This is just a work of fiction
I don't own characters of both seriesOne Punch Man owned by ONE
Mahouka Koukou no Rettousei owned by Tsutomi Sato
City S
"mouu, onii-chan. Wake uuuuup!" saida girl with auburn hair. "Ten minutes more, then i'll wake up, Saiko" answered the boy
"mouuu, Ryuu-nii chan. I'll tell Setsuna that you hate me, if you don't wake up" said Saiko. "Fine, i'll wake up. O' little sister of mine" said tras-i mean- Ryuu
tok tok'
the sound of someone knocking the door, "haii, Saiko, could welcome our guest?" said Ryuu
"hmmm... Fine"said Saiko
When Saiko opens the door, she was surprised. It was Charenzia, the one who made the Darkstone and fuse it with the Dark Emperor Ultimate Dragon of Destruction inside her oniichan
"for what reason do you come, Dark Mistress?" said Saiko
" ara, am i not welcome to visit darling, Yellow Princess-chan?" said Charenzia
Saiko can only glare at the big-busted blonde in front of her
"Fine, come in and sit, don't do anything funny" threatened Saiko
Charen walks in and sit in peace until her red orbs met the grey orbs of Setsuna, the self-proclaimed gf of Ryuu. " hoo, a little darkness trying to steal my man, are you asking for a fight, plastic bust?" said Setsuna
Before Charen could attack, Ryuu manages to butts in out of nowhere and calmed them down
"Darling" said Charen, clinging to his right arm
"Honey" said Setsuna, clinging to left
"Oniichan" said Saiko, hugging him from the front
"Husband", "Master" said Mizuko and Nizuko while clinging on his back
IT IS THE REUNION OF HEROES OF BLACK BALLAD
Suddenly, their house explode. They are attacked by a black naked bald figure in the sky " I am god, i am bored, you guys are dead"
Ryuu and friends, feeling great power from the god, decided to use their strongest attacks
"Ultimate Darkness Dragon Force, Noroex" shouted Ryuu
"Ultimate Seal of Destruction, Beetariaz" shouted Setsuna
"Fatal End: Mixed Ver." shouted Mizuko and Nizuko
"Crazy Blast: Pure Beam" shouted Charen
All of their attacks hit the god at point blank, creating a huge mega boom that causes the city to trembles, a huge cloud can be seen from the city Z
Then, a huge wind disperse the cloud, showing god without a scratch
"Impos-" before Ryuu can finish that, he is punched so hard in the face, so hard that his head exploded, sending brain matters and blood to his harem, they are speechless, until all three girls got their upper body part disintegrated by a powerfull beam from god
"Pathetic, weaklings always talk too much"
said god
Then, Saitama suddenly arrives and punched god so hard that he was disintegrated, creating an instability in the Law of The Universe 'cause a god just died, creating a mini black hole, just right above the destroyed house, attracting everything in 100km, except Saitama
but his coupon got attracted
"Ahhh.. Oh no... My coupon!!" said Saitama
Then he jump in to the black hole
"What the..." in front of him is void, endless void
"What the hell happened to my coupon? damn it, if i put it in my pocket, this will not happen" said Saitama, filled with regret. Then, he remembered that regret won't bring it back, now, he needs get out of here (more like get in rather than get out in my opinion)
So Saitama being the simpleton he is decided to punch his way, the punch was so strong that it causes a portal to another universe
"It works, that must be the way out"
So Saitama gets in to the MKnR universe
And the next thing he knows is he is surrounded by unknown buildings, crowd talking weird language, and he somehow understand it
"ah tu lampu taman, bikin apa situ?" said civilian A
"pantesan aja panas, tu kepala kayak microwave tenaga surya " said civilian B
Some kids are protecting their eyes from possible UV lights
"tu anak urat malunya ada nggak?"said civilian C
"orang tuanya pasti nggak ngajarin baik-baik, masih muda, botak, hidup lagi. Dasar ortu nggak tanggung jawab" said civilian D
"tu kayaknya stress de, mungkin mantan pasien RSJ"said civilian E
Saitama starting to feel annoyed, these people don't even know him, yet their already insult him even judge his parents as if they know them, he haven't even done a single thing, although they are right about the stress thing
"hey, kid, where you from?"asked civilian E
'now they talk in my language' thought Saitama
"city Z, and you can speak my language?" asked Saitama
" city Z?? never heard of it and pretty sure it doesn't exist anywhere in this world, well maybe in another world, that theory is pretty cool, no, not pretty cool, it's really cool, there could be a world filled with horny milfs or a world filled with desperate alien that in need of some super milk..." mumbling civilian E
"umm... sir..."
"oh... right, sorry, i'm pretty hyped when it comes to multiverse theory and for your question, no, i speak my own language, how did you learn my language, anyway?" asked civilian E
"huh?? you're the one who speak my language!"
"what?? why woul-wait, can you speak slowly?" asked civ E, and Saitama reply
"oookaayy, whyyyy diiiiid yooouuu aaassskk-" "that's enough, i get it now, your lips doesn't follow my language" cuts in civ E
"you're right, yours as well, it doesn't follow my language" said Saitama
"hmmm... i think it's a language spell, either someone cast it on you or you cast it yourself" said civ E
"spell?? you mean magic?" asked Saitama
"well yeah, don't you know? everyone know it, it's basic knowledge, with those CAD, we can do many things, including braiwashed, wait wait... kid, did you get brainwashed?" asked civ E
'magic!? is this another world that this guy said before? damn it, if i put it in my pocket, all of this wouldn't happened' thought Saitama
"i... think i am, i don't remember how i got here" answered Saitama
"what a poor child, here, i'll bring you to the police station, maybe we could find something about you" offered civ E
"thank you, kind sir" said Saitama
"it's okay, and call me mr.Natasha"said the now named Natasha
"okay, mr. Natasha?" asked Saitama, 'it sounds like female name' thought him
"ohhh... the fault is on my mom , she thought i'm a girl 'cause my pp is so small" said mr.Natasha
"so, you have it small?" asked Saitama
"well, as long as it can last long, pack lots of high quality punch, then i'm okay with it" said.mr. Natasha
"oookay, let's just walk to the station" said Saitama
"yup, but damn, you need see them in action, kid, you can get a lot of experience from me" said mr.Natasha
Saitama can only give him a blank stare and walk, pretending he never heard it
When he is walking, he realize something, he got smaller, he looked at his own reflection at one of a buildings window, his bald head is there, he still have that muscles, but he looks younger
That is when he realizes that this is going to be his second puberty at the age of 12, but mental age of 25
Somewhere in Japan
A young girl and a young boy is seen talking to each other, the young girl seems to be happy at the presence of the boy and the boy seems to be protecting her