"Eri's power... it's beyond comprehension. The ability to rewind time itself, to undo any injury, any damage inflicted upon us. It's not just great, it's divine. With her by my side, nothing can stand in our way. Her power is the key to reshaping the world according to my vision."

—Overhaul.

Chapter 2

All Might dashed through the bustling streets of Mustafu City, urgency pounding in his veins.

It wasn't a villain causing the commotion this time though.

An anonymous call had set off the alarm half an hour ago. At first, he shrugged it off, thinking it was just a stalking-type fan. But the persistent caller refused to give up, ringing him four times in a row.

Then came the text message, cryptic yet chilling with just two letters with an address:

OFA

AFO

These were secrets known to only a select few. He feared his most sensitive secrets were in danger. If that happens…

So, with determination etched on his face, the number one hero raced through the city, determined to unravel the mystery behind the ominous message.

After a few minutes of sprinting, he arrived at the beach. Once a picturesque spot, it now lay littered with trash and debris, the complete opposite to its former beauty. Instead of being a place of serenity, it had become nothing more than a dumping ground for people's unwanted belongings.

As he surveyed the scene, his eyes fell upon two figures standing beside a battered car. With a swift, determined stride, he approached them, his senses on high alert.

His mind raced through the possibilities: an ambush, a confrontation with a soldier, a super soldier, a cop, a detective, a fellow pro hero.

However, what he did not expect was two ladies.

The older woman was dressed in a baggy sweatshirt and jeans that appeared too large for her slender frame.

Beside her stood the a girl, clad in loose pajamas and an oversized All Might-themed t-shirt that engulfed her small figure. Despite her youthful appearance, there was a determined look in her eyes, a depth of understanding that belied her age.

Did the woman call him here? How does she know about One For All and All For One? What does she want?

He gave her a threatening look, she may be a woman but he will show her no mercy if she is involved in any evil scheme.

"It's really All Might!" The older one exclaims with wide eyes, completely ignoring the dangerous look on his face. She stretches out her right hand for a handshake. "I-I am I-Inko Midoriya and this is my son…eh…daughter Izuku Midoriya. She is a huge fan of yours! I can't believe you are standing right in front of me! To be honest you look much more intimidating in person than you usually look in the photos or in the TV. When Izuku said that she had your number, I almost didn't believe her—"

"I told you mom that I actually knew the phone number of All Might." Izuku, the little girl said. "He was the one who gave it to me after all."

Wait, mom? Isn't she a bit too young to be a mother of a child of five or six years old? Must have had her when she was sixteen or seventeen. And when did he give her his number? He cannot recall it. But that is not important right now, the important thing is…

"Did you send me the message?" He asks her calmly.

"About your quirk and your nemesis?" He nodded. "I did, sir."

"How do you know about All For One and One For All?" There was no time for beating around the bush. "Tell me how you got my number and know about these things."

He was expecting the older one to answer. However he became genuinely curious when she looked at the younger girl.

The little girl who was not older than five or six was shaking. If it was any other time, All Might would have guessed that she was trembling with excitement due to meeting him but he knew that it was something else.

Is All For One still alive? Did she escape from his grip?

"I am from the future," The little girl replied.

What.

Wait…

"This is not funny," All Might scolded.

"But it is the truth!" She retorted.

He looked at the older woman for an explanation but she shrugged.

"He…eh…she claims to be, it sounds unbelievable, but… she de-aged me twenty years this morning." All Might give her a flat look. "Yeah, I am actually forty years old…but now…I am probably twenty or so."

He blinked before looking at Izuku.

"I-I… w-wasn't exactly who I am now e-either." She said with a stutter, a look of nervousness on her face.

"I don't believe you."

The little girl in her face had a firm look of determination. He knows that look. After all, he looks at it in the mirror everyday.

Toshinori sighed before rubbing his temple. "A few years ago a boy came and told me that he was my son."

"Really?" The older female exclaimed. "You have a son?"

"No! Of course not! Turns out he was just…" He then sighed as his body began to release smoke. The woman flinched as she took a step back. The little girl on the other hand looked completely calm as if she is used to seeing this.

"This is All Might's real form," Izuku explains to her mother. "A few years ago he fought a dangerous villain named All For One who gave him a huge scar on his torso; he doesn't have a stomach. Now he can maintain his muscular form only for a few hours per day." The woman looked slightly reassured.

Okay. Now that's too much.

"You are not joking?" Toshinori frowned while the older female bit her lip. "How do you know about One For All and All For One?"

"I know about One For All because I am your successor in the future," the girl continued. "You gave me One For All before the entrance exam of UA."

"You mean the next entrance exam in eleven months?"

"...yeah…"

"How old are you again, young lady?"

"...fifteen. And I was a boy not even twelve hours ago. I was fighting a supervillain and an accident sent me here in the body of a little girl I was trying to save."

"You are still not joking…"

"...no…"

All Might sighed. "Listen kid," the little girl looked at him. "You are serious, aren't you?" She nodded. "Okay then, how about you give me a nice little proof?"

