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I didn't mean to own the copyright infringements and this is not one of new original Compile Heart's or Idea Factory's story for Hyperdimension Neptunia series, I hope you fully read the new fanfic and enjoy.

Previous in chapters:

Adult Neptune used demonic sword called: Murasame and she grab the dual wield revolver, now she begins to fight new type aliens with Croire, she saw was the zombie who's still remaining to be one undead alive, then the zombie has been killed by the trap from going in exit way and they have to get out from blood cave.

Then Adult Neptune finally got out of Blood Cave with Croire but Traveler Neptune has been controlled by insanity, then eliminating the monsters with one cut attack and brought the poison to monsters to bring their curse effect to creatures and they were all dead and vanished.

Now Adult Neptune has gained control of insanity because this personalities could be more Sadistic, and angry because this gives dark emotions: Anger, sadism, vengeance, and revenge.

She went in church tower, because she wants to head up to the bell tower and let Demon wake up soon after the final destination, let Night Demon erase all her dark emotions after the times who never beated the demon in subconscious mind and then she became Night Demon, Neptunia Reinawazaki was back in action after she woke up in the modern age of Gamindustri.

Now she'll be looking for monsters to slice through with her secret guts, she'd slice the monsters with her demonic katana: Murasame then she has made it new techinque but one creature got away and find a target to kill people as innocent, then Night Demon managed to kill one creature alive she eliminated after the battle started, then the last creature was found and then poisoned the creature.

Now in the next chapter:

Neptunia Reinawazaki was decided to travel to Lastation after the break is done, she'll move ahead all her way and keep walking until she reached into Lastation then she'll go into Bassilicom to meet Noire, she'll go in left to follow the trial ahead of Lastation, then she head into Lastation forest and find to get into a nation city.

But she was surrounded by monsters and preparing from the fight, she'll draw her demonic katana then she joined the fight to prepare fight the monsters all her own hands, she'll rush it to monster to begin attack then monster attacks Night Demon back but Night Demon dodge the attacks then perform a spinning katana attack then cut their head each the targets for enemies goes into for the way.

Every creatures shall die right? doesn't make Traveler Neptune feel comfortable with darkened  unconscious mind? Doesn't make it feel good with enhanced strength but with new dark powers, this is one of Traveler Neptune's point and she trade her soul with demon.

Night Demon goes into another monster and wait for monster to charge at Night Demon, but mindless monster charges at Night Demon then she'll counterattack at monster and slice the piece of monster and deliver poison for monster with her demonic blade, then she'll disappear all over her body to cover it up and go into advantage to slice every monsters by sprinting and eliminate everything with new word she said.

Neptunia Reinawazaki (Night Demon):"Eliminate all."

Then she reappears all whole her body then she'll see monsters poisoned by demonic blade and her new improved techniques that makes it to eliminate every group of monsters. 

Her katana is too powerful but can be breakable if they managed to break the demon katana: Murasame, the one weakness is only the way to break this demonic sword was the powerful abilities that can break the sword and kill the demons.

All monsters is now vanished after passing out and Neptunia Reinawazaki continues to move forward to go into Lastation, she'll be passing the way out of road then she still walks forward, after 23 minutes later, she'll almost reach to Lastation but she would like to take a rest a little and want to buy a book but she never reached into book store to buy this book to read it.

5 minutes later.

Neptunia Reinawazaki continues again to go ahead of Lastation and travelling into place where she can move close to Lastation and now she'd now finally headed into Lastation, she wants to go book story if there's available to buy some books to read, Night Demon heads to book store but she didn't know where she can go to book store.

But she learns how to go into book store and she finally found the one book story but how kind credits she had this one as coins? but she has this more coins like she used her body to take it over and go inside of book store to buy a new book to read it.

She goes after the seller and she choose this books to buy that is history and biology.

Neptunia Reinawazaki (Night Demon):"Hey, would you like to give me a two books like history and biology for me, I'll pay you like I want."
Book seller:"Oh sure. I'll give you a two books and that costs 540 credits"
Neptunia Reinawazaki (Night Demon):"That sounds like little bit expensive but I'll pay those credits with you."
Croire:"[This demon can read a book? sounds like a strange but she loves reading books a lot!]"

Neptunia Reinawazaki pays 540 credits that is a real cash after that and Book seller grab a two books then Neptunia Reinawazaki took a new two books and she leaves the book.

