Hello everyone, my name is Gordita20, and today I'm here to bring all of you lovely people something I've been planning on writing for like…..2-3 days ago lol. But just to quickly sum this story up, it's a What If the world of Fire Emblem Three Houses gets merged with the lovely universe of the famous My Hero Academia's verse. Now I will explain more of this idea at the end of the prologue. So please enjoy this chapter!

2086….Eastern Fódlan

Nemesis, the failed experiment of attempting to make an All For One from scratch, has been revived and his first act of being reborn is to kill Seiros who is currently residing in Garreg Mach Academy. And then find the current users of All For One and One For Al and take their powers so he can finally be complete.

"Seiros...must...die…" The beast growled out as he march with his small army of Nomus thanks to the remaining members of TWSTD (Those Who Slither in The Dark) as also a battle that has been going on for a while since his return with the combined force of the Empire, the Kingdom, the Alliance, and The Church of Seiros.

From a high rock from the distance a boy wearing his trademark mercenary armor jumps high and he gave a mighty yell as he uses a point blank energy blast that he was able to copy from his youngest student. This boy's name is Byreth Eisner. A boom happens and in the gust of wind Byreth gets blown backwards from Nemesis' shield he manifested thanks to his quirk.

"So she gave that quirk to you?" Nemesis spoke as he stood there unfazed from Byreth's attack.

Byreth was one one knee and he looks up to Nemesis with a deadly glare. "Yes she did, and you should have hit me harder." He insulted him.

From the distance Edelgard is looking through a pair of binoculars. "Byreth? I thought he was resting?!" She spoke with a hint of anger and unaware of Byleth Eisner, the twin sister of Byreth, passing by her.

"Teach wait!" Claude tried to stop her but he was too late.

"Handle the Nomus! Make sure they do not reach the city!" Byleth shouts back to them as she runs to assist her brother.

Dimitri joins his friends and the three just watches as Byleth ran. "Please be safe Professor." Dimitri whispers to himself.

Byleth was dodging and weaving through the battlefield. "We won't stop now..." She mentally told herself as she activates One For All at 30% "...We have to end this now….."

"...If we can't stop this guy..." Byreth was just in the air using a flight quirk while firing some fireballs at the walking Nemesis who's just walking through them with his manifested shield in front of him.

"...We can't call ourselves Heroes!" Byleth uses her quirk to launch herself up in the air before she uses it again to launch herself towards Nemesis flying past Byreth and she does a flip with her left foot ready to dive kick Nemesis. "Black Eagles….." The foot slams against the shield with lightning and wind clashed together. "...SMASH!" Nemesis just stands there holding up his shield against Byleth's smash.

"I know that my smash won't go through, I just need him to use his quirk!" Byleth thought to herself before Nemesis has enough before he launches her backwards towards her twin brother.

Byreth was able to catch Byleth by her hand with his right hand midair. He quickly uses his left hand to fire a power wind blast at an angle so he can spin the two vertically in a fast way. "Divine Catapult!" Byreth yells as he flings Byleth forward.

Byleth has her right fist pulled back quickly charging another smash. "Ruptured Heavens….." She throws the forward to collide with Nemsis' shield. "...SMASH!"

The attack landed causing another shockwave to happen, sending Byleth backwards but she quickly lands on the ground on her feet and her brother joins beside her as he softly lands and deactivates his flight quirk.

The dust clears and Nemesis emerges from his sphere shield. "Not a bad effort from the One For All and the All For One users."

"We're not done quite yet!" Byleth proclaims

"We're here to kill you once and for all!" Byreth also proclaims as well.

End of Prologue

I really hope all of you enjoyed that prologue. And I know that I promised to have an explanation but I just thought of a better idea...what if we have our cute child of a goddess explain this story. But alas that'll have to happen until my next chapter! If you're on please favorite and follow and leave comments and if you are on AO3 please do the same and send me kudos! All that is really appreciative! I love you guys and I'll see you in the next chapter, Peace!