He was the eighth son of the seventh son of the seventh son. His elder brother who was the seventh son of the seventh son of the seventh son was the favored one. He was the one with all the magic and powers and bond with Destiny.
His other older brothers were all jealous of the seventh one because he was the one who would find the princesses, fight the demons, and win a kingdom. Saitama knew the trouble with jealousy was that it would ultimately lead to fighting among the brothers. Because of that, there were frequent battles for honor in his father's household. Saitama himself had to learn self-defense and learn to fight because his brothers would start a brawl that would lead to the entire family duking it out on the clear space beside their home. It was tiresome.
Saitama wasn't sure why his parents continued to procreate after the seventh son was born. He thought of asking but there would not be any other answer but thus; they forgot to use the charms against child birth one day, leading to an unwanted eighth child. Saitama therefore, was often isolated, secluded, and dismissed by his family. He didn't quite matter, as the seventh son was the important one. His other six brothers would fight for attention as well. He found it exhausting and thus, allowed time to pass and to let him be known as the passive, near invisible youngest brother.
In stories, legends, he would probably be the one eaten by monsters first. The one that would cry out a warning to the rest and allow the hero to fight the monsters while he bled to his death.
Saitama also knew from a young age that he wasn't going to be that person. He was lucky that he wasn't bound to one path like his legendary seventh brother. He wasn't a fool like his older six brothers to fight for that position either. Saitama would find another way, he would live the way he wanted. He would become a hero.. And it wouldn't be destiny telling him to do it. It would be his hobby.
He trained so hard to become worthy to be a hero that he had all his hair fall out. Seventh brother still had his luscious black locks despite being strong. All his other brothers laughed at him. That didn't stop Saitama from working even harder. He dreamt of adventures, he dreamt of traveling foreign lands. All his elder brothers were waiting for fate, for destiny to guide them. Saitama would forge his own path.
He started to scour the lands for stories for ancient tales of dragons and monsters beyond imagining. Saitama would start his adventure in a place of his choosing. He wouldn't wait for it to come to him like what seventh brother was doing. Saitama searches for stories that teetered between reality and legends. He searches for the darkest parts of myths that tell of bloodshed and horror. He finds stories of man turned monster, seeking revenge. He dreams of a land where darkness hides a Prince or Princess so beautiful.
Sometimes there are stories of princesses hidden away, waiting for the right person to wake them. In this story, there is a demon, waiting for the right person to wake them up. No one tries. It's a demon, and fear surrounds them when they think of that word. No one wants a demon to be bound to them.
No one except Saitama.
Saitama leaves after getting nods of acknowledgement from his parents. They aren't the same as his seventh brother getting their blessings, but it'll do. Blessings have power, but Saitama doesn't need power. He has his strength.
He wanders about, fighting monsters and demons. It was exhilarating at first, but it gradually became too easy. Saitama gets a bit of a reputation. He ends up at a castle and becomes a knight to a young King. He helps defeat their enemies, and he's given land and a title. He does have a good life, despite not being popular.
Saitama doesn't get any popular. People seem to think that he's a cheat. They think that he's relying on his many brothers to win battles just because his family is known for magic. It's ridiculous but Saitama doesn't care. He's.. Content. And bored. So bored.
Despite fighting monsters, Saitama has come to a realization. There are worst monsters than the ones he sees, the ugliest ones lie in the hearts of people. He's seen too much by now, and Saitama's tired. Hobbying as a hero does not seem to be as fun as he thought it would be.
He remembers a tale as old as time, of a man turned monster. A man turned into a demon. And Saitama says, "It is time to find him." It is not Destiny that beckons, but want. He wants.
Saitama hums, he takes his sword and scabbard, keeping it close. He goes to King, and he tells him that he must leave. King weeps, as he's losing his trusted knight. Saitama will not stay, he wants to walk the ends of the earth. He wants to leave contentment, and feel again. King lets him go. There is never a way to keep hold of a person that has flight in their hearts, there's never a way to keep close someone whose eyes are on the skies.