Neptunia Reinawazaki (Night Demon):"Thank you! I'm about to read this today. :)"
Book seller:"You're welcome!"
Croire:(Why is this women bought a new two books? she really loved a book to read.)

After taking a step to walk through the streets, Neptunia felt comfortable after she keep moving like this time... She still walking forward to the basilicom, she still wishing to meet Noire and be happy to meet her but she got a plan with her trick is to show that is Adult Neptune, so she could go to strict street area to move on a shortcut, but the couple of bandits has been arrived because bandits are moving to the Lastation nation city for more robbing items.

Night Demon was shocked to see bandits who asks more items to grab it and drop it down all two bandits.

Bandit #1:"So you are the one of red eyed demon here?"
Bandit #3:"We'd been surprised to see your damn sexy looking!"
Neptunia Reinawazaki (Night Demon):"You'd been waiting for me to challenge with you? But did you get a power to do anything to beat me?"
Bandit #2:"Hah! we've gonna smack you down where these demons are living here and we came to kill demons like slayers!"
Bandit: #4:"Yeah! Let's see what you've got demon women!"
Bandit #1:"Ahahaha...! Let's not talk here and finish her off quickly before those hero CPUs trying to wreck all your bones."
Neptunia Reinawazaki:"Hmph... Show me your guts and pain to teach me a lesson to do more."

Neptunia Reinawazaki draw and use her demonic katana to prepare a fight, as the bandits wearing a weapons to start into a fight, now the bandits have the turn to attack Night Demon with the most powerful crowded charge attack but Night Demon evades the crowded charge attack for bandits and she try to attack back with different fighting techniques.

Night Demon beats the all two bandits for the best attack, they try counterattacking her attack but Night Demon concentrates all counterattack's movements from thugs as bandits and then she begin to block the counterattack and cut all two bandits throat and torso.

Then black marking appears all two bandits and all bandits go panic because It's poisoning bandits with demonic cursed blade but got no choice.

Night Demon laughs sadistically at bandits after two bandits got killed all bandits charges at her with their fear and then attack then Night Demon dodged all bandits' charged attack then she slice every bandits with transplanted body and crows then get all bandits killed by the poison with Murasame real quick.

Now Neptunia Reinawazaki as Night Demon grabbed all her two books but she saw something was Black Heart, Noire.

Black Heart:"Who the hell are you demon?"
Neptunia Reinawazaki (Night Demon):"Oh my my.~ You found me and got me caught, congratulations. I introduce you with my name: Neptunia Reinawazaki, Night Demon."
Black Heart:"I didn't knew you were alive but you were supposed to be a dead?!"
Black Heart:"But where is the real Neptune like I saw you before."
Neptunia Reinawazaki (Night Demon):"I will show you with my secret."
Black Heart:"What secret?"

Neptunia Reinawazaki lets to transform to be a adult Neptune, It looks like her but that can be a disguised as Adult Neptune.

But this is only for Adult Neptune's perms to do something to cover her true clothes and true looks.

Adult Neptune:"Miss me, Nowa? :3"
Black Heart:"Neptune...? I thought you were the one of demon-"
Adult Neptune:"There's no demon here, Noire."
Adult Neptune:"I would miss you If I was long gone enough and not see you later!"

Black Heart transforms back to be a Noire, she wants to get closer to Adult Neptune, after figuring out what did happens in street district.

Noire:"I'm very worried about you, why didn't you just tell me you've got a new sword!"
Adult Neptune:"I got this new new powerful legendary katana after the first Japanese war!~ >w<"
Noire:"I cannot believe you'd controlled at this blade!"
Adult Neptune:"This blade is a living and It can be a soul that needs to live inside my head and body."
Noire:"How did you know if this sword forces you to abandon the humanity and take the responsibilities you got? 
Adult Neptune:"There's a secret, don't ask a question with me and let's move on, oh... Anyway I've bought a two books to start to read at this book with you."
Noire:"Really?! You'd wanting to read that book for today?!"
Adult Neptune:"Yep! I always want it try for first time! ehehehe!~"
Noire:"Hmmm... Alright let's go ahead of my bassilicom and get into a room then!"

Adult Neptune with Noire are going to bassilciom together, as we had more time to hang out around.

