Hey there everyone! I wanted to present to you an awesome crossover that I came up with and it's been stuck with me ever since Persona 5 and Kingdom Hearts 3 were released.

There's also two things I want to warn you about.

Disclaimer 1: I don't know any content of the Persona or Kingdom Hearts series, they belong to their respective creators, Kouji Okada and Kazuma Kaneko of the Persona series and Tetsuya Nomura of the Kingdom Hearts series respectively.

Disclaimer 2: This will contain spoilers for Persona 5: Scramble Phantom Strike and the Kingdom Hearts 3 Re:Mind DLC. If you wanna see the games' played by other gamers on YouTube or Twitch, or if you wanna play those games for yourself, stop reading this, play or watch the games and then come back here so you may have a clear understanding for this fanfiction. If you don't want to read this, then turn back now!

Well, with that said, I present to you, Persona 5K: King of Hearts.

Chapter 1: A Key Reforged

Inside of a lab of the Zavadoski Corp, a young bald boy opens his eyes, his left eye was a beastly blue, while right eye was a shimmering rose pink. He weakly looking as he breathes softly through a respirator, he was in a tank, filled with lukewarm water, calming his body, seeing he was down to his underwear, his skin a healthy white.

He looks beyond the glass he's contained in, seeing adults in lab coats, looking through the consoles, technicians on PCs, looking through the boy's body. One man in a black lab coat, with tablet in his arm.

"Sir, we're picking up some unknown energy through the subject." One of the technicians says to the main scientist.

He went to the PC and looks through. "Any unknown energetic we know of?" He asked her.

"Negative," She said, "Nothing like we've encountered sir."

"Try counter balancing it." He suggests, she does so, but something was wrong, as she tries to counter balance the unknown energy, it's starting to over power the counter balance.

In the chamber, the boy struggles through the prison he's in. Pounding on the glass, it starts to break. "Sir! The subject's trying to break out!" One of the scientists shouts, panicked."

"Lock down the room!" The black lab coat man shouts, looking at the boy's strength, cracks forming. "Lock it down! Lock it down, now!"

"Sir, the systems are overriding!" One the scientists shouts, the glass was starting to give way, the man was in awe.

He got his radio and reports, "Get me security over here and get Mr. Zavadoski!" The chamber shatters and shards shot towards the every single person in the room, some missed, some injured and others were struck in the heart, head and to the abdomen. The boy saw his attempt to escape, seeing the door. He swung it open and left the room.

The man saw the little boy escape, he grabbed the radio and calls, "All units, we have an escapee on the lose in Zavadoski Tower! Stop him!"

The boy ran down the stairs, as he was halfway down through the tower, he noticed a symbol on the left side of his chest, a heart with a color of light yellow faded to a crimson rose. What did this mean? He shook the question off for now as he resumes running down the staircase when he heard a group of security officers and guards.

As he finally made his way to the first floor of the tower, he sees with what he could count of 57 guards and officers, covering the front doors.

"Young man, this is security of Zavadoski Corp," A Sargent calls to him, using a megaphone, "You are ordered to surrender and put your hands in the air." The boy looks at the guards, frightened as he turns around to run, but stops as more guards covered the back way.

"Young man, you have nowhere else to go," The Sargent says to him, getting a little annoyed, "You're ordered to surrender and put your hands in the air, now." The boy could sense the stern tone in the Sargent's voice. He tries to show him he's now afraid of him.

The Sarge wasn't even having it. "Men, open fire!" He commands, the men pointed their guns at the boy. The boy yelps as he covers his face with his arms. The bullets zooms towards him, but they don't harm him as he uncovers his face and looks. The guards and officers were dumbfounded by what just happened, a barrier was surrounding the boy, protecting him.

The officers were in gawk and awe.

"How the hell did he do that?!"

"That's not human!"

"Do we have any idea as to what we're dealing with?!"

"It's a demon!"

The Sarge, who had his jaw dropped, regained his composure and readies to take command again. "Men! Grab the boy!" Two of the officers charges at the boy and grabbed him by his arms. He yells, begging them to let him go! All of a sudden, a loud roar was heard inside the building, echoing throughout the tower.