Saitama walks and he slays dragons in his way. There is blood in the path he takes. He doesn't care. As he gets closer to the land that was razed by fire so very long ago, Saitama notes that the darkness that permeates the place doesn't go away.
There is no light here. The moon doesn't shine over the land. Even the monsters dare not enter. It is forsaken, it is wrong. His mind tell him to continue, that there is nothing to fear, yet his hammering heart, and shaking limbs tell him otherwise.
Onward, onward he goes.
The darkness it creeps.
The horrors that come.
You hide not from it.
You cannot run.
Saitama starts to sing. Rain starts to pour down, and he didn't notice because it was dark, but as he continues, Saitama notices that the rain that pours is a downpour of blood. Slick, warm red blood trickles down his face and hands. The curse upon this land is strong. There are too many deaths and they are screaming to be avenged.
Saitama can almost hear the whispers.
Help us. Save us. Kill him.
Saitama clenches his scabbard harder. He will not succumb to despair. He walks on, ignoring the ghostly presence around him. The blood continues to flow, and each time he takes a step, his boots squelches in agony. In his other hand he holds a Talisman that his friend Fubuki had given him. Her powers as a Witch is unparalleled, and he knows he will be protected by her charms.
When he finally enters the ruined castle, he finds that all traces of blood on him are gone. He is dry, and well. Saitama lets out a sigh, and he makes his way through fallen debris, skeletons, and the smell of rotting food. There are scorch marks everywhere and he wonders if it was the demon that had caused it to happen.
Onward, onward he goes.
There are many rooms in this forsaken castle, and Saitama walks past each room. He may not have a lot of magical powers like that of his six older brothers, but he knows enough to trust his instincts. He stops in front of a room with a decrepit door. There is nothing to say that this door is anymore special than the ones before or the next, but Saitama knows that within lies the one he wants.
He enters the room, and he is faced with a small creature with wings that is barely the size of his palm. A fairy! Fairies have been extinct for a long time.
The fairy has a mushroom cap-like hair, and he floats around.
"Are you here to release the Demon Prince?" the fairy asks.
"Yes," Saitama says with surety in his voice. "Please tell me how."
The fairy smiles, "Do you not read tales of how Princesses and Princes are saved?"
Saitama frowns. True Love's kiss is the only way to release a curse upon royalty. He blushes. How can one love when one has only met? He does not believe it to be possible.
"Kuseno is never wrong," the fairy says kindly. "Upon which you lay the kiss, he shall be yours eternally."
Saitama sighs. He had thought of claiming the demon for himself for a long time. He just didn't think there would be a different aspect of claiming.
"An unbreakable bond?" he says aloud. He would be stronger, that much is true. Saitama however, valued his solitary lifestyle. He sighed again.
He walks to the bed where the Demon Prince lay, and his breath catches in his throat. The Demon Prince is beautiful. There are horns on top his head as per usual of a demon. His horns curve out from blonde locks. His face has marks like that of a tiger. Even in sleep, the Demon Prince is regal and poised. Saitama wonders if this is how love feels. To fall in love at first sight.
The thought of being bound to the Demon Prince is no longer in question. He press forwards, and he kisses the Demon Prince.
It is a chaste kiss, for he doesn't see how the Demon Prince can reciprocate. He waits. Saitama feels a burning sensation on his hand, and he lifts his right hand to see that a mark has formed. It is the same crest that he has seen while he walked through the hallways to find his Prince. It is the crest of the fallen kingdom, and Saitama supposes that it is the bond between him and the Demon Prince.
The Demon Prince's hand twitches, and Saitama sees the same crest on his right hand, identical to his own mark. The Demon Prince's eyes open and it is a blazing ember, against black.
"Wake up Demon Prince," he says, and excitement is rushing through him, a fissure running down his spine. "We have to go save the world!"