After 18 minutes later... Adult Neptune and Noire went now inside Bassilicom today, they would drop down in desk after she bought a new two books today. It would have tea party after Adult Neptune came back.

Adult Neptune: *Noms at cookie.* Mmmmm.~ Delicious cookie you cooked!
Noire:"I learned a new lesson to cook sweet foods after I was thinking to do more stuff!"
Noire:"Imagine if I would cook more better than Vert or Compa, you know I can hit more efforts and grab a scores with my favorite cooking style!"
Adult Neptune:"Woah! That sounds even really great! I never cooked at this before!"
Noire:"Yessu! >w<"
Croire:"Yeah yeah, sounds like a real fun time with bunch of tea and cookies..."
Adult Neptune:"How about we should watch a movie together?"
Noire:"I'm sorry. I've got a work but I'm finally free due to tea party started!"
Adult Neptune:"So would you try to read one new book for biology?"
Noire:"I would my best to read but the work begins under my desk."
Adult Neptune:"That sounds like you were all busy all time!"
Noire:"Yep... It gets me interested for hard working every time!"

After tea party ends, Adult Neptune wants to say something like surprise and secret for Noire, after showing her pure completed demon form after she said at her words.

Adult Neptune:"If you want to know what happens to my blood and body with living organism?"
Noire:"What you mean if one demon in your mind consuming your blood and take your body away?"
Adult Neptune:"You will find out. :3"

Adult Neptune's body was switched to be a Neptunia Reinawazaki's body, then It fully switched and transformed after scenario of pervious prologue and chapter.

Neptunia Reinawazaki (Night Demon):"Ehehehe... That's my secret remains hidden but you wouldn't find a secret."
Noire:"Who are you again?!"
Neptunia Reinawazaki (Night Demon):"I introduce you as you ask my name with different questions, my name's Neptunia Reinawazaki... Codenamed: Night Demon."
Noire:"You are... Night Demon! Why don't I know everything about you?!"
Neptunia Reinawazaki (Night Demon):"The confusion affects your intelligence and you will find to know all my backstories after previous era."
Noire:"That doesn't means It affects my intelligence, smartass!"
Noire:"Now... I want you to know what's inside your backstory, so what's up with previous era you lived?"
Neptunia Reinawazaki (Night Demon):"You want me to reveal my backstory? You asked nicely with your hotheaded question."
Noire:"Don't you dare to call me I am hotheaded girl like Blanc!"
Neptunia Reinawazaki (Night Demon):"Oh my...~ Don't get yourself nerves but let it begin."

Neptunia Reinawazaki reveals her truth and brought her previous Gamindustri era story for Noire that tells something like comrades, peace, war, conflict and victory.

Now the backstory of Neptunia Reinawazaki (Night Demon) after demonic era before modern era.

The Demonic Era of Gamindustri has the more important and darkened story after the new modern story who put into a new history. Neptunia Reinawazaki was born in previous era and decades before she grown up and became most powerful soldier than they were powerful soldiers, she is following steps to work smart and hard enough to accomplish the missions.

Gloria's demon knight #1:"Heck yeah! This is good time to hunt all monsters and live peacefully without chaos!"
Gloria's demon knight #2:"Ugh... Why you hating this chaos all time?"
Neptunia Reinawazaki (Gloria's Lieutenant):"They don't want to live this inside chaos along with soldiers and decided to live peace and have a nice rest with good cup of green tea or coffee."
Gloria's demon knight #4:"This makes sense, but I prefer to hate chaos and Gloria is doing something cringe shit chaos motherfucker stuff I'd never seen this before and she is savage but she is a childish devil!"
Gloria's demon knight #1:"Hmm... this is why childish devil was existed at this moment since we'd been arrived."
Neptunia Reinawazaki (Gloria's Lieutenant):"Yep... This gives me a headache every time."
Gloria's demon knight #3:"Let's hope we can be a angel and we have a lot of friends together!"
Gloria's demon knight #2:"This ain't gonna happen! We became demons who has demonic ability to do with their strength and power dumbass!" 
Neptunia Reinawazaki (Gloria's Lieutenant):"I doubt we became angel to live together and had infinity peace and fun before conflict begins."

They might to start working with her to follow the trails for monsters, killing the monsters to wipe the dust of all areas and clean it up, then they received for new event the unknown angel or goddess begin the war soon, they all got 25 days to live in peace before the apocalypse and confilct with war begins.