"What the hell was that?" One of the guards asked the Sarge.

The Sarge looks at a batch of his troop and said, "You, go look where that roar came from." The batch was hesitant, but they reluctantly agreed to go. As they went to check, the doors blasted opened on the first two officers, the rest of the troop was shock and ran back to the Sarge screaming.

"Sargent Takahashi! Retreat! Repeat! Retreat!" One of the guards shouts as a leonine creature rushed towards the troops.

The Sarge was in shock of the creature and it's size. It has a relatively lean body structure and a long tail that ends in a segmented tip. It has three large, curved claws on each of its four paws and two flat spikes on the outward sides of each of its legs. The creature's most striking feature is its large, stiff mane, which surrounds its entire head and trails onto its upper back. It has four short, sharp fangs in its mouth, a flat snout, and tall ears that point forward. Its triangular eyes are heavily outlined in black and feature odd markings resembling a stylized Eye of Horus. Its forelegs are decorated by spirals and ring shapes, while its hindquarters are spotted with large, solid circles. It also bore the same symbol on the boy's chest.

The boy looked at the leonine creature and somehow remembers it's name. "Aura Lion!" He shouts at it, the lion turned it's head looking at him, seeming it would take it's commands from him. "Help me!" The Aura Lion pounces at one of the guards, letting go one the boy's right arm.

The security was in shock and started a panic.

"Holy shit!"

"Where did the hell that thing came from?!"

"What the hell is that?!"

"I'm not paid enough for this kind of crazy shit!"

"Men! Open fire at him!" Takahashi commands and they fired, the bullets ricochets off the lion's body, looking at the guards firing everything they got. The lion roars, as if it was calling. Screeches and roars were heard. Then all of a sudden, mint green, eagle-like creature soared and crashed through the glass walls.

Its electric indigo wings and tail look like blades with school bus yellow tips on the wing tips and matching trim on the tail edge. It's beak, legs, and tail are outlined in school bus yellow. Its eyes, horns, body, tail, and claws are mint green. The upper legs are electric indigo with steel pink lower trims. The fur on its neck is cream-colored with a mint green fade, and its chest is steel pink-colored with two pale yellow spots on both sides of it's back above the chest-line.

"Halbird!" The boy cheers, the creature soars, swept the young boy away from the guard. The boy climbs on it's back, holding on tightly. He looks at the rampage of more creatures that too crashes through the outside glass walls.

He calls the other creatures by their names. "Thunderaffe, Zolephant, Eaglider! Defend the other small creatures! Wheeflower, Woeflower! Tend to those who need help! Skelterwild, Keeba Tiger, Yoggy Ram! Take care of the guards!"

Takahashi couldn't believe what was happening, his men were being tossed like rag dolls by bigger creatures, smaller creatures latched onto their faces, or to the back of their heads, or knocking them to the walls or pillars.

The Halbird lands and the boy got off it's back and told it to help the others. It understood and flew to join the other creatures.

Takahashi saw the opportunity to kill the boy, handgun in hand, finger on the trigger, he shot the boy's right shoulder. He yells in the pain, going down on his knees and on his left side on the floor, clutching his right shoulder. Tears were streaming down on his face.

"I gave you a warning and a chance for you to surrender child..." The Sarge said coldly to the boy, "But all you did was push my buttons and piss me off." He pointed the gun's barrel to the child's head.

Then a voice called to the boy, a older teen from what it sound like. "Don't be afraid..." He said to the boy, "And don't forget..."

Takahashi was about the pull the trigger, but his arm was grabbed and pulled away by not a creature from the boy... it was a man, in his early 40s, black and gray Caesar cut hair, a stubble beard, navy blue eyes, white skin, wearing a black suit and tie with a white shirt. This is the man who runs the Zavadoski Corp, the CEO and leading chairman. This is Hideo Zavadoski.

"No Sargent Takahashi," Zavadoski said, gripping tightly on the second-in-command's arm, moving the gun away from the boy's head, "Keep him alive."

