I do not own this property or these characters, I just had an idea of crossing over Kingdom Hearts and Re:zero. The story will take place after Kingdom Hearts 3 ReMind, after Sora had disappeared. Regarding Re:Zero, it will take place the exact moment Subaru was teleported to the new world by Satella. I will do my best to keep things interesting since this is my first fanfic writing.

Chapter 1: Reawakening

'I've been having these weird thoughts lately...is any of this real or not?'

The boy who had saved the worlds countless times thought to himself as he faded into a deeper darkness after having spoken with the girl he desperately wanted to save after she was struck down by an old man, Xehanort.

As his sub-conscience was beginning to fade away from him, he thought about his friends and the journey they all had gone in since his homeworld was swallowed by darkness. He thinks about his two faithful companions, Donald Duck and Goofy. He was grateful to both of them for having been on his side from the beginning of their journey when he was searching for his two best friends, Riku and Kairi.

He thought about the two dearly and how he managed to save them after having lost them so long ago when he first received the weapon of light, the Keyblade. As his mind finally blanked out, a voice had spoken out to the unconscious boy,

"Surprising that you actually managed to mess with time, makes me a little jealous of you then again you are right here. Suffering the consequences of not only breaking a taboo but abusing the Power of Waking."

The mysterious voice had taken form into one wearing standard black coat like Organization XIII. He began to approach the young boy floating in a realm of nothingness while continuing to speak in a curious tone,

"Sora, the Keyblade's chosen one. What an interesting boy, kind hearted and somehow the key of stopping darkness from prevailing. You know, I want to test your actual strength. Let us see if your kind hearted nature can take on a world where kindness is rare to find. A world where darkness is guaranteed to prevail. Oh man! This is going to be soo much fun to watch!"

The mysterious figure approached Sora and touched his chest, creating a small light. As he did this, he began to contemplate whether to strip the young boy of his power to truly put him in a situation where he would have to rely on the darkness.

This idea caused him to try exactly that but all of sudden his hand was hit by some power that gave a little sting-

"Ow ow ow ow! What in the world was that?"

This confused him greatly since that had never happened before, which caused him to try again only to be met with another sting to his other hand. This greatly annoyed him which ended in him complaining,

"This is so unfair, I want to take away your power but its not letting me! Darn, this would've been fun to see you back to zero but I guess I'll just have to do with what I got. But don't get me wrong, Sora, just because you are strong doesn't mean your life in this new world won't be easy."

As he finishes speaking, he pushes the young boy towards a portal nearby them, interested to see whether the hero who had saved the worlds countless times.

'Huh? Where am I? Am I dead? No...this place is...'

A new world.

Sora looked around and saw that he was pulled to a new world, something that greatly confused him since everyone had been telling him that he would suffer some consequence if he was to abuse the Power of Waking. He was confused on why he was in a new world yet he feels like there might be some purpose in having been transported in another world.

Sora started to walk around this new world, seeing many interesting things such as demi humans, ground dragons, and many people with interesting attire. This excited the young boy since he is exploring a unique world which caused him to speculate whether the heartless are affecting this world as well. As he thought about this, he wanted to make sure that he still had his Keyblade with him. He put his hand up and quickly the Kingdom Key appeared in his hand, allowing Sora to confirm that he still had his powers from the journey he had undergone when having gone to save Kairi.

'Okay, so I still have all of my strength with me.' He thought to himself, 'But I'm confused, if I was to suffer a consequence for having abused the Power of Waking, what is the punishment?'

As Sora was walking around thinking to himself of the consequence, he looked up and noticed a very young golden hair girl running extremely fast as if she was wrong. This caused him to quickly ask the girl,

"Little girl, do you need any-"

"Out of my way!"

The girl had shoved Sora while continuing to run quickly, which greatly concerned the young boy. Sora quickly began to chase after the girl, wanting to help her out in the case she is in danger.

Sora ran all the way towards the slums, he ended up losing the little golden hair girl which left Sora a bit uneseased since he hopes she is alright. As Sora stood looking around, he was feeling a bit off by the atmosphere the slums were giving him. He looked at the people living there and could see that they were suffering. Sora was heading to approach the people yet he ended up hearing a female voice say behind him,

"There is nothing you can do for them, child."

Sora turned around and noticed a woman who had long black hair tied into one tail on the left side along with eyes, wearing a black dress. Sora looked at the woman with uncertainty since he was surprised that she knew what he was thinking. He had asked her why she said that to him to figure out how come she said that. To his surprise she answered in a respectful manner,

"Throughout my life, I have seen many people with the same eyes as yours. Wanting the desire to help others. It is one that I cannot relate to honestly."

"Still, I want to help them."

The woman looked at the young boy with rather interest in her eyes, having never seen anybody wear such an attire as his. She observed the boy before asking him if he is from around her. Sora paused for a moment to think long and hard on the question. He recalled back on his conversations with Donald and Goofy about telling others of the existence of other worlds. He crossed his arms before answering the woman in a calm and happy manner,

"I'm not from around this place but I'm happy to know the place."

"Hmm you are quite the interesting boy."

Sora looked at the woman and showed his hand in a manner of wanting a handshake from her while saying in his friendly manner,

"The name is Sora, what is your name?"

"My name is Elsa Granhiert, you can just call me Elsa."

Elsa shook Sora's hand, enjoying the politeness of the young boy before attempting to learn more of this strange boy. As the two were beginning to walk, in the shadows the mysterious figure appeared from a portal, having watched Sora so far and feeling displeased.

'This is sooooo boring, he is just running around without a care of the world. There is no hardship here. Well I guess I better spice things up for my amusement.'

As Sora and Elsa were walking together, a couple of dark figures respemblings ants that had claws and legs surrounded the two. Elsa looked at these creatures with interest, having never seen anything like them before.

Heartless!

Sora instinctively summoned his Kingdom Key and prepared himself to battle; Elsa looked at Sora and was more interested in the young boy, having seen the weapon the young boy was wielding. Before examining the weapon closely, she hears the young boy say to her,

"Stand back Elsa, allow me to deal with these heartless."

'Heartless? Is that what they are called?' Elsa thought to herself as she listened to what Sora said. She steps back and allows Sora to face off against these new creatures she has never encountered before. 'This boy just keeps interesting me even more but honestly, who is he? What kind of divine protection does this young boy have? And what kind of creatures are these so-called heartless are?'

Sora charges at the heartless and quickly begins swinging his Keyblade at the heartless, managing to take down many of them within a few hits. As the shadow heartless disappears with one strike from the Keyblade, the hearts that the heartless contain appear and quickly head up towards the sky before disappearing. Elsa noticed this and quickly began to analyze everything she is witnessing,

'This boy has quite the fighting skills and these creatures once killed release hearts...now this might be worth my time.'

Elsa pulled one of her knives and quickly joined Sora in the fight once she noticed that many more heartless began to appear, some looking more menacing than others. She went towards the stronger looking one that was wielding scalloped, blue-bladed swords. The heartless noticed Elsa and quickly charged towards the woman, not showing any kind of emotion.

The heartless attempted to strike down Elsa yet she was too fast for the Heartless to keep up. Eventually she used her blade to slice up the stomach area of the heartless, curious to see the inside of this new creature but to her surprise the Heartless didn't seem like it took any damage.

This caused her to start giving each of her attacks with more strength than before. This paid off since she was able to kill the heartless yet she was surprised that no heart appeared once she killed a heartless. She looked at Sora and began to think to herself, 'I'm curious, Sora, what exactly is that weapon of yours and what are these creatures you are easily taking down.'

As Sora defeated a few soldier type heartless, he quickly looked at Elsa and was surprised to see her managing to take down heartless easily as well. He gave her a smile and asked if she was alright.

Elsa was unsure on how to respond to the boy's kindness since everyone in Lugnica feared her due to her affiliation and status while this boy is oblivious to such a thing. She smiled at him and said she was okay before asking Sora what was the weapon he was wielding, noticing the odd key looking sword he had. Sora summoned his Keyblade while responding,

"Oh this? This here is called a Keyblade."

"A...Keyblade? Mind if I take a closer look?"

"Sure, Go ahead."

Sora handed the keyblade to Elsa to allow her to inspect the weapon, noticing how curious she was. Sadly this inspection ended short when the keyblade disappeared from her hand and returned towards Sora's.

"I see, it seems like the weapon is unique and chooses its owner. You are quite the interesting boy, Sora, but sadly I have to go meet up with someone since it is starting to get a little late."

"I understand."

As Sora was about to let Elsa leave, she was still too interested in the boy to just split paths, causing her to turn around and say,

"You can join me if you like."

"Are you sure? I wouldn't want to hold you back."

"It's alright, besides I have many questions to ask you."

"Alright then."

Sora smiles at Elsa and begins to follow her towards a building nearby. During their little walk, Elsa begins to ask questions such as where is the young boy from, where did he get such a weapon and what exactly are the heartless. Sora was careful to not give any signs that he is from a different world and just answered that he was from a different country.

He then responded to her second question by stating that the Keyblade chose him to be its wielder when the heartless attacked his homelands. Lastly, he only told the woman that the heartless were people who lost their hearts to the darkness. Elsa grew more and more intrigued by this yet as they arrived to the place she needed to be at, she looked at the young boy and said to him,

"I don't think you are aware of this but I'm an assassin, so things might end up turning for the worse."

"That's funny, I actually am friends with a pirate."

"Pirate?"

Sora paused himself, a bit off that there are no pirates known in the world he is in yet he started to regret having said that since he doesn't want to break the world order. He quickly dismissed what he said and assured Elsa that he will be alright. She nodded at the young boy and started knocking on the door. After a moment of waiting, the door open to reveal the little golden hair girl Sora had been looking for earlier.

"It's you!"

"Oh right, sorry about earlier. I had to shake someone off."

Sora laughed it off and introduced himself to the little girl, which was named Felt. As the two got acquainted, Felt turned to Elsa and asked her whether she knew Sora. Elsa looked at the young boy for a moment before responding with,

"This young boy and I just recently met but I brought him with us since I want to question him a little more later after our meeting."

Felt nodded at what she heard and just shrugged it off before allowing the two to enter the building. As they enter, a giant looks at the two and welcomes them, introducing himself as Old Man Rom. Sora got along with both Felt and Old Man Rom, managing to learn more of the world he was teleported in.

Once the meeting got underway, Felt took out something that Elsa had asked her to fetch before pulling out a bag filled with silver coins. The negotiations went smoothly until Elsa put the glass of milk given by Old Man Rom and started to say to them, "With the exclusion of Sora here, you two are sadly under contract for my employer to get terminated. As said, no witnesses."

Elsa immediately pulls out her knife in an attempt to slice Felt's stomach but the little girl was fast enough to dodge the attack.

"Elsa, What are you doing?!" Sora shouted in a state of panic and surprise. Elsa looked at the young boy and quickly responded, "I did not wish you saw this, considering your good nature but if you choose to act, I will be forced to kill you as well. I do not wish to kill an outsider that not only has nothing to do with my contract but someone that actually catches my interest aside from their bowels but I will if you do get involved."

Sora stood in shock while Old Man Rom began to swing his giant spiked club at Elsa, who was easily dodging each attack. In the heat of everything the young keyblade wielder began to reflect back on what Elsa said, having brushed the warning she had given earlier to him. He was unsure on what to do yet seeing that Old Man Rom and Felt were good people, he couldn't let Elsa harm them.

Just as Elsa is about to go on the offensive, Sora was quick enough to deflect the attack before it could do serious damage. Old Man Rom was surprised by this and quickly with his weapon backed away from the two.

With Sora in between the two fighters he looked at Elsa and started to plead with her,

"Please Elsa, don't do this. I know you are this assassin but they are good people. You got what your employer wanted, let them go."

"I think you failed to hear that they also stated that I leave no witnesses. I didn't consider you a witness since you honestly don't know what is going on and I brought you along within my own accords. Sadly you have chosen to fight on their behalf, making you my enemy."

Sora looked at Elsa with some hesitation in his facial expression, not wanting to fight someone he just fought alongside yet he knew that there wasn't anything he could do to convince her. She was fulfilling the contract she had, which caused him to go into his fighting style. As he does this, he turns to Felt and tells her to leave.

"But I can't leave you and Old Man Rom on your own with this sadistic woman…!"

"Sorry Felt but the boy is right, I won't allow you to be here where there is clearly danger. Now go!"

As Old Man Rom finished speaking, both him and Sora charged at Elsa; This gave Felt the opening she needed to escape the bar. Elsa noticed this and said in a slightly bitter yet sadistic voice,

"Seems like I'm going to have to hunt down that girl to fulfill my contract."

"I won't let you hurt my Felt!"

Old Man Rom quickly went on the offensive towards Elsa, determined to kill her in order for Felt to survive.