>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

{POV: Matsuzaka Satou}

Timeline: About the same time Kyoto got attacked, somewhere close to the island. (Yes, Aqua Eden was attacked a bit later).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

*RING*

...I have waited for this moment for years.

Today Azazel would get killed if the plan really worked out.

Me and Onii-chan are finally free from Azazel control from all this year.

After waiting for a while, a dark portal appeared in front of me, and a masked white-haired girl come from it. The dark portal closes, and the girl stares at me while giving me a smile.

...!!

For some reason, I never really like this girl.

"Hello, Miss Knife, sorry for the late visit." The masked girl said with an apologetic tone.

"No problem. It is really today, Isn't it?" I asked her.

The masked girl responded "Yes, with your troublesome plan I don't think it would be hard to kill Azazel."

I nodded toward her.

I don't care how they kill Azazel as long they didn't tell anyone about my involvement, that is why I give them a plan which could work even if Onii-chan was with him in Kyoto.

Azazel needs to be killed, or someday Azazel will tell him my true nature and Onii-chan will be disappointed with me.

I don't want to be hated by Onii-chan.

Azazel knows too much, as he also knows Onii-chan's biggest secret. Onii-chan in other believes him too much, never realizes that Azazel isn't a good person.

"I still can't believe it you rather kill your own father rather let your brother know your true nature... well that's work for us, at least." The masked girl said to me.

"...There is nothing more important than my brother." I replied calmly.

I don't care your opinion either, masked girl.

Yes, As long my brother still loves me.

"You are really selfish and childish." The masked girl replied as she shook her head.

She might be right, but I don't care.

I'm too afraid if Onii-chan happens to hate me.

I would rather watch the world burn than letting Onii-chan hate me.

"Well, Our meeting ends here. The contract will be fulfilled after this so perhaps it will be also our last cooperation. Do you have any more questions? " Masked girl said as she does a shrug pose.

...

"About Kokabiel, what is that guy doing? Why he is gathered so much attention?" I asked her.

"Ah about that guy? he does his stuff without any command from Enosh-sama, Miss Knife. Though Enosh-sama decide to let him be since his action would give us more info. It is also somewhat beneficial for us anyway." The masked girl replied then she open the dark portal, indicated that she is about to leave.

...

"Don't blame me for killing him if he dares to step on this island. I need to keep my identity here." I said to her.

The masker girl then chuckled after hearing my words.

"We know it. On that island, there's very old vampire that even Enosh-sama is wary against her. If Kokabiel really did that, Do whatever you like. He won't survive anyway. Only when we are fully prepared that we finally could attack that place." The masked girl replied as she point toward the direction of Aqua Eden.

...?!

"...So Khaos Brigade actually had planned to attack this island" I said to her.

I can see the masked girl smiling face, I bet she probably anticipate it.

"You are really smart, aren't you? Of course, it is. But the future plan is Enosh-sama will personally come here. He said that old witch is too strong for us to go against." The masked girl explain to me.

"...That entity is not wrong." I muttered.

"Anyway, time to go. Good luck." The masked girl said then she leap toward the dark portal, which is in few seconds later ceased to exist.

...

Okay, time to move to central as planned.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Info dump a bit

(Because I don't think most of reader play eroge Dracu-Riot, and I also custom the lore a bit with Kyuuketsuki no Libra, make it somewhat bit OOC history.)

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Aqua Eden is a special administrative area in Japan, located on an island separated from japan mainland only connected by a bridge. It has a good amount of recreational facilities from five-star hotels, resorts, and casinos within the island. Within this island, gambling and the sex industry are legal.

Due to this, Aqua Eden is also well known as Las Vegas of Japan and one of the most tourist destination targets in the world due to its great popularity.

On another side, the history of Aqua Eden can be traced back 400 years ago when Japan was still in the Edo period. The founder and mayor of Aqua Eden, Aragami Sayo compromised with the government at that time and create their own island also with the help of 3 progenitor vampire households.

