A/N: Please check the end of the chapter for Author's Notes

'You yourself...will vanish from this world. And without your powers, you can't return to the world you came from.'

Chirithy's words echoed through Sora's head as he returned to The Final World, the young man absolutely exhausted after his encounter with Yozora. It had been a long and difficult battle, with his strength harder than ever to grasp, but he had managed to win. But why had Yozora attacked him, if he was told to save him, why attack? That was the strangest rescue he had ever been apart of to say the least.

There was no doubt that the encounter had actually happened, his exhaustion and bruises were certainly a testament to that. But before their fight, they had clearly been on the platform that represented his heart. How had Yozora managed to connect with his heart despite the two of them having never met before? So many questions and no way to get the answers he wanted.

"None of this...makes sense to me."

Sora had been walking alone for several minutes now, his brain wracking for answers as his movements were becoming more sluggish, each step becoming harder to take. The fight had taken more out of him that he cared to admit, unwilling to acknowledge that there were only flickers of his light left and that he was starting to fade fast.

He had to hold on though, he couldn't give up, not when his friends were waiting for him to come back home. Chirithy had told him he wouldn't be able to return to his world without his powers, but he wanted that with all his heart. And if he wanted it to happen, nothing was impossible. It was just like when he had rescued Kairi, people had told him that was impossible or that he wouldn't come back, but he had saved her. And he would come back.

"Everyone, just wait...a bit longer...I'll be home soon…"

Home, the word sounded so nice, how long had it been since things were normal for him and his friends. Easily over eighteen months now, ever since that fateful night when the Destiny Islands were lost. But now, Xehanort and the Organization were gone, Maleficent and Pete were a nuisance at best, and there were no other threats looking to throw the worlds into chaos. For the first time in over a year, they could have true peace.

He could finally tell his mother with certainty that there wouldn't be anyone else to fight like Xehanort to fight. Saying goodbye before the final battle had been tough, he never wanted to make his mom worry. He had promised her with a smile that he'd be back before she'd know he was gone and that everything would be okay. The mere memory brought a tear to his eye, he was sure she was worried sick, especially if Riku and Kairi told her about what had happened.

Sora wasn't sure how long he had been walking for, but Sora's mind had gone into thinking about what he'd done once he got home, once he saw his friends again. He knew he'd have to apologize to Kairi most of all, she probably blamed herself for him having to sacrifice himself for her. But, despite knowing how it all turned out, he wouldn't change anything about what he had done. They always found their way back to each other, it may take a bit of time, but he knew that one day they'd see each other again.

Unfortunately, that would not be any time soon, after walking for who knows how long, Sora finally collapsed, falling backwards with a loud splash that no one else could hear. He was completely exhausted now and he could barely find the strength to lift his head, let alone force himself back up. His hands were clenched tight as he didn't know what would happen next. Was he about to fade from this world as well, no one there to help him? Was he going to die all alone?

'You are not alone, Sora.'

Sora's head rose slowly, weakly looking around for the source of the voice he had just heard. It was certainly a soft voice, even softer than Kairi's if such a thing was possible. But try as he might, he couldn't see anyone else here. Empty as always since he arrived here again, aside from his encounter with Yozora.

"Who...where are you?" His voice was weak, it was hard for him to even speak now as he forced his head to lie back down.

'All that matters is that I am here to help you, Guardian of Light.'

Sora chuckled a bit at that, a random stranger wanting to help someone they had just met? Where had he heard that before?

'Your heart and body are on the verge of fading completely, from this or any world. During your last fight, you drew upon the vestiges of your power, making your light shine brighter for a brief period, but at a great cost. The last of your strength is fading, your light soon to be completely extinguished and snuffed out.'

"Not my fault, Yozora wanted to pick a fight...even though he was supposed to save me…" At least, that's what he had told him, but who knows if that was true. There were definitely better ways to go about saving someone than fighting them...though, Sora would freely admit that sometimes someone needed a good hit on the head to knock them back to their senses. But normally, those people were being possessed or manipulated by the bad guy.