She nodded.

"You claim that you have One For All, right? So how about you show me a little move? If it is really One For All, then it should resonate with mine. Thus I can understand if you are saying the truth or not."

She hesitated for a moment before nodding. She took a classic All Might stance for Detroit Smash. "S-stand back, please,"

Her mother and All Might backed off a few metres before she said, "Not enough! Stand back!"

All Might's frown deepened. and her mother followed her instructions and took shelter behind a pile of cars.

The little girl faced the ocean. She took a deep breath before focusing.

All Might and the young mother looked at the little girl with wide eyes, thier expressions full of fascination as power channelled through her body, green light emitting from her small form and her hair shining a bright green and floating above like a mystical tree.

The little girl took an assault stance before shouting, "One… Rewind For All: Full Cowling: Detroit Smash…!"

For a heartbeat, there was silence. All Might's gaze flickered with uncertainty, wondering if perhaps it was too much to ask of the young girl. But then, in a burst of raw power, the ocean trembled.

In an instant, the water split apart, like the parting of a great curtain, revealing the raw force within. The shockwave rippled outwards, tearing through the air with a deafening roar. Trash and debris were caught in its fury, swirling around them like leaves in a tempest.

Inko had fallen unconscious due to the shockwave after throwing up a bit.

All Might could only watch in awe as the sheer magnitude of Izuku's strength became clear as she constantly destroyed her cells before reviving them. It was a sight to behold, a testament to the unyielding spirit of a hero. And as the echoes of her power faded into the distance, he knew that he had witnessed something truly extraordinary.

"What a power… Rewind For All. Huh? Extraordinary."

He took the woman on his back and came to the young girl.

the girl look at her mother with concern before All Might said, "She is just unconscious." Izuku nodded.

"Do you believe me now?"

"Time travel, huh? That's new. Not impossible." He said. "I believe you." She was relieved before she frowned. God, that is extremely hazardously adorable— All Might barely controls himself from pinching her cheeks and letting out an 'Awww…!'.

"So what is going to happen now?"

"We shall pass this… transformation as a result of late quirk emergence." All Might explained. "then you will need a change of… wardrobe and a few more things."

"Oh crap… I am now Eri…! No. No. No…This is like a bad movie reboot, except I'm the star!" Izuku muttered almost incoherently. "I have to go through puberty again…! But this time as the wrong gender! Well, at least this time I'll have more experience... though I never thought I'd be saying that about puberty. But what about my clothes…?" Her eyes began to roll back in her head, making All Might very uncomfortable. "Am I now a pervert of Mineta's calibre? Nooooo! Of course not! I am not a ped….! Gross! Gross! My friends… Kaachan will never get this off! What am I going to dooo…?!"

Then, she fainted with a thud.

All Might sighed.

"Great. I am stuck with two unconscious ladies and I don't even know where they live…"

All Might let out a heavy sigh, surveying the situation before him with a mix of exasperation and bemusement.

"Well, this is a pickle," he muttered to himself. "One unconscious lady suddenly realising she's got a whole new wardrobe situation to tackle, and the other... well, unconscious for physical reasons. Just another day in the life of a hero."

He knelt down beside the fainted figure of Izuku, contemplating the chaos of puberty round two. "Ah, the joys of teenage angst and unexpected transformations. Reminds me of my own awkward years... well, maybe not quite like this."

With a resigned shrug, he decided there was only one thing to do: wait for them to wake up and brace himself for whatever curveball life decided to throw his way next. "Maybe I should invest in a 'Hero's Guide to Handling Unforeseen Circumstances.' Surely that would come in handy right about now."

He looked at the sun that was high in the sky.

"At least I don't have to go through the trouble of looking for a successor." He smiled before there was a horrified look on his face. "I hope I can face Gran Torino when I tell him my successor is… a physically five year old girl but mentally fifteen year old boy who also happens to be a time traveller."

"Come to think of it, will I have to give my quirk to her now?" He mused. "She already has it, I felt it resonate with mine when she… splitted the ocean for a moment, which is quite a feat. Maybe, this new kind of One For All, what did she call it? Ah, Rewind For All, will surpass both One For All and All For One?" He grinned as his muscular form appeared once more with a poof of smoke. "Only time will tell, for now," He looked at the little girl who was waking up. "It's high time we prepared you for UA!"

As Chisaki stepped into Eri's 'room', excitement pulsed through him. He was on the brink of a breakthrough, his newest idea promising a leap forward for Overhaul's ambitions. But as he entered, anticipation turned to confusion. The room was empty, devoid of any trace of Eri. Frowning, Chisaki hurried to the CCTV monitor, his eyes narrowing as he watched the footage. There, on the screen, Eri's small figure skipped through a ventilation vent, disappearing from sight. Realization dawned on Chisaki as he understood the gravity of the situation.

"She cannot escape!" He yelled in anger. "I shall find you and save the world!"

TBC