Embroche. Pumila. Officinalis.

Iris was at that time particularly fond of the idea of creating your own race land that separated from the mainland. She never believes harmony relationships between races, unlike Embroche.

And so that's the short explained history about Aqua Eden island. It was known as a normal island filled with tourist attractions for the normal human populace, especially young men.

Also for people who know supernatural, it was known as vampire land. In fact, the rules there stated every vampire must work because the island cant self sustains itself without a tourism visit. So every business establishment owner and the worker there is mostly are vampires.

...

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

{3rd POV}

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Satou enters the Aqua Eden central tower through magic teleportation, which is where usually her sensei reside. The moment she enter the highest floor of this tower, a red mist manifested in front of her coming with a voice.

"...Oh you have come to visit this island again, my apprentice?" (???)

...

A blonde loli twin-tailed girl appeared in front of Satou from the red mist. She looking at Satou with a smile seems happy that she got a visit from her apprentice. She holds a glass of blood wine, showing that she currently just enjoying herself.

Satou immediately slightly bowed herself to her for showing respect.

Iris Pumila, hailed as the strongest vampire in the world. She is the sole reason why vampire even has their own special island within the human world in this modern era.

"Sorry for the intrusion sensei, but the fallen angel faction send me to inform you and assist Aqua Eden at the same time from a potential attacker." Satou said after bowing to Iris.

"Assist? Hmmph. You understand better than everyone else that I don't need any assist right?" Iris replied with her usual arrogant tone then sip on her wine again.

"Last night, all Rubina exorcist betrayed heaven faction and join with a traitor of fallen, Kokabiel. We are afraid that those exorcists would come here full forces later so I'm here to warn sensei and Sayo-san." Satou explains to Iris.

*Sigh*

Hear what Satou just said, Iris sighed as she understand the situation now.

"If it's that group of pest... It might be really possible. Believe me, I have tired dealing with all of them for hundred years. Even though they actually had a good purpose when Aconite the first Embroche create that organization." Iris said with a tired tone.

...Satou is confused of what her sensei talking about. 

...Vampire hunter organization was created by one of three progenitor vampires?

"It was created by one of the progenitor vampires?" Satou asked.

"Of course it is. Aconite has an agreement with God of the bible in the past, well the death god. They decide to cooperate. The organization was created to punish bad vampires and create a harmonious relationship between vampires and humans. Well, that's a pipe dream, and look now how it has become." Iris explains to her apprentice.

"..That's really far from their current goal and ambitions." Satou replied as she follow the explanation of her teacher.

"Right? That's why I decide to move out of Europa. They keep harassing me right there. Every goddamn single week for hundred years."

*Sip*

"Anyway, why you are here again, my apprentice?" Iris asked.

"...I'm here to offer support from fallen angel faction, sensei." Satou replied with a tired tone.

"Ah yeah, sorry. Let me enjoy my drink, then after this, we will inform Sayo and her council." Iris said with an apologetic tone.

...

Ah yes, Iris is also forgetful. Probably effect being too old. She is over two thousand years old after all.

...

...

Never remind Iris of her age though, she would love to make a pancake of you.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

{3rd POV}

Timeline: A hour after Satou meet Iris.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

A big luxury ship is currently on it is way moving toward Aqua Eden island. But it is not filled with tourists, but Rubina Exorcist who specialized as a Vampire hunter.

"Ah the wretched vampire island, rejoice everyone! This is the first step of glory! And free humanity!" One of the exorcist leaders yelled out as they spot Aqua Eden.

"Ooooohh!!!" All the exorcist also followed their leader to show their enthusiast.

In the midst of a happy celebration, a red mist appeared above the ship instantly.

!!!!

"Konnichiwa, everyone." (???)

And as everyone expected, it was Iris who is greeting them. She is floating in the sky, looking down at then.

The situation on the ship suddenly gets tense as everyone on the ship is aware the girl above them is powerful.

"Blonde loli twin-tailed vampire... Are you the famous rumored strongest vampire?!" One of the exorcist leaders exclaimed.

"Ahh? someone knows me. I'm honored." Iris replied.

"Of course we know your existence, you are the one highest target that we need to eliminate in this world since the 11th century." The exorcist leader calmly said.

"You know it is rude to talk about the age of ladies right?" Iris stares sharply at them.

"Hah! Lady! More like loliba--" 

*BAMM*

...!!

*shake*

Iris waves her hand, and the exorcist who just cut her talk has become a stain on the ship wall. It is easy for her to do that. 

Iris's ability over blood, magic, and domain is well known in the supernatural world.

"Hmph... I will warn everyone here, stop your advance, or I will force to sink everyone down here." Iris declared as she looking down to them.

"Hah- we are numbered hundred here. As If you can--"

*Splat*

...!!

*shake*

Another exorcist becomes a stain on the wall.

"Still trying? I could sink this whole ship in second."

...!!!

No one replied to her, instead they just looking at her.

???

Iris was expecting them to beg for their life or attack her, but what she saw they are actually just smiling toward her, making her feel confused.

...??

*DUARRR* *BOOM* *BOOM*

!!!!!!!

!!!!

!!

*shake*

The sounds of big explosions can be heard through the entire island and cause mini earthquakes. 

When Iris looked at the source of the explosion, she founds it was coming from the bridge that connected the island to the mainland.

One part of the bridge was destroyed and collapsed because of an explosion.

"...The bridge!!" Iris said as she gasped. 

...

A cheer suddenly coming out from the exorcist group.

"Yeah!!"

"Eat that shitty vampire land!"

"Hah! Our purpose here is to lure you out, and in meantime we--"

...!!

*DUARRR*

!!!!!!!

....

Iris decides she had enough and immediately blown the entire ship, killing all of the exorcist inside and sinks it down to the sea.

Iris take out her smartphone to call the mayor, Aragami Sayo but failed. Her smartphone has no signal on it.

"..."

Iris then decide to teleport to them directly through magic but found it's also failed.

"...Shit, We have been tricked. They are really prepared." Iris muttered.

She could technically tear the space out force herself to teleport but it would waste her energy, especially when it is still daytime.

She decides to go through the normal way, floating back to the island.

...

Well, until she saw a platoon full of the fallen angels going on their way to the island and she decide to intercept them.

>>>>>

In the Aqua Eden governing office, currently, everyone was discussing a potential attack by Stray Exorcist but then...

*DUARRR* *BOOM* *BOOM*

!!!!!!

*shake*

...Their meeting was halted due to sudden sounds of a loud explosion.

"Explosion?! Check out the CCTV right now!" Anne yelled out.

One of the council members immediately looking toward their security camera and her expression changed to grim.

"...Anne-sama. The explosion coming from the bridge!! The bridge to the mainland was destroyed!" One of her staff replied.

Everyone was shocked at the new information.

!!!

*BAMM*

"What is the security task force in that area doing to let the most important bridge on this island exploded? Damn it!" Hyouma, the chief of the security task force exclaimed.

Everyone currently feels panic and confused about what is currently going on.

"Quiet, everyone. It is not time to be confused.

...It seems your prediction is correct, Satou-kun." Aragami Sayo, The major of Aqua Eden said as she look at Satou.

"What we should do, Sayo-sama?" Anne, her vice president asked.

"We fight. It is not the first time this island has been attacked in hundred years. 

Hyouma, gather all security task forces and tell them to focus on evacuating civilians to the shelter. However, For people who decide to fight... let them be. We need all help we need to fight back if what Satou and Iris-san predicted was true. 

The rest of the members, let's fight on the frontline. As a leader, we need to show ourselves what we are capable of" Sayo explains to all his council members.