The unknown voice seemed to chuckle at that comment, apparently amused by it. 'Yozora's intentions are pure, he just has an odd way of showing it. Still, I fear not even he will be able to save you at this rate, now that his heart has returned to his own worldline.'

"World-line? I've heard of different worlds, but worldlines?"

'Yes, you actually caused a new worldline when you broke the nature taboo that Chirithy spoke of before. One where the Thirteen Darknesses emerged victorious and then one where the Guardians of Light triumphed. Yozora comes from a different worldline entirely, not one created by a divergence in time. Very few throughout history have been capable of this feat, most of which belong to the ancient Keyblade Masters.'

Sora blinked at that, he knew there had to be Keyblade Wielders that existed long before him, Xehanort and Master Yen Sid were proof of that, but from that long ago? And they had been capable of travelling to these different worldlines? They must've been extremely powerful if they were capable of that and remaining whole in both body and heart.

"Wait, are you here to send me back to my own worldline then? I have a lot of people wait-"

The voice sighed a bit, cutting Sora off. 'Unfortunately, with the state that your body and heart are currently in, it is beyond even my power to send you back to your own worldline. The strain it would put on your body would kill you before you arrived there.'

"Oh...I see…" Sora tried his best to not sound bitter at that news, but it slipped out regardless. He had really hoped that this mysterious stranger was going to send him back. "Then why are you bringing it up if you can't send me back home?"

'Because, there is another worldline that I can send you to, that will guarantee your survival. If you should stay here, then your body and heart will perish completely and then it will be beyond anyone's power to save you.'

Sora closed his eyes for a moment as the voice told him that his only options were to stay here and die or go to a new worldline and survive there. He was definitely going to take the latter option, but he had to know something. "If I go to this other worldline, is there a way for me to get home someday?"

The voice sighed again, though this time there was sadness behind it before she began to answer. 'In theory yes, however it could be anywhere from a few months to years before your power is back to that point. The worldline I would be sending you to works differently from the one you come from, they do not have magic there, nor are there other worlds or even Keyblade Wielders there. Due to how little of your own power remains, what is left can best be preserved and given a chance to heal and grow again in this worldline.

Your body will adapt once you arrive in this world, converting your remaining power to fit with the laws of that world. From there, it will be up to you to nurture your power and develop it. You have a special gift that allows you to bond easily with others, I'm sure that if you make plenty of connections, your power will be restored quickly.'

Sora relaxed a bit as the voice explained to him what would happen once he crossed into this new worldline, well it was new for him anyway. The water was beginning to rise slowly, now brushing against his fingers and legs. His time must've been short now, soon he was going to sink into the abyss, unless this stranger saves him like she's promising to.

"Well, that's good at least, should be a piece of cake." Sora laughed a bit, though it sounded tired, all he wanted to do was rest now. He was completely spent and his eyes were beginning to drift closed, though he tried to keep them open just a bit longer. He would sleep once he knew he was safe.

'I'm glad that that you're confident. Just remember to keep your light strong Sora, your heart will guide you in this new world as it always has. The darkness in this world will be vastly different from what you're used to, but I know you'll make it through.'

The voice sounded more cheerful now and closer than it had before, despite the voice coming from all around him. It seemed to be getting brighter as well, like a light was being focused on him as the water continued to rise. Was he going to sink into the abyss before his savior could save him?

"Thanks for your help, but I have to ask...who are you anyway? I didn't think there was anyone else here."

The voice giggled a bit at that question as the light got brighter and brighter, the water enveloping him even faster than before. He felt so warm, but cold at the same time, it was odd. His eyes were barely open now as his vision was almost blinded by the light, most of his body now underwater.

'Let's just say that you've saved me a few times throughout your adventures. We've never met before, but if it wasn't for you, I would've been lost a long time ago. I'm just using a bit of my power to keep you whole.'

Sora smiled at that as he drifted off into slumber, the water and light now enveloping him completely, the light a thick aura surrounding him while the water seemed to be drifting him away to his destination instead of just sinking below. The last thing we could make out before his eyes closed was a heart as the voice spoke to him one last time.

'May your heart be your guiding key, Sora. And welcome to the world of Heroes.'

Dagobah Municipal Beach Park

9 Months Before U.A. Entrance Exam

The sun had just reached its peak during the end of the first month of Izuku Midoriya's training under All Might in order to prepare for the U.A. Entrance Exam and to receive his Quirk, One for All. Progress so far had been a bit slow, but progress was being made nonetheless.

Toshinori had told Izuku to rest for a bit as outlined in his Fitness Plan, after all, rest was something vital when working to train your body. It was at this moment that the two of them were sitting on a bench overlooking the beach, with Izuku chugging a bottle of water to hydrate himself.

"Young Midoriya, you really should drink a bit slower, don't want you to choke on your water. It's meant to refresh you, not make you need more rest"

The green haired young man laughed a bit awkwardly as he pulled the bottle away from his lips, about half full still. "Sorry, guess I'm just a bit excited to get back to work." The last month had left him exhausted, but knowing what waited for him in the future, he was looking forward to all the sweat he was going to put in.

All Might laughed a bit at that, sipping on his own drink as he looked at the trash filled beach. You could make out a couple of small spots where the garbage had been moved over the last month, but there was still a lot more to go before the beach would be cleared.

"Of course, you've been working very hard this last month and I couldn't be prouder. Just make sure you stick to my plan and you'll be ready for the exam."

Izuku nodded as he was about to respond, before a flash of light obscured his vision, same with Toshinori. The boy managed to regain his sight first and what he saw concerned him immediately. Out of nowhere, there was a teen falling out of the sky, rocketing towards the water by the beach. And he didn't seem to be conscious if his lack of movement or panic were a good indication.

The thought about where he came from or what was going on didn't even cross his mind as Izuku began to get up and run towards the water to try and swim out to save the stranger that was close to hitting the water. By the time that he got to the stairs though, All Might had already transformed into his muscular state and was already in the water from his speed, that smile on his face like always.

"Do not worry, for I am here!"

The unconscious teenager collided with the water, with All Might reaching him just a few seconds after and rushing him to shore. The pro hero wasn't even out of breathe from the mile swim that he completed in thirty seconds. With the utmost care, All Might laid the boy onto the beach, immediately noticing that the boy had cuts and bruises all over his body.

Izuku made it to his mentor a few seconds later, eyes widening at the condition the other boy was in. Where had he come from anyway, he hadn't heard any planes or helicopters in the area. Was it some type of teleportation quirk? "I-Is he okay, All Might?"

The pro hero didn't respond though, putting his head next to the boy's chest and putting two fingers on his wrist, checking for a pulse. He began to fear the worse when he heard nothing, but a faint heartbeat was felt after fifteen seconds. The boy's injuries must've been much worse than what they appeared to be on the surface. If they hadn't been here, who knows what could've happened to him. Thankfully, there was a hospital nearby and he hadn't used much of his time today.

"I need to get this boy to the hospital! Young Midoriya, you are welcome to come visit, but there's no time to waste!" With that, All Might scooped the young boy up and made sure to carry him in a way that would give him plenty of support as he rushed him to the hospital. As civilians noticed him running towards the hospital, the hero had only one question on his mind as he had no doubt about getting him to the hospital in time for treatment.

'Young man, where on earth did you come from?'

And there we have it, the beginning of what looks to be a long journey for Sora in the world of My Hero Academia. I've been a fan of Kingdom Hearts since it first came out in 2002 and have wanted to write stories for it for a long time, though I could never figure out exactly what I wanted to write. Then over the last month, I marathoned through My Hero Academia and have caught up to where the series is at in the anime. Watching that series and watching Izuku and the others grow throughout it, reminded me a lot of Sora's journey over the course of the KH series.

Now with ReMind having come out and especially with how the Secret Episode ended, I immediately saw a lot of potential for Sora to end up in a lot of different franchises and the story potential that would bring. There were a couple of other franchises that came close to getting a story such as RWBY and I might dive into that in the future, but crossing between My Hero Academia and Kingdom Hearts is what excited me the most when I made my decision to start this project.

I would appreciate any and all feedback as this is my first story that I've started in a few years and it's going to take me a few chapters to try and get the rust off. Thank you all for reading, and I hope you look forward to the next chapter.