Invasion Of Two Army's (Mha X Halo Crossover)

Attack On Cairo And U.A.

Just a heads up, this fanfiction will take place a month before the Paranormal Liberation War Arc happened, so expect to read Deku using black whip.

Everyone was at the dorms preparing for school and discussing about internships not being available.
"This is strange, nobody is available to hold an internship or volunteer for mentorship", said Deku.
"They must be busy with something, they've been dealing with something that has to do with... aliens", said Sero confused.
"Please, there are no such thing as aliens", said Bakugo.
"Well that thing that fell from the sky did contain some unknown species", said Kirishima.
Bakugo growled at Kirishima.
"Whoa, whoa, whoa, I was just being honest", said Kirishima.
"That could just be people making things up to get everyone's attention", said Bakugo.
"Actually that thing that leaped on my dad's face seemed pretty real to him", said Todoroki.
"SERIOUSLY, YOU BELIEVE IN ALIENS TOO", yelled Bakugo.
"Okay that's enough, drop the subject and let's just get to school", said Iida.
"Yes sir", said everyone.
Meanwhile, Malta station was destroyed.
"Uh oh, hey, they're leaving the Athens", said a soldier.
Athens station just blew up as well.
"Cortana, assessment", said Hood.
"That explosion came from inside the Athens, same as the Malta, the Covenant must have brought something with them, a bomb", said Cortana.
"Then they sure as hell brought one here, Chief, find it", said Hood.
"Yes sir", said Master Chief.
Chief ran his way to the bomb while shooting covenant.
"Chief, we don't have much time, find that bomb", said Cortana.
"On my way Cortana", said Chief.
Everyone was in class but they had questions.
"Wait, if the heroes are busy with possible alien stuff then why is school in session", asked Asui.
"I have no idea, but principal Nezu said school is still in session so we have to show up", said Iida.
"He's right, be thankful you showed up cause not every pro hero is involved with that ship", said Aizawa walking in.
"Everyone take your seats sensei is in the room", said Iida with his arm ticks.
"You're the only one standing Iida-san", said Aizawa.
"Aw come on why does this happen to me", said Iida sitting down.
Chief exists through the airlock and shot down a couple of elite rangers flying around the vacuum of space.
"Sir, boarders have breached the fire control center, they have a bomb", said Cortana.
"Can you defuse it", asked Hood.
"Yes, but I'll need the Chief's help to make contact with the detonator", answered Cortana.
"Chief, get to the bomb, double time, Cortana, prioritize targets and fire at will", said Hood.
Chief entered back inside through another door and made his way to the bomb.
"Just so you know, there are quite a few Elites guarding the bomb, you may need to get creative", said Cortana.
Master Chief threw a grenade in the room damaging all of the elites and grunts.
Then he shot them all down and found Cortana and the bomb.
"Me, inside your head now".
Master Chief touches the pedestal, and Cortana downloads directly into his armor.
He steps over to the bomb, and touches the flashing red activation pad at its center.
It blinks and turns blue.
"How much time was left", asked Master Chief.
"You don't want to know", answered Cortana.
"Cairo, this is In Amber Clad, the carrier's shield is down, I'm in position and ready for immediate assault", said Keyes.
"Negative Commander, not against a ship that size, not on your own", said Hood.
"Sir...... permission to leave the station", said Master Chief.
"For what purpose Master Chief", asked Hood.
"To give the Covenant back their bomb", answered Master Chief.
"Permission granted", said Hood.
Chief grabbed and dragged the bomb into an elevator and rises.
"Chief, I know what you're thinking, and it's crazy", said Cortana.
"So, stay here", said Master Chief.
"Unfortunately for us both... I like crazy", said Cortana.
The elevator reaches an empty Longsword launch bay, and Chief steps out, watching through the huge bay door.
The entire fleet streams down toward Earth, chasing the Covenant ships. Chief then steps up to the door's release handle, which drops down above him.
"Just one question, what if you miss", asked Cortana.
"I won't", answered Master Chief.
Chief pulls down the handle and the bay doors cycle open, the bay decompressing rapidly.
Debris lifts off the floor and hurtles into space, and the bomb slowly begins to slide toward the doors, scratching sparks across the floor. Chief grabs hold of it as it passes, and is pulled out into space.
A pair of Longsword fighters dive past him, and make a strafing run on the carrier.
They open fire on the Carrier, and make a staccato beat of fire along the back of the carrier, allowing Chief to slip through the narrow hole the blasts have created.
As he entered the Carrier's center , he crawls up the bomb, presses its activation panel, and spins around. His legs flex, and he vaults off the bomb, aiming for the split in the carrier's armor.
He escapes the carrier straight for earth as it blew up into a huge plasma conflagration.
As he was falling towards Africa, UNSC Frigate passes beneath him, causing him to land on top of it.
"For a brick.....he flew pretty good", said Johnson.
"Chief, get inside, gear up, we're taking this fight to the surface", said Keyes.
Keyes flew the ship towards Africa.
But another ship flew towards Japan.
"Armatenant, where are you going", asked Hood.
"There's possibly a flood outbreak in Japan, I'm sending my fleet there instead", answered Armatenant.
"Permission to land", said Hood.
It was lunch period at U.A. and everyone was sitting together.
"Everything just feels so weird today, I know school was normal but I feel like everything is unusual, could it be something to do with the aliens", asked Deku.
"Probably an alien effect, I feel it to, today does feel unusual dispite how normal the whole day was for us", said Uraraka.
"Yeah me too", said Iida.
"I hear something, like multiple people coming this way", said Jirou.
"Maybe it's because the day was too normal", said Tokoyami.
"Or it could be that weird looking guy over there", said Todoroki pointing to a parasitic creature.
