A/N:here is the final part of the special chapter hope you will enjoy it.
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(Previously)

Cleveland: were did Big Brother go?

She got her answer when Y/N appeared besides Enterprise as they saw him put his sword back into its sheath.

Yorktown: what did you do big brother?

She got her answer when the high-class Sirens fall into pieces.

Everyone: Naniii!
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(Continuation)

Everyone jaws were wide open as they were utterly dumbfounded of what just currently happened infront of them.

Y/N:if you all continue to open your mouths it will freeze.

Y/N said as he fired a beam of black light particle towards a group of production model ships.

As they were all broke out of there trance and look towards Y/N.

Montpelier: that was awesome how did you do that big brother?

Montpelier asked as there were stars could be seen in her eyes.

Cleveland:how did you do that big brother?

Y/N:call it an ability of mine that grants me to move very fast.

Denver:cool can you also give me one to?

Y/N:maybe after this battle I could put on your new retrofit.

Y/N said as he fired another salvo towards a high-class Sirens before launching B-2 bombers.

The others began to return attack as they continue to fight against the Sirens.

Denver:hey Cleveland enemy incoming in your left.

Denver said as she kicked a high-class siren before vaporizing it.

Cleveland:got it.

Cleveland said as she turned around and fired a salvo destroying a group of 55 high-class sirens.

A high-class Sirens was about to shoot Columbia when the Siren was kick by a foot sending it flying straight into an Iceberg.

Columbia: thanks Denver!

Columbia said as she back flip dodging a pair of torpedoes from her right and left side as it instead hit each other.

Columbia the fired a salvo on both side hitting high-class sirens as they got vaporized.

Meanwhile with Enterprise we could see her riding on a Cosmo Lancer as she fired a volley of Blue arrow towards a group of 800 Siren ships.

Enterprise: big sis Yorktown enemy fighters are heading towards you.

Enterprise shouted before firing another volley of blue arrows that transformed into X-33 fighter jets.

The fighter then went towards a group of Bombers as it unleash a storm of bullets that shred the Bombers to pieces.

Yorktown:thanks Enterprise.

Yorktown said as she launch multiple Cosmo Lancers.

The Bombers went straight to the said enemy bombing them pieces.

Laffey could be seen with Ayanami as both dodge an incoming missile before firing beams of blue light particle.

And vaporizing a high-class siren as Ayanami jump on a carrier and sliced it with her sword.

Y/N then noticed a huge beam of black heading towards the remaining massive group of Sirens.

Y/N:everyone brace yourself.

Y/N said as she float above the other noticed the black beam as all of them float above.

The beam then went straight towards the iceberg causing a massive explosion that produce a huge shockwave.

Everyone hold to anyone near them to prevent themselves from getting separated from the others.

While Enterprise we could see her holding on to Y/N left hand.

When the shockwave was gone everyone look to see were the massive beam of black energy has went.

Cleveland:are they all gone?

Cleveland asked as she came out of an Iceberg along with Denver.

Helena:I am not detecting any signs of any Sirens on the radar.

Helena said as she lands back down into the water.

Y/N:perhaps but there are still more inside there.

Y/N said as he pointed towards were the entrance is which is covered in smoke.

Javelin: Lord Y/N!

Y/N:Javelin status report and for how many time have I told you to stop calling me Lord.

Javelin: y-yes big brother.

Javelin said with a small blush on her cheeks.

Aether:Y/N there are nothing we could detect inside.

Denver:have all of them been obliterated?

Denver asked but Y/N shooked his head.

Y/N:no there are still some left and it's inside there.

Helena: but we aren't picking up anything on the radar.

Y/N:perhaps not, but there must be a portal.

Hornet:wait don't tell me were going into another Mirror World.

Y/N:I am afraid so.

Yorktown: what Should we do?

Y/N:gather up everyone were going in.

Y/N said as he contacted the commander.

Alice:Y/N how is everyone there?

Y/N:everyone is fine the Sirens fleet have been destroyed but we are going to head inside there base.

Alice: becareful it might be dangerous inside.

Alice said in a worried tone.

Y/N:oh don't worry so much it's not like I haven't done this before.

Alice: you still joke around even though were in a battle.

Alice said with an annoyed face as Y/N just chuckle at her expression.

Y/N:you know your quite cute when you make that face.

Alice: w-what i-im not.

Alice said with a blush on her face as this didn't get unnoticed by Y/N.

Y/N:but you face is blushing.

Alice: just shut up!!!

Alice shouted before cutting off as Y/N chuckled at this.

Enterprise: big brother everyone is prepared.

Y/N:good, tell everyone will head inside now.

Enterprise:yes big brother.

Enterprise nodded as Y/N looked towards the giant iceberg that the Royal Navy made a hole on.

Y/N:something tell me there is something wrong.

Y/N muttered to himself before he went to the others.

(Y/N POV)

I desummoned my riggings as it transform into its ships form.

The fleet has only sustained some scratches and added the fact that we were in a cold place.

You could see some of them shiver from the cold luckily the were wearing some winter coats so they won't get cold.

I looked towards the others as they are all resting for a bit.

I could detect a mirror world within there and whatever it is I don't think it won't be an easy fight.

Enterprise:are you okay big brother?

Enterprise asked as she appeared behind me.

Y/N:don't worry I am fine Enterprise.

I reassured her.

Enterprise:ok but if anything goes wrong don't hesitate to ask our help big brother.

Enterprise said as she kiss me in the lips as I just kiss her back we seperated after a few seconds.

Y/N:and how many times I told you and your sisters just call me by my name.

Enterprise:*giggle* but it's fun calling you that.

Y/N:*sigh* yeah whatever.

And yeah you all be surprised well I am kinda married to her now along with Yorktown and Hornet.

It was a week after the defeat of Sakura Empire that we 4 got married.

Anyways Hornet and Yorktown landed on my ship as they walk towards me along with the others.

Yorktown: big brother we are all ready now.

Y/N:good everyone activate your Nova and Klein field.

Everyone nodded as 2 various colored barriers cover them.

And I could see the commander and the fleet a few hundred meters away.

I then made my ship move at 32 knots for the others to catch up.

Y/N:Infinite prepare bombardment cannons.

I said to the ship that is orbiting above earth.

(3rd POV)

Above the planet the Infinite broadside opened and revealing 15 Super Gravity Cannons that has a length of 35 meters all aimed on the mirror world.

And several ships that are with the Infinite opened there broadsides and aimed there Super Gravity Cannon.

Meanwhile back at Y/N and the others we could see them entering the gates made of ice.

As everything was silent only the sounds of ships breaking small pieces of ice they past through.

Hamman:everything is really quite and I don't like.

Hamman said as she ready her cannons in case of something happens.

Repulse:does anyone knows what awaits us inside there.

Prince of Wales: we don't know but everyone stay vigilant.

As they continue to pass through the icy canyon it wasn't long when they see an exit.

Hornet:hey everyone look an exit.

Hornet said as she was about to pass through it when she felt a hand holding her left hand.

She turned around and look to see Y/N the one holding her hand.

Hornet:big brother what is it?

Y/N:don't go near it.

Hornet:why?

Y/N then throws a small ice towards the exit as the ice makes contact it suddenly got obliterated.

Hornet:wait what just?!

Y/N:it's a trap everyone open fire!

Y/N said as all ship fired on the exit as the exit suddenly exploded before it change as it revealed a portal gate.

Javelin: woah didn't see that coming.

Javelin said as she was surprised a bit.

Laffey: are we going in?

Y/N:yes make sure that your Nova and Klein field are activated.

All nodded as they check there field which are all still online.

They then went through the portal as a blinding light surrounding them making them cover there eyes.

After a few seconds the lights died down revealing themselves inside a mirror world however this one's different.

Cleveland:what in the world is that?!

Cleveland asked as she looked at a giant fortress floating a few kilometers away from them.

Denver:that thing is huge.

Javelin: what even is that?

Y/N then noticed it glowing as his eyes widen.

Y/N:everybody dodge!!

Y/N said as he jump to the side as everyone noticed a light heading towards them.

The girls mannage to dodge the incoming beam as pass through them and exploded on an Iceberg.

Causing a huge explosion that produced a massive shockwave that blew the others away.

Javelin:Aaaaaahhhh!!!

Laffey:Javelin hold on!

Laffey said as she grab hold of Javelin and grab hold to a nearby rock.

Just then they heard someone spoke.

????:welcome Azur Lane.

All of them looked up to see a man floating above them.

Hornet: wait who are you?

Hornet asked.

????:a lowly being like you doesn't need to know who I am.

This made the girls angry as they aim there cannons towards the man.

Y/N frown at this as he scanned the man as his eyes widen right infront of him was the Creator of the Sirens.

Y/N:I'm surprise that the Creator of the Sirens is here.

Y/N said attracting the Siren Creator attention as he turned around and look at Y/N.

Siren Creator:who are you how do you know me?!

The Siren Creator demanded but Y/N didn't answered him as he slowly made his ships cannons aim towards the Siren Creator.

Siren Creator: Answer me!

Y/N:you want answer how about this then.

Several beam went straight towards the Siren Creator as he screamed in pain as he looked at Y/N in hatred before opening a portal.

Siren Creator:how dare you Tester deal with this pest and as for you I will come back for you mark my wor-.

He was cut off by a missile hitting him as it sent him straight flying to the portal before it closed.

The girls were shock to see that the man they just met was the Creator of the Sirens.

Denver: hahaha that guy got beat by big brother easily.

Denver said as she laugh at what Y/N did to the Siren Creator as the others also laugh at this.

But they all soon stop laughing when 20,000 high-class Sirens appeared along with Tester who is above the fortress.

Y/N:everyone you all handle the high-class Sirens I'll will handle Tester.

Y/N said as he summoned his riggings before he jump on a plane he summoned as he went toward the fortress.

Enterprise: Big Brother wait!

Enterprise said as she followed behind while with the others.

Cleveland: let's rip and tear them to pieces.

Cleveland said as she crack her knuckles before firing corrosive torpedoes on 500 Sirens that were about to fired on her.

Denver:yeah.

Denver said as she jumps above then used her new special weapon the Super Gravity Cannon.

The water below split in a half sphere as 4 mirror ring fields appeared surrounding Denver.

Denver: fire!

Denver said as she fired a black beam of particle towards a huge number of sirens as it hits it's target it exploded like an atomic bomb used in Nagasaki.

Hornet: hey Denver how did you do that?!

Hornet said as she bombed several high-class Sirens that were trying to run away.

Denver:just say Super Gravity Cannon active.

Hornet nodded as she did what Denver said as 4 cannons appear behind her that is 3 meters long and 12 mirror ring field appeared and surrounded her.

Meanwhile with Y/N he landed on the fortress as the fortress defenses open fired on him.

But all are being repelled back as Y/N launch some Cosmo Lancers that destroyed the defenses.

He then dodge a beam that was about to hit him in the head.

He looked to his right and see Tester herself.

Y/N:it has been a while Tester Beta.

Y/N said as he dodge a missile fired by Tester.

Then fired a beam on Tester damaging one of her cannons.

As she lunge towards Y/N and tried to punch him but was blocked by Y/N sword.

Y/N:how long will you and your Creator will continue to attack humanity?

Y/N ask as he fired a missile on Tester who mannage to dodge it.

As Y/N sliced a bomb that was about to fall on him.

Y/N:many lives have already died because of you and your Creator why can't you just surrender.

Y/N said as he appeared infront of Tester and punch her in the stomach.

Sending her straight to a wall as the impact destroyed half her riggings.

Tester then mumbled something that Y/N didn't hear.

Y/N:what did you say?

Y/N said as he walk towards Tester.

Tester:P-p-please s-save m-me.

Tester said as Y/N suddenly got confuse at this but then he noticed her crying in tears.

As he step forward and touch Tester memories entered Y/N mind and showed everything about Tester.

He saw her being created by there Creator at first they were not willing to follow there Creator due to how he mistreat and abuse them but a collar was put on there necks forcing them to obey.

He saw Tester being forced to kill Trillion if not Quadrillion of lives through out her life.

And there Creator using them as tools to amuse him.

Seeing this made Y/N very angry that it could make hell itself freeze to absolute zero.

Y/N:this doesn't make any sense that's the reason you invaded humanity.

Y/N said as he look at Tester who was now unconscious

Y/N:you have been carrying this guilt for that long now.

Y/N said as he picked up Tester and walk towards the railings of the fortress.

Enterprise suddenly appeared as she lands on near Y/N.

Enterprise: big brother your okay?

Enterprise asked then she noticed Tester who is being carried by Y/N.

Y/N:yes I am fine Enterprise.

Enterprise:what are we going to do with her?

Y/N:she is an ally of ours.

This shocked Enterprise.

Enterprise: but she's a Siren!

Y/N:yes she is a siren but she is not our true enemy for our real enemy is there Creator.

Timeskip

The battle was won and everyone can't wait to return back to base but some where confuse as to why they are bringing a Siren.

The Siren fortress was destroyed by the Super Gravity Cannon from the fleet above.

Meanwhile with Y/N and the commander we could see them inside the Infirmary as several nano-drones that were healing Tester.

Alice:are you sure that it is true on what you saw on her memories?

Y/N:I am not wrong commander, what I saw is a girl that has been tormented by her own maker for her whole life.

Y/N said as she look towards Tester who is still unconscious and seem to be sleeping well for her first time.

And luckily the collar that was on her neck has now been removed.

Y/N:and I'm going to free the rest of her kind no matter what it takes commander.

Y/N said as we could the flames of vengeance racing within his eyes.

Y/N:we have a new enemy to face.

Alice:and who might that be?

Y/N:there Creator.

To Be Continued.
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A/N:that is the end of the special chapter and the voting has now ended the next special chapter will be Y/N and some of the girls will be sended to another world that is all and hope you all have a nice day Author Out.