"What?!" Takahashi was dumbfounded, first his men was taken down by strange creatures and the CEO wants this... this... boy, alive?! "But sir, he nearly killed every member of my squad! He could kill someone with creatures like those!"

"Ah yes, speaking of which..." Hideo let go of the Sargent's arm and turns to the boy, "Young man, would be so kind as to call off your friends? I apologize if these people gave you trouble."

The boy looked at the man, he was scared of him... was he trying to trick him, or was this a truce? He looked over at the creatures, seeing what chaos he had created. "Everyone stop!" He shouts at the creatures, they stopped and looked to their master and walked towards him.

"You have an incredible power young man," Hideo remarks, looking at the different creatures he had summoned.

"They're my friends." He said to him, "They could tell if I was in trouble, but I don't know why I have this power..."

Hideo looks at the boy, seeing the troubled look on his face. He looks at Takahashi and said to him, "Mister Takahashi?"

"Sir?"

"I believe that this talented and gifted young man deserves some clothes. We can't have him wandering around Japan just in his underwear."

The boy looks at himself, know he was right. He blushes at the man in embarrassment, he covers his chest with his arms crossed.

"Do you have a name?" He asked the boy.

He does, though he doesn't know if it belonged to him. Then he heard the voice again, calling him to the same name he had thought of. "Sora..."

"Sora?" He asked himself, though the chairman heard it.

"Your name is Sora?" Hideo asked him.

The boy looks at Hideo, only knowing the name and the only thing to go with, he then confirms it to the man in black. "Y-Yes... My name is Sora."

"That's a very nice name Sora," Hideo commented him, he then reached out a hand for him to shake it, "My name is Hideo Zavadoski, I'm in charge of the Zavadoski Corporation. I apologize for keeping you in a chamber, but you were injured from a car accident, so I took upon myself to save you and nursed you back to health."

Sora could hear the soothing and calm tone in the man's voice, he also sounded sincere and honest. Hideo then continues on to say that he was from the Shinagawa City Office Child Care Support Center, he was going to be adopted under Zavadoski's name, but during the time, he was outside playing tetherball with the other kids. He hit the ball so hard, the rope broke and it went to the street, he went to chase after it, but he was suddenly hit by a Toyota Alphard, damaging his rib cage and a serve head trauma.

Sora broke down crying when he heard about his near death. "Why?" He cries, "Why would someone hurt me?"

"I don't know son," Hideo admittedly said, "There's a lot of people you need to watch out for. The people who lies, hurt, kill, steal and manipulate others to achieve their goals for their follies."

Sora hugged the CEO, bawling onto the man's shoulder. Hideo could see the sadness he had, so he picked him up, cradling him. "Come, we have some catching up to do." Hideo said to him, heading to the elevator and returning to the top floor.

Hideo looked down at the city, his tower housed the best security guards, officers and systems, best known in the world. Back at the age of 20, Hideo Zavadoski was a working man for railroad work, however, he came with disagreements along with other workers, explaining the scar on the left side of his neck, nearly killed from a rail fork. After his days of railroad services, he was no longer required. He then went to college for science and mechanics, learning about how the body works. He reflects his life from looking through his office window. From being below of bottom dwellers, to the top, sky high with successful businesses and donations for other organizations, as well bought the other competitors companies, so much so, it would make the Walt Disney company a less profitable organization.

He heard beeping from his watch, he looks and realized that it was to take the sedative. He always hated using the drug tube with a needle as he would call it. He then sees Sora being escorted by the black coat scientist.

The young boy was in a black long sleeved jacket, a gray stripe from the shoulder to the bottom of the sleeve, the sleeves, collar and bottom of the jacket was a little rosy red color, leaving his jacket open, exposing his gray blue tank top. He also wore black shorts, dark gray showing through for his pockets and some black shoes with a white rim on the bottom.

"Mr. Zavadoski, Sora is ready for you." The scientist said to him.

"Ah, Dr. Dominic, very good," Hideo said, glad to see Sora fully clothed, "Sora, please, come and stand by over the window. I hope those clothes are comfortable. I made them when I first saw you at the orphanage." Dr. Dominic looked back at Hideo, a grimace look gave Hideo a sadden look.

"They're really comfy sir, thank you." He said politely, he looks over at the window, seeing how high the tower is. He was fascinated by huge Japan was. "Wow... everything so beautiful!"

"Liking the view?" Hideo asked him, he was still trying to set up the sedative and got the needle ready, "It's one of my favorite spot to look at. Oh and you that mountain? That's Mount Takao, one of our mountains of Japan, though not one of our tallest." He gave out a chuckles while he grits his teeth, injecting the sedative. "Heck, our building isn't tall from that stand point of the mountain."

"What is the biggest then?" Sora questions Hideo, the CEO walks behind him and rests his palms on the boy's shoulders, like a goliath protecting it's young.

"Our tallest mountain is Mount Fuji," Hideo answers, "Over at twelve thousand, three hundred, eighty nine point two feet tall and a hundred thousand years old, it stands as one of our oldest and greatest mountains in all of Japan."

Sora was in awe from Hideo's statement, looking at Mount Takao again, he looks at the dusk orange sky, seeing the stars that comes out early. "Oh, wow! Look at the stars!"

Hideo looks at the stars and smiles. "Ah, yes, the worlds shine themselves again." Sora looks at his adoption father confused, what was he talking about? "Well, they say that our world is connect by one great big sky and our world we stand on today is one of those stars." He gave out a chuckle again. "But that's what Dr. Dominic believes."

Sora gave him a troubled look. "You two don't get a long that much, as well with Mr. Takahashi, do you?" The young boy asked him.

Hideo chuckles and said, "Let's get you to bed, there's a lot of things we need to do." He didn't want to reveal young Sora his relationship with Dr. Dominic, in fact, it was rocky. Dr. Greggory Dominic was one of the brilliant and smartest men Hideo knew. He knew him when he was 26 and Dominic was 18 at the time they met. After the Zavadoski Tower was built, the black coat doctor had formed out schematics for a lab at the very top floor, which of course Hideo was impressed by. However, through a little arguement, Hideo's office was made for Sora's new room for him to stay in, while the lab was located under the CEO's office's level.

In the lab, Dominic looked around in his office, just one of the talented minds that would've operated on his own, if it wasn't for Hideo's guidance and philosophy.

There was a knock on his office door. "Enter." Dominic said sourly. Takahashi enters the office, just as sour as Dominic was.

"Hideo's making a mistake keeping that subject alive." Takahashi snarls, "What made him in his mind think that he could make it his son?"

"I don't care for the boy Takahashi." Dominic said coldly, "Hideo's been in his position of power for far, far too long." He looks at the plans and schematics of his old lab layout, something he wanted to make for years. "I approached to him for making a place to create soldiers to keep our world safe... instead he treats it like garbage, saying things like, 'It's too dangerous doctor,' or 'What happens if someone dies?' Fool... the only thing I care about are results and perfection."

"Hideo seeks the same thing, Greg," The Sargent said to him, "He's only failing to see what true and liable capabilities it has for your project. I did support you after all."

Sargent Matsuro Takahashi was part of the Japanese Imperial Forces for over sixteen years, starting at the age of fifteen, he became one of the youngest members of the squad called HAZE. At one point in his career, he fell in love with a woman named Shazaki Sakurai and proposed to for her hand in marriage, but before she could answer, they were ambushed by an American Terrorist/Assassin group, only known as The Hushed. When he and the team found the assassins, they were sentenced to prison for 36 years, but that wasn't enough for Matsuro, he wanted to see them dead, hanged or executed for their crimes, not imprisonment.

After he left the squad, he went to work for Hideo's corporation, but throughout his career as a second-in-command, he's one of those serious and sour faced Sargents. He formed a brotherhood with Dr. Dominic as they have similarities to one another, both wanting true justice and seeing things unfold in their own way.

"Of course," Dominic said to him, "But throughout your support, Hideo still manages to make his ideas plans into reality." Dominic looks above to the midnight sky. "One day, my patience with Hideo Zavadoski will run out and I will get my opportunity to strike back against him for rejecting my ideas and plans."

"What about Sora?" Takahashi asked him.

"What about him? He's nothing more then a little speck."

"He's going to be a pain in our side Dominic, Hideo's planning to make him the new CEO of the Zavadoski Corporation."

Dominic was infuriated, he thinks that he can make a boy take his place and run his orders? He kept his calm demeanor and he forms a plan. "Not to worry Takahashi, I'll make sure that Hideo will make sure he'll see things my way..." a grimacing smile forms across his lips, knowing it will work.

Hideo opens the door for Sora, showing him his new room, the walls and ceiling were a blank white, no bed, no carpets, no windows, just an empty white room.

"Right, here we are." Hideo said, setting Sora down.

The boy looks around the room, he made a frown and looks at his adoptive father. "There's nothing in here sir," he said to him, looking around the room again, "Is this suppose to me my room?"

Hideo nods, knowing Sora wasn't getting the bigger picture with his room. So he hatches an idea. "Well, there's nothing in here is because that you have the power of imagination." He said to him, kneeling down to the boy's height. The boy tilts his head. Hideo then reaches into his jacket and hand Sora a remote.

"You're born with a gift Sora," Hideo said, smiling to the boy, "Nobody has kinds of talents like you do, within many great powers and gifts not only comes with great opportunities and possibilities, but also responsibilities. Your powers only needs to stay in this room, nothing must come in, or out. The public isn't ready for you yet, but I promise, when I make the biggest announcement on your fifteenth birthday, you'll be ready to take on the world."

Sora looks at the remote, notice it has the same symbol he has as well his creature friends. He pressed the button and suddenly, splashes of blue, rosy pink, lime green, orange, purple and yellows covered the black canvases off the walls and ceiling. Two beanbag chairs suddenly form from the far left cover of the room, they were a orange and yellow colors. A desk took form, with cupboards with little spiral handles. So much was forming right in front of Sora's eyes, he couldn't contain his excitement, as he could then feel something form under beneath his feet, a mattress of somewhat with the same symbol forming for the top blanket.

Sora looks at the ceiling and a chandelier was formed, bright and beautiful colors were faded onto it, then suddenly the front wall became flowed and wavy, fading to see the sight of Japan's breathtaking view. He was amazed by what this room had. He took a couple of steps back and bumps into one of his creatures. He giggles as the Aura Lion nuzzles his chest, many other creatures. He suddenly remembers what these creatures were called, though he doesn't know when or where he heard of them. Spirit Dream Eaters.

"I... I don't know how to thank you sir." He said to him, he was at a lost for words.

Hideo gave Sora a hearty chuckle, carrying him to bed and tucks him in. "Actually Sora, I wanted to thank you," He indulges him, the boy tilts his head, "Today you gave me the greatest gift of all... having you as my son."

Sora happily hugs him again and he said to him, "And you're my greatest gift too... Dad."

Hideo was wide eyed, did he heard Sora call him Dad? He thought he did, smiling at the boy returns the hug, giving him and affectionate squeeze, not even wanting to let go.

They breaker the embrace and Sora covers himself with the blankets and the CEO went out of his room and said goodnight to him, the big Dream Eaters lays next to the bed, while the small ones cuddles next to Sora.

Hideo closes the door, taking a moment to reflect on what just had happened, he reaches in his jacket again and looks at a picture of his younger self and a woman with black raven hair and blue ocean eyes, laughing together.

"You would've loved him Ichika." He said to the photo, he puts the photo back into his jacket and went to find the elevator. He knows he would have to do any and everything in his power to keep the boy safe. What would the future hold for him? Who knows.

Whew! Okay, I know this one isn't as long, but I promise in the next chapters, I'll try to make them as long as possible. The next chapter will be an introduction to the Phantom Thieves and how they meet Sora!

Until then, see you real soon!