"""Roger, Sayo-sama!!""" All the members inside the room answered her.

"How about Iris-sama, Sayo-sama?" One of her council members asked.

"...I can't reach her. It seems the whole island communication line has been blocked." Sayo replied as she shook her head.

"Sayo-sama, please let me recover the communication line. I will activate our emergency line." One of the council members, Motoki replied as he stand from his chair.

"Thanks, Motoki-kun. I will leave it to you."

...Sayo stand up from her chair and everyone also followed her.

"The others come with me except Anne. You will be here with one of the council members here to guard this building and effectively command all our forces when the communication line is recovered by Motoki-kun." Sayo said to her vice.

"I will be with Anne-sama." One of the council members steps forward.

Sayo nodded and look toward Anne. "Do you agree Anne?"

"...Thanks for your generosity, Sayo-sama. I will do my best." Anne replied as she bow toward her.

.....

...

Anne knows Sayo doing it for her, after all his mobility is limited in her chair wheel.

>>>>>

Sayo, Satou, and other council members on the main harbor. They currently stand on the one of the tallest towers in the harbor which effectively make them able to view the entire island.

...They can see thousand of Fallen angels flying to the island from all directions. Everyone has a grim expressions on their face.

...The war is inevitable.

"I will hold the enemy main platoon here with Satou-kun. Everyone else please spread and coordinate with others. Remember, please priority your own safety." Sayo announces to her whole council members.

The other council members immediately spreading themselves as told, leave Satou and Sayo alone in the main harbor. All other members just leave them alone because both of them was enough.

"Roger."

Satou nodded and raise her knife from her pocket. 

*Slash*

...

She also cut her skirt short, leaving her pink sundress a bit ugly but she knows that to care about clothes is probably a mistake on the battlefield.

"Since you are more close combat approach, I will support you from behind, Satou-kun." Sayo said.

Satou didn't answer but her eyes show her agreement toward Sayo's plan.

....

"Captain, it seems there are 2 people in this harbor. One has vampire aura and one is a normal human." One of the fallen angel scout informs his captain.

"Hmmm. Strike them along with the harbor." The captain of the fallen angel commanded.

"Prepare the light spear!!" 

!!!!

!!!

Hundreds of light spears appeared in the daytime, brightening the sky furthermore as they prepared to destroy the whole harbor.

...

"I forget that they are using light magic. My vampire barrier won't be able to hold all of them." Sayo muttered.

Hear what Sayo said, Satou come close to her and said "Sayo-sama, throw me to them with your vacuum shoot."

"What are you planned?" Sayo asked with a surprised tone.

"Killing" Satou replied.

...Sayo looking toward Satou and seems she is determined to do it.

"Alright. Don't kill yourself or Iris-sama wouldn't be happy about it. [Blood Magic: Vacuum shot]." Sayo chants her spell to Satou then Satou gets thrown away to the sky quickly.

*WHOOOSH*

!!!!!!!!

*Slash*

!!!

"Aaargh."

The moment she arrived in front of the fallen, She immediately severed one of the fallen angel heads, adjust her position, and in a split-second use their bodies to hop to another fallen angel attacker in the sky.

*Slash*

!!!

*Slash*

!!!

...Fallen angel army who saw this panicked and of course in chaos.

"Stop her!!"

"We can't captain, she is too fa--" 

*Slash*

!!!

"Run!!"

...

However, despite the chaos Satou created as she hopping and killing the fallen angels in the sky, some of the light spears still launched toward the harbor where Sayo waiting with a barrier to protect it from full destruction.

*Bzzzz*

!!!!

Sayo did her best to protect the harbor, thankfully the amount of light spear she need to intercept aren't that much due to Satou creating chaos in the sky.

...

"Shoot that vampire! She protected the har--"

*Slash*

The fallen captain's head got severed before he was able to complete his words.

!!!

"Captain!!"

*Slash*

!!!

*Slash*

!!!

....

After that, It's a truly chaotic situation for the fallen angel attacker but it worked very well for both Satou and Sayo.

>>>>>

A war broke everywhere within the island, as most vampires choose to fight rather than hiding in a shelter.

After all, all the vampire in this island has their own unique power. 

A lot of screams, explosions, gunsmoke, and cry resounding within all the parts of the island.

While vampires have the ability to deal with enemies, exorcist and the fallen angel with their light spears is their nemesis.

Vampire power also reduces a lot in the daytime, which makes them at disadvantage.

...

After completely protect the main harbor and massacred all the fallen there, Sayo told Satou to go central plaza on the island as Anne has reported there is a huge amount of Rubina stray exorcists teleporting to the island from there.

Motoki has recovered the cellphone communication line. But he seems unable to recover teleportation magic limitation yet.

Satou dashing from side to side, killing fallen angel casually as she jump through the building while she went to her destination.

*Slash*

!!!

*Slash*

!!!

When she arrived at the center plaza, what greeted her was an overwhelming amount of gunshots aimed toward her, forced her to retreat.

*Bang* *Bang*

!!!

.....

"That's the pink-haired girl the fallen told us to wary about!"

"She is human but side with a vampire, kill her!"

"Shoot her to death She is dangerous!"

.....

!!!

*Bang* *Bang*

!!!

*Dash* *Dash*

Satou doing her best to avoid all gunshots coming toward her but even she is sure she won't be able to do it for long time. She want to get closer to the group of exorcists, but she was afraid she wouldn't leave unscathed.

She is forced to uses one of her trump cards to gain the necessary speed to massacre the group.

[Potential]

...

It is her newfound ability where she could access the future version of herself and become one for a short time. She like it a lot because in her future form she got much better speed and strength. Her only concern though that it seems even in the future she is still unable to master her special eyes.

She is also growing quite beautiful and she can't wait to seduce her Onii-chan.

Her sensei, Iris stated it's also the ability that makes her develop faster than most people. 

....

*Transform*

She transformed into her adult form (20 years old) and leaped to the group of exorcists in the blink of an eye.

...!!!

"Wait who is this wo-- Aaargh"

*Slash*

!!!

"Shoot her!!"

*Bang* *Bang*

"We tried but she is too fast!!"

...!!

Satou easily killed all of the exorcists within few minutes in her adult form.

Her speed, strength, and instinct are just much superior than her normal young form.

...!!!

Thus she was able to avoid someone's surprising attack with her instinct alone.

Someone tried to stab her back with a light spear.

"Hoo... you are able to avoid that" (???)

Satou looking at the guy with long black hair, elf ears who wear full black attire, and having 5 pairs of wings on his back floating above her.

"Kokabiel. Why you are doing this." Satou calmly asked in her adult form.

Kokabiel smirked and replied. "For more war happen in the horizon. Listen to those screams, gunshots, and cry resounding on the battlefield. I miss this feeling, the only feeling I could feel during the war. 

Well, another reason is that I hate every other race and I will prove it. The vampire is the easiest target for me since they had no god to back up then unlike Youkai." 

Satou actually wants to laugh because he forgets about Iris's existence. It seems Kokabiel is already consumed by his own power.

"I see you are already completely insane." Satou continued.

"I would say the same for you, Miss Knife."

!!!

Hear what just Kokabiel said, she immediately dashed toward him.

*BRRRRR*

Kokabiel begin to empower himself with dark power but he was just too slow.

...!!!

Satou (adult form) is already in front of his eyes in the blink of eye.

"You have sentence your own death, ugly elf."

*Slash* *Slash* *Slash* *Slash*

!!!!!!!!!

Before even being able to completely boost himself, Satou cut Kokabiel with a multiple slash-cut within a split second. It was possible thanks to [Potential], her speed was enough to do that in adult form. (Or Full Potential, but she just doesn't know it yet).