Everyone turned around and saw the creature in the middle of the room.
"Wait".
"I don't think that's a person", said Kaminari freaked out.
More of the creature broke in trough the wall and the alarms sound.
"Guys we have an invasion in the cafeteria", said Lunch Rush.
All the kids in hero training were fighting off the creatures.
"How did they get pass security", asked Shoji.
"I knew I heard something, these guys a large army, big enough to make their way in", said Jirou.
"Army of what", asked Hagakure.
"Probably those aliens everyone was talking about, not sure", answered Jirou.
"They look like the ones my dad and Hawks were facing, they probably expanded", said Todoroki.
Todoroki knocked one on a wall and more kept coming.
"There's too many of them, we may have to retreat", said Kirishima.
"YOU HAVE MANLY INTENTIONS AND YOU WANT TO RUN AWAY FROM PUNY LITTLE CREATURES, I DON'T THINK SO", yelled Bakugo.
Bakugo blasted some of them.
Sero saw a couple of the creatures form onto something bigger and different looking.
"Uhh guys, these things are doing something, and I don't like it", said Sero.
The new form started blasting spike projects.
"Watch out they have blasters"!
A couple of students used tables to shield themselves.
The teachers finally made it with more of the parasitic creatures following them.
"Sensei", said Iida.
"Is everyone okay", asked Aizawa.
"Yes but more keep coming and their changing into different forms and trying to feed on us", answered Iida.
"They go down easy but they keep growing and reproducing again and again", said Deku.
Todoroki blocked a spike projectile with his ice and burned several of the other with fire instantly killing them.
A couple dropped on him trying to bite his neck but failed something knocked them off.
"I would recommend a full retreat, these guys are tougher then look, even for your abilities", said a voice.
An armadillo looking army man stood at the door with his group.
"Names Armatenant, member of the UNSC, this way we'll lead you out of here".
"NO WAY, WE'RE GOING TO STAY AND FIGHT", yelled Bakugo.
A much bigger version of the creature just formed and Bakugo landed an attack on it.
The giant creature took damage from the explosions but not enough to take it down.
It took Bakugo four attacks to fully take it down.
More new formations keep spawning.
"You took down one giant flood but more will come, trust us you have to retreat", said Armatenant.
"These guys are parasites", said a marine.
"Yeah we noticed, this way everyone, we'll have to fight these creatures on our way out", said Aizawa.
"Yes sir", said everyone.
Everyone continued to fight the flood while also finding their way out.
Deku used full cowl 20 % of one for all to kick most of his enemies out of the way, even the big ones were down.
For some reason, a video take of class 1A fighting the flood showed up in Cairo station.
"Sir, there's a take from Earth showing on one of our monitors, it looks like there's a couple of kids fighting the flood", said an officer.
"This is coming from a hero school for all I know", said another officer.
"I think that's U.A. high", said another officer.
"They are taking out a lot, but any hero school could do the same, most of our soldiers have quirks too, some even powerful ones, and we all know Master Chief is a skilled warrior dispite being quirkless", said Hood.
"But look at them go, not a single one has been infected yet", said an officer.
"If every single student makes it out alive, then I might be impressed", said Hood.
Everyone saw a huge group of flood blocking the exit.
The marines started shooting their battle rifles.
"Jonny, you have your flame thrower right", said Armatenant.
"Uhhhhh, I kinda forgot it", said Jonny.
"Again Jonny, every time we're in a stressful situation you always forget something important", yelled a marine.
"Move I got this", said Todoroki stepping in front.
Todoroki used his fire to burn the flood out of the way.
They instantly drop.
"Who needs a flamethrower if we have fire boy", said a marine.
"I also have ice", said Todoroki.
"Oh cool", said the same marine.
"Holy crap these things climb walls", said Kaminari.
"Yes we know that, move your ass", said Armatenant.
"For the record, I stick to walls too", said Asui.
"Oh yeah that's right", said Kaminari.
Everyone finally ran outside only to see a large army of flood.
"There's even more outside", said Iida.
"Come on these guys are like cockroaches, they grow into more and climb walls", said Kaminari.
"That's why we needed you guys out of here as fast as possible", said Armatenant.
Armatenant and the marines threw some grenades at the flood blowing some of them up.
"Come on we gotta help", said Kirishima.
Deku used Air Force.
Bakugo uses Howitzer Impact.
Uraraka uses Meteor Storm with the ground bits everyone has created.
Iida zips around taking out a bunch of flood.
Todoroki freezes them then uses flashfreeze heatwave.
"They cleared a path for us, go go go", yelled a marine.
Everyone ran through the open area and escaped.
Nobody has been infected.
Everyone at U.A. was retreated to a rescue center.
"Yes Lord Hood, not a single student or teacher was infected, everyone is out and brought to a rescue center", said Armatenant in a communicator.
"Okay armadillo man, can you just tell us WHAT THE HELL IS GOING ON", yelled Bakugo.
"You were attacked by the flood, before you ask, they are a parasitic lifeform that grows and reproduce on dead or living bodies, once you are infected, you turn into them, and they can use your quirk even after you're infected, they've took some of our men before and were capable of holding weapons, that's what's so scary about them, you may have powerful quirks but that doesn't completely stop the spread of them", said Armatenant.
"Yikes, that actually sounds even scarier than nomu", said All Might.
"You should hear their war against the Forerunners, anyway the head of the UNSC wants to talk to you at the Cairo station, you guys better join us in our ship", said Armatenant.
"Okay sure", said Deku.
"I wonder what he wants us for", asked Iida.
"Not sure, but it might be serious", said Aizawa.