DISCLAIMER: I don't own the Kingdom Hearts nor Fire Emblem Three Houses characters, Square Enix, Nintendo, and Disney are the owners.

There were people who asked me to do the English version so they could read and understand the story, the problem is, is that my vocabulary isn't strong enough and im sorry if you find few mistakes. But I will give it a try.

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PROLOGUE

KEYBLADE GRAVEYARD

After traveling through various worlds and defeating countless enemies, a young spiky brown-haired man, Sora, finally made it to where his nemesis was standing, who was a bald old man with a sinister glare.

The old man, Master Xehanort was showing his true intentions, what he wanted to, was to open the Kingdom Hearts and in order to success, he needed the χ-blade but he lacked something else, something that was too essential to complete his evil plan.

"Kairi!" Sora exclaimed alarmed upon realizing of what he was up to.

In fact, the mentioned girl was the last thing Xehanort needed to fulfill his sinister plan, this was the reason that there were lots of Keyblade Wars, the χ-blade was that cause of too many casualties between both light and dark sides.

"You require motivation." Said the old man derogatorily in laughs, right before giving a death blow that ended the girl's life making her disappear in white particles, provoking the boy in the process.

"KAIRI NO!" Sora screamed in fury upon seeing his most important friend being torn away by this despicable old man while charging at him. "WHY HER?!"

Sora tried to land a hit at Xehanort in retaliation for Kairi's death in vain and was sent flying back to the ground.

Everyone else, the King Mickey and the other boy with white-hair, Riku couldn't believe what had just happened, the evil sword master had hurt and killed their precious friend.

"Why?!" Sora spat giving the old man a pissed off glare.

"I made it." Xehanort laughed evilly after fulfilling his most ambitious plan.

"I'M GONNA KILL YOU, XEHANOOORT!" Riku roared in rage charging against the man, only to be countered and knock back to the ground as well.

"You will pay for this, Ultima!" snarled King Mickey furiously while trying to cast the spell.

However, Xehanort managed to interrupt that spell casting Stopza preventing Mickey from successfully casting his magic attack, even though both casts were struggling with each other, Xehanort succeed in using his own and halt everything.

Sora was very distraught as he was watching many of his friends being struck down by the man who successfully fulfilled his threat.

Xehanort had successfully obtained the χ-blade, with that, anyone could acknowledge him as an unstoppable man, capable of everything and no one could face him to stop his plans once and for all.

"The χ-blade is complete." Said Xehanort smiling evilly. "Kingdom Hearts! I call upon your true form. Open now and show me the World to come."

Xehanort covered the whole world in darkness, as Sora watched helplessly without any way to do something to revert the situation.

It was at this moment when his friends and traveling partners Donald and Goofy showed up to try to comfort and cheer him up.

"Hey, don't give up." Donald told him to stand up.

"We thought ya might be able to use a couple a' more half pints." said Goofy the same way.

"Donald… Goofy…" expressed Sora in a grieving tone.

"Typical. You can't do anything without us, Sora." Donald reminded him of how supposedly uncappable he was, giving him strong statements as an attempt to motivate him.

"Now wipe those tears, and let's go stop Master Xehanort!" Goofy asked him to stop crying and pull himself together.

"Yeah… but… he controls Kingdom Hearts now." Sora knew it was impossible to face him at this point. "And Kairi…"

Everything seemed lost when…

"You, worried?" an incoming voice was heard behind the trio.

"Guys." Sora articulated upon seeing people getting closer to them.

People who made it there were Roxas, Axel/Lea, Xion, Aqua, Ventus and Terra.

"Sorry we took so long." Axel apologized for taking so long. "Had a couple of plot points that needed ironing out."

Roxas and Ventus had a brief eye-contact looking at each other with subtle surprise, they looked like twin brothers.

"Master Xehanort…" said Terra visibly bothered about what the old man had done.

"He did it… He opened Kingdom Hearts." Aqua agreed. She felt defeated like everyone else.

"So, what now?" asked Ventus in the same manner.

No one had the answer for that and everybody bowed their heads down in defeat, or that's what they thought.

"We still have one hope." Stated Mickey leading them to believe they still had one chance to resolve the big problem.

"Your majesty! Riku! Are you okay?" asked Sora after looking at them unharmed despite the Xehanort's attack.

"Yeah." The white-haired affirmed him.

"What hope?" Ventus wanted to know the way to defeat Master Xehanort.

"It's Xehanort. During the Mark of Mastery exam, we learned that he can transcend space and time. He's a portal, and we can use that to trap him." Riku explained them how to take him down for good.

"But, it won't be easy. Aqua, Riku, I'll need both of your help if we're gonna push Xehanort out of this world." Mickey gave them instructions to carry out the plan.

"Wait. I'll do it." Sora wasn't willing to sit down and do nothing, he needed take the initiative and defeat the old man himself.

"What?" Riku questioned him upon hearing him say those words.

"Kingdom Hearts is a much bigger threat." Sora explained his motives and asked them to let him carry out the mission. "Let me handle Xehanort, while you guys keep it shut."

Everyone looked amused after hearing Sora's words, Mickey looked sad knowing very well how risky it was to face Xehanort alone, nonetheless they all agreed to do so believing him.

"Okay, Sora." Said Mickey letting him do what he had to do.

"I got this." Answered the brown-haired boy motivated.

With that, Sora walked his way towards Xehanort decided to bring Kairi back along with Donald and Goofy joining him.

"Sora." Xion talked to him to wish him good luck.

"Oh, hey." He greeted her.

"Kairi will be alright, I can feel it." Xion led Sora to believe that she wasn't dead as he thought.

"Thank you." Said Sora looking way more motivated than ever.

With that, everybody used their keyblades' powers to open the portal and Sora, Donald and Goofy transformed into sort of light to get inside the world called 'Scala Ad Caelum', which at its time it was called the Daybreak Town.

/

This world was where the final battle against Xehanort took place and not only on the solid ground but in the ruins of the citadel underwater and even at the tower.

After an agonizing and hardcore fight, Sora, Donald and Goofy finally defeated Xehanort by using a light ray from Sora's keyblade.

After that, Riku and the others made it to the tower to be the witnesses of Master Xehanort's definitive defeat.

Terra walked few steps wanting to execute his supposed teacher who lead him to the evil path long time ago, nobody could blame him to do such action, but…

"Don't do it, Terra." Aqua implored him to stop. "He got what he deserved."

Terra nod at his friend's words, what he really wanted, was to exchange some words with his former master.

"There's more to light than meets the eye." Stated Terra, shocking the old bald man. "As I told you."

"You sly fox…" responded Xehanort amused.

Suddenly, a bright light surrounded Terra and that was the moment when Master Eraqus's soul emerged from Terra's body in front of Aqua and Ventus.

"Now, hand over the χ-blade, Xehanort." Eraqus asked the sword master to give him the said weapon.

"It is too late." Xehanort stated that there was nothing that everyone could do to handle the situation.

"For us, perhaps… but not for them. "Eraqus refuted while looking at Sora and the others, seeing them as the saviors.

"No… I can do this." Xehanort didn't want to admit his defeat, but he already had lost his strength to wield the χ-blade, therefore there was nothing he could do anymore and he had already lost.

"Enough." Said Eraqus making him put the sword down. "Checkmate."

Xehanort had no choice to accept his defeat and handed his χ-blade over to Sora, and then he bided everyone a farewell and went to afterlife with his longtime friend and rival Eraqus.

And this was how the battle against to the darkness came to an end.

Sora and his friends used the sword's power to leave the place and go get back to the Keyblade Graveyard.

But, this wasn't enough for the young keyblade wielder, he felt that he needed to do something to make the things right.

"No…" said Sora in this state.

"We will find Kairi. Let's head back to Master Yen Sid. We can figure it out." Riku tried to cheer him up.

"No, I know what to do." Sora rejected his friend's suggestion.

"Sora…" Mickey looked worried about what he was about to do.

"My whole journey began the day I lost her." Sora explained the big motive of his actions. "And every time I find her… she slips away again. I thought we'd finally be together. But she's out there, alone. Not for one more second."

"We'll go too!"

"That's right!"

"Thank you, Donald, Goofy." Sora thanked them for their will to travel with him, but he made a drastic choice, shocking everyone. "But this time, I have to go it alone."

"Sora, listen. The power of waking isn't to go chase hearts around!" Mickey warned him about the big risk that this entailed. "Even if you do locate Kairi, you might never come home to us again.

"I will. And we'll both be back before you know it." Said Sora looking optimistic despite the warnings the king was giving him.

In order to bring Kairi back and despite of the consequences, Sora was more than ready to face the risk of losing himself, or even worse, disappear from his own existence.

"Let him go, Mickey." Riku asked him to respect his decision.

"But, Riku…"

"His heart and his mind are made up. Now Believe in him."

"Yeah… Safe Journey, Sora." Mickey gave up and wished him good luck.

"Thank you." The boy thanked him for everything.

This was the moment when the young keyblade wielder opened the portal by using the power of waking to go find Kairi wherever she was.

/

After the keyblade war was over, every single one of them shared their happy moments:

-Mickey, Donald and Goofy reunited with Queen Minnie, Daisy and their dog Pluto.

-Aqua, Ventus and Terra frequented Master Eraqus's grave in Land of Departure, now resolute to get stronger.

-Roxas, Axel and Xion were sitting down at the top of the tower in Twilight Town along with Hayner, Olette, Pence and with Isa.

-Naminé, Kairi's nobody, had got her body back after going through different proceedings.

Everyone had lots of fun celebrating their big victory in Destiny's Island.

Kairi was sitting down on a thick trunk, sheering a tear through a cheek by the time she saw how Sora was disappearing from her sight and everyone else's.

"I'm so sorry…" said the girl crying. "I know we will see each other again, maybe one month… three months… someday…"

Little did they know was that the young keyblade Wielder was somewhere else where it wasn't precisely about striking every type of Heartless and dark creatures, but something else.

END OF PROLOGUE.