush the girl. The hand becomes more muscular, the claws longer and tiny little spikes are on its surface now. But before it can squash the girl she's not there anymore. It looks behind it. The girl lies on the floor but not alone. In front of her stands a man, in a laughable hero costume. He even has a cape. Ridiculous.

"Who are you?" asks the monster.

"Someone who is a hero for fun," says the bald man in front of him. His face completely expressionless and his body screams average.

"What kind of ridiculous backstory is this?" it says mockingly. "I exist because of humankind's constant pollution of the environment!" the rage in its voice now clearly noticeable. "I am VACCINE MAN!"

It rages on, "the earth is a single living organism! And you humans are the disease-causing germs killing it!"

Vaccine man starts to yell at the bald hero before him. "The will of the earth gave birth to me, so that I may destroy humanity and their insidious civilization!" It's getting bigger, its muscles grow, the claws and teeth becoming longer, and spikes grow all over its body. In this form it looks more animal than before.

"But you do this for fun?! That's the reason you opp…".

"Please shut the fuck up! All you monsters can't stop talking." Did it just hear that right? Did this insignificant little worm just silence him? This idiot must have a death wish. It rushes forward in an insane speed, its large muzzle wide open, showing its tremendous teeth.

"DIE YOU LITTLE FUCKER!", Vaccine man shouts, completely enraged. It will kill him for his insolence.

But it doesn't even manage to touch him before its inevitable end. A slight pain and everything goes dark for Vaccine man.

The caped man stands in front of it. The upper part of Vaccine man completely gone. Its guts scattered over the floor. The hero keeps his expressionless face up for a moment. He looks on his fist. Light smoke rises from it. "I didn't touch the monster and it dies anyway? My god, it was just the fucking air pressure!" the man thinks to himself. "What did I expect?" His face becomes angry as he falls to his knees. His hands on the side of its head as he screams to the sky. "Finished in one punch again! DAAAAMN IT!"

As he gets his composure back, he stands up and puts his bored face on, a slight hind of sadness recognizable. As he turns, he sees the girl from before sitting on the ground. He forgot about her during the one-sided fight. She looks at him, her eyes red from crying, but most of the tears have already dried. Her eyes are full of grief and sorrow, but there is more, he sees wonder and appreciation and most of all curiosity.

As he walks by the little girl, she starts to speak, "Mister, t-thank you for saving me," her voice is low and dry.

"Yeah, you're welcome" he doesn't look to her when he says it.

"What's your name?" she asks perplexed, she doesn't understand why this man is so calm and unaffected by all of this.

"My name is Saitama," not one bit of emotion in his voice. "Sorry kid but I go now, I'm done here"

As he keeps walking, he hears her voice once more rising, "wait, please!" She stands up. What could she say to him? He is her savior after all. After a brief moment she remembers his outcry after he killed Vaccine man. How can someone like him be upset over this epic win? She asks him the only question who comes in her mind. "Mister…, Mister Saitama, are you ok?"

Saitama is confused, she probably lost her entire family 5 minutes ago, but she asks him if he is all right? Maybe it is the shock or something.

Saitama turns his head half to her; one side of his face looks to her now. With a serious expression, he opens his mouth. "No kid, but thanks for asking." With this he goes his way. His cape whips in the wind. She looks after him full of amazement.

In the distance sirens of the police and fire department can be heard.