They started to pass the training with Neptunia Reinawazaki, then she teach all warriors, archers, and supportes to know the strength and weaknesses to start a new plan and get into new direction before the war begins. 

They were growing greatly stronger and they will greatly weakened angels, they were able to kill the goddess as they were doing but they were still weak to hold it on. It takes a days to grow all strength and intelligence soon as possible to hold the war and defend the base with a new blood cave where they built new army to make the part of family and build a strong part of family to rise and turn into invincible demon army together with strong family part after the new base built for the new homes.

After the 2 weeks later, the war is now declared as known for new unknown goddess to keep looking for demons who's keep hiding for this, the devil was still in Gamindustri and demons didn't realized why they were appeared in Gamindustri to start coping human bodies and then they make it look like identical as humans.

They were now wearing the armors to look like knights, like they were used to be a knights and protector of goddess, the demons are now become protector of devil to take responsibility to take all missions to start deploying into war zones to attack every creatures with enemies.

Now they were starting to fight between demons and angles during in this war, all minutes later on the new fight and conflict, they expected only living in peace with angles but angels refused to have peace with demons and decided to kill demons no matter what they refused it, they keep fighting it in first round ever It'd never been gun before the new hate.

then Neptunia Reinawazaki's comrades are now gonna hide in this place to make a surprise for angles.

But unfortunately for Gloria's demon knights, Neptunia slices all her comrades to put into sacrifice to gain new cursed powers and create a new power effect that poisons an opponent.

Now the angels are charging at demons, the demons used the shields to block angel's attack, trying their best to win the defense but angles are strong and they are able to destroy the shields to kill the counts of demons they want to count to kill.

But demons are heading to aim and shoot angel's head with effect that would do for angels, then they losing count of units of angels where angels are trying to hit and destroy blood cave where demons are living here with vampires.

Demon's secret armies who allowed vampire bats bite the humans and they were transforming to be vampires to have secret addition soldiers to assist more soldiers to keep more defended and make a plan to kill goddess who doesn't let demons take a rest until they were prisoned or dead.

Time skipping.

Now the wave isn't over, demons was about to surrender and angels spared demons little bit but demons wants to tell apologies and share this dark power to angels, angels felt like a trap but this is worth of demon power like real dark power, to give a best medicines for angels like doctors giving a good medicines for humans.

Neptunia Reinawazaki was looking for the power that can stop angels for attacking the secret before It's too late, she has the new power that can absorb their souls to collect this soul and get a power for angel to become a new goddess and stop angels fighting demons and then have a chance to defeat a Goddess who gets herself corrupted.

Now the battle started with one devil as demon queen and one goddess as true CPU herself, they were fighting each other, thus. Conflict begins until It ends.

Gloria:"Now... What you will gonna do we cannot live without existence with devil and god with goddess like you?"
Svetlana (Jesus):"You made the wrong question, they gonna live it but they had living existence who became a new goddess or devil, If they want to replace at goddess after devil has won battle. They are making it worse or best."
Gloria:"I would replace you and I will take your powers away before I die like a old girl!"
Svetlana (Jesus):"Try it, you had unstable breakdown of your life and emotional shit stuffs like humans!"
Gloria:"Show me your dancing skills to have challenge with this battle motherfucker!"

The devil was named: Gloria the satania herself, she was born in satania herself who became a fallen goddess after she was becoming a new devil in world of Gamindustri and old era Gamindustri, after she became a devil real Demon queen.

The true goddess who created a new CPU form but she became herself new CPU form: Svetlana the new goddess herself.

But if one demon can become a new goddess. It's her turn to keep her demon powers all she got is angel power to prove she become a angel but If she killed one goddess, then she'll take the perm power and lead to become goddess with new evolution, Neptunia Reinawazaki got no time and she might to hurry before she find we failed in first war If one devil is now being killed by goddess.

And... who win the war, devil (demon king/demon queen or god (goddess)? The way is to find out who can win this demon war with angel appearance, first Gloria put her demon sword and put herself charge at Svetlana, then goddess preparing for counterattack until she give a hit to her.

Before Demon queen's attack fails, due to goddess counterattack but more to be professional or extremely talented technique battle than Demon queen's battