Summary: Aoba Kiseki was five when his hair turned blue, his eyes gleamed gold, and a voice started speaking in his head.
(Or, Rimuru Tempest gets isekai'ed a second time, this time in a land filled with Quirks and flashy heroes. At least he's not alone this time around)
Warnings: Isekai, Temporary Off-scree Character Death, Grey Morals, Canon Typical Violence, Gen, Profanity, Quirk Discrimination, Quirkless Discrimination, etc.
Disclaimer: I don't own BNHA or Tensura, I only own my ideas.
.
Aoba Kiseki was a miracle child.
Born seven months early and so, so very small, the doctors weren't confident with his chances of staying alive through the night, and his parents were crushed.
Then morning came, and he was still breathing in his incubator. Another three more days, and his breaths were becoming more stable. A week, and the doctors were praising his survival as a miracle.
Miracle. Kiseki.
That was his name. Aoba Junpei and Aoba Mei's little miracle.
He's a rather bright child, easily keeping up with his peers and more. He liked storybooks with colorful pictures best, and would always drag his mother around to show her what next new thing he found.
Aoba Kiseki was five when he received his Quirk, in the middle of class during Japanese History. It started with him falling asleep on his desk, snoring quietly and away from this world. The his hair turned from black to a silvery-blue, and that was when a classmate of his alerted the teacher about the strangeness happening to him.
"It's alright, Keiko-chan," the teacher had reassured her, all calm smiles and even tones. "Kiseki-kun is just undergoing the changes his Quirk is affecting him."
Unbeknownst to anyone else, Aoba Kiseki wasn't quite sleeping at all.
[Notice: Analyzing host's body and memory reserves… Previous memory detected. Incompatible body detected. Undergoing reboot…]
Aoba Kiseki's body started to melt, sweat turning translucent blue. His arms drooped, and his body became smaller. The teacher ushered the other students out to give him privacy, and stayed with him to watch over the slumbering boy.
[Notice: Reboot 50% complete… 60%... 70%... 85%...]
His teacher watched in awe as his body transformed into a small, round slime, clothes falling to the ground.
[… 90%... 100%. Reboot complete. Jumpstarting previous memories…]
The slime 'blinked', waking up to awareness. Instinctively, he spreads out his awareness, using [Magic Sense], and was confused at the amount of magicules around him.
[Notice: Unlocking previous Skills and Connections]
What the…? Shaking his head, the newly-awakened slime jumped on top of his table, making his teacher approach him seeing that he was conscious.
"Hello, Kiseki-kun. How are you feeling?"
Who is this person? And why is she call me 'Kiseki'?
[Notice: She seems to be your Japanese History teacher, Kurosawa Hanako]
Ciel? What are you doing back in my head? Rimuru asked, outwardly staring at his apparent teacher in silence. The teacher—Kurosawa—looked at him in worry. "Kiseki-kun? Can you understand me in this form?"
[Notice: I seemed to have reverted back to my form as Raphael due to our connection during your reincarnation]
Reincarnation!? A '!?' formed on the slime's head, surprising Kurosawa. She tilted her head. "Can you understand me after all, Kiseki-kun?"
Oi, oi, oi! I don't remember dying! What do you mean by 'reincarnation', Ciel!?
[Notice: Reincarnation, a state of being born again after death—]
That's not what I meant and you know it!
[…]
Ciel! Do you know what happened? How did I get reincarnated? Again!?
Ignoring his teacher, Rimuru jumped down from the table and out into the window, causing Kurosawa to shriek. Landing on a nearby branch, the slime hopped from window to window until he was at the rooftop, all alone and free to yell out in panic.
"Ciel! Did I die again? How could I die!? I'm nigh indestructible! And how did the enemy bypass Benimaru and Diablo and the others!?"
[Notice: …you seemed to have had accidentally killed yourself]
"WHAT THE HECK DOES THAT MEAN!?"
Aoba Kiseki was five when his hair turned blue, his eyes gleamed gold, and a voice started speaking in his head. He was also five when Rimuru Tempest, Demon Lord and Ruler of the Jura Tempest Federation, woke up, wrong-footed and more than a little befuddled by present events.
[…insufficient information]
"DON'T MAKE EXCUSES!"
.
"Your son seems to have a mutant Quirk that allows him to take the form of a slime."
How did it get to this? Rimuru lamented mentally, eyes on his lap while he's seated in between his new parents. One moment, I had it all. The next, I'm back to being five and in a world crazier than the one I was in.
[Notice: This world is not crazier than the previous one. There are no monsters and—]
Ciel… please shut up. I'm having a crisis here. I'm sorry.
[…understood]
Sighing, Rimuru glanced at his parents from underneath his bangs. His father, Aoba Junpei, was a soft-looking man with kind, hazel eyes and black hair. His ears were pointed from a leftover mutation gene from his mother, and his Quirk was the ability to produce sticky liquid. His mother, Aoba Mei, on the other hand, was a purple-haired beauty with a mole underneath her right eye and gold eyes. Below her waist is a body of a snake, and her Quirk's name is Naga, like the mythological beings and one of the Beastketeers that married Benimaru.
From his former memories, he could confidently say that they were good parents and wanted the best for their son. His father worked as a construction worker, and his mother worked from home as a blogger. Their family was comfortably middle-class: not too poor, but not too rich either.
After the check-up with the doctor was done, Rimuru went home with his parents and ran straight to his room. It was a simple one, if a bit cluttered with toys on one corner. Baby blue walls and white, carpeted floor. There was a bookshelf filled with books and action figures of heroes he could scarcely recognize as All Might and Best Jeanist, alongside Present Mic and Gang Orca. Near the window was his bed, an All Might plushie on it, and a toy box on the side.
Lying face-first on his bed, he let out a groan.
Ciel… are all my Skills still there?
[Affirmative. Would you like to test it out?]
No, maybe later. I think I remember something about not being allowed to use Quirks unless it's a life-or-death situation and for self-defense. Anything else?
[Notice: Connection with Storm Dragon Veldora is still present]
Rimuru abruptly sat up. "What? What do you mean my connection with Veldora is still present?"
[Notice: Skill "Dragon Storm" Veldora has a sub-skill in which memories of Veldora is kept within your magicules in case of Veldora's death and subsequent reincarnation. Would you like to use this Skill?]
[Yes] [No]
Shaken, Rimuru muttered a, "Yes," that broke in the end.
Automatically, the skill [Clone] is used, bringing an identical Rimuru out who was looking flatly at its original. Suddenly, a bright light enveloped the clone, and Rimuru watched with bated breath as the doppleganger slowly shifted to accommodate the memories and magicules it was being given by Ciel.
His hair grew shorter, and his frame slightly filled out. His simple shirt and shorts combo turned into a sleevless black top and off-white knee-length pants decorated with pockets. Smaller versions of familiar boots replaced his sneakers, and pale skin turned tanned.
The light soon died out, and Rimuru's eyes watered at the sight of his brother in all but blood.
"Veldora…"
Sharp, reptilian eyes fluttered open, making the markings on his face stand out, and a toothy grin bloomed in his face.
"Yo, Rimuru!"
.
After hugging the life out of the dragon, who guffawed before returning the embrace twice as tight, Veldora was updated about their situation as they seated on Rimuru's bed.
"Hmmm…" Veldora hummed, fingers on his chin. "You know what? This reminds me of a manga I read. It was about a guy being transported to another world! And then he got framed by the evil princess, so he went and got himself a slave because he trusted nobody but himself."
"Veldora… focus, okay? We need to figure out how to explain your appearance. It helps that you look around my age, but that still doesn't give you an automatic pass."
Veldora frowned. "Can't you just say your Quirk brought me here?"
"No," Rimuru shook his head. "As far as my parents know, my Quirk lets me turn into a slime."
"Isn't it the other way around?"
"Well, yeah. But they don't know that."
Silence persisted for a few minutes, before Ciel spoke up.
[Notice: You could explain Veldora's appearance by his Quirk malfunctioning]
A lightbulb turned on.
"I see! We could say that Veldora's Quirk brought him to my room! As expected of Ciel!" The two shared twin grins, exchanging a high-five at the plan.
"But what would my Quirk be?"
Rimuru closed his eyes in thought. "Hmmm… obviously, we should go with you bring a dragon, but dragons can't teleport…"
"They can fly though."
"Yeah, but how would that explain your arrival when nothing's…" they turned to the window in his room. "…broken."
And thus, that was how Ryuujin Arashi crashed into Aoba Kiseki's bedroom window, and became best friends for life.
.
Veldora, Rimuru explained, was an orphan who ran away from the civil workers. He didn't like the way he was moved from house to house, and that was how he ended up crashing into Rimuru's bedroom window.
His mother, golden bleeding heart that she was, offered to adopt 'Arashi' on the spot. And after talking it out with her husband, he agreed.
Veldora was beside himself with glee at becoming Rimuru's brother once again, though he kept his 'last name' as a tribute to his Quirk, and after a week of proceedings and paperwork, the Aoba Family had another member under it's family register.
.
It was during his sixth birthday party when Rimuru met his cousin.
Veldora was tasked with 'distracting' Rimuru so he wouldn't find out about the surprise birthday party his parents had planned. Playing along, Rimuru pretended to look dejected when nobody greeted him happy birthday and allowed Veldora to drag him into the nearby park so they could play.
It took about two hours of playing tag, hide-and-seek (with both agreeing to not use [Magic Sense] to make the game more interesting), hopskotch and mimicking monkeys on the trees before Junpei picked them up.
Upon entering the living room, party poppers went off and the lights turned on as everyone yelled, "Surprise!" Including Veldora who screamed right at his ear. Ow.
"So you didn't forget my birthday!" Rimuru gasped, hugging his mother. Mei chuckled, kissing his forehead. "Of course not, my little gift. Come, meet your cousins and aunts!"
His aunts, Ashido Shoko; a plump lady with deep green eyes and a pink bob cut, and Ashido Ruka; a lilac-skinned woman with black sclera and red eyes, indigo hair around her waist, were visiting for the first time since his second birthday. Shoko could produce a clear liquid that would soon turn solid if left unattended for five minutes, and Ruka was able to turn her arms into tenatcle-like tendrils she could move individually.
His cousin, one Ashido Mina, was a hyperactive ball of energy that could secrete acid.
With skin the same color as her pink hair from her mother, and sclera the same black as her mom's, Mina was a force of nature that swept Rimuru into a hug before twirling him around and crushing his ribs.
"Happy, happy birthday, 'cuz! I'm sooo happy I got to see you again! Well, we were both two when we met, so I can't really remember what happened, but we meet again now! And, wow, your hair's so pretty—"
"Mina, let your cousin go. You're crushing him."
"Oh!" Mina dropped her hold on him, letting his breath sweet, sweet air. Veldora laughed from where he's at behind his left, and Rimuru gave him a half-hearted glare. Mina grinned. "Sorry about that!"
"It's fine," Rimuru inclined his head. "It's nice to meet you too."
"I'm Arashi!" Veldora jumped in, holding out a hand for her to shake. "Rimu—Kiseki's older brother!"
"Ohhhh another cousin? Yes!" Mina gave him a hug as well, and Veldora laughed as he's spun around. Rimuru could already feel himself get tired just by looking at them.
Unbidden, a smile creeped its way to his face. Life might be crazier now, but it was still good.
Veldora let out a loud burst of laughter, and Mina giggled. From the side, the parents looked at them in fond exasperation.
Yeah, still good.