"W-What.. just.. happen...?"

That was his last word before Kokabiel become minced meat and exploded in the sky, spraying all blood and intestines of him arround the area. Well, there is enough blood already around her.

*Spray*

....

*Shrink*

 Satou immediately changed back to her normal form as she feel there is no need to enter that mode anymore.

Satou take out her cellphone and calling Anne "Anne-sama, I'm done dealing with the exorcist. Where I should go next?"

"Go to the east and find Iris-sama there. Help her with protecting the building there. There are a lot of important buildings right there, including the location of the shelter." Anne replied through the phone.

"Roger that." Satou replied and she hang up the call, then put her cellphone back on storage magic.

...

She also put out her spare dress, as her previous transformation ripped her previous clothes.

...

>>>>>

The war lasted for several hours already. At first, Vampire was at a disadvantage but in the night it goes opposite for exorcists and fallen angels as vampires get much stronger in the night.

Though, All of those exorcists and the fallen angels who were still alive vigorously attacked Aqua Eden and destroyed various infrastructure within the island.

Burned buildings everywhere, and a lot of vampires died during the daytime.

Vampire are winning at the end, but not without a cost.

Meanwhile, Iris during the daytime focus on protecting infrastructure as she doesn't have a lot of energy to spare during the day. 

But now the night is coming, and her power at it is peak.

The whole island was immediately shrouded with red mist.

!!!!!

...!?!?

*Shake* *Shake*

...

"What is this red mist?" (Exorcist)

"I feeling bad about this." (Fallen)

...

"This red mist, it is Iris-sama famous red mist." (Vampire A)

"Finally this fight is ended!" (Vampire B)

...

Everything shake within the island. Iris currently checking every creature on the island to determine which is foes and allies.

After she is done with it in few seconds, she immediately does one of her ultimate skills.

[Big Rip]

!!!!?!!

*CRUSH*

"""Aaaaaargh!!"""

A lot scream of resounding on the island at the same time.

Iris literally crushed the heart of every exorcist and fallen angel within the island, instantly killing them with her absolute dominion over blood and dimensional control.

Dimensional control is one of her specialties, especially when she also gets her power boosted by Great Red.

.....

"Sensei, she is always ridiculous." Satou muttered.

"That's Iris-sama for you!" One of the council members said.

"Long Live Iris-sama!" Vampire civilian cheer up.

.....

As every vampire within the island celebrates their win, Iris herself still feels cautious.

Iris was able to detect one person who seems able to survive her big rip and so she went to that person personally to end him with dimensional teleport.

...

It is one of the fallen angels... who are pretty much half dead already from her attack.

He should be dead already but something is currently occupied his body... something she feels familiar... her eyes too dark for a normal fallen angel.

"Hello, the escapist. It seems you have become much stronger than we last meet..."

!!!???!!!

Iris really surprised at the development.

"...Enosh. You finally arrived in this world?" Iris asked.

"Of course I am. This world is fascinating and much more powerful than the worlds I've been devoured before. You agree about that statement, right?"

"...How long you have been here?"

"I don't know. Time dilation is always different for every world. But one of my followers said it was a decade."

"That's quite a long time to hide your presence in this world."

"Not for me. You know my true nature. Decade actually considered a short time for me"

"What is your purpose?"

"You know it already, don't you?"

"...to devour this world?"

Enosh didn't reply to Iris's question.

"Just wait until I'm fully manifested in this world. I will pay back your group humiliation to me back then and I will make sure...  you will... follow your... world fate... this... time..." Enosh said to her as the aura slowly faded.

And it was gone, along with a fallen angel body who somehow burned in the air.

...

"Tch. I really need to speed up the awakened plan."

Iris decides to speed up her plan with Embroche descendant.

>>>>>

["No user appearance, but I have felt this whole clusterduck just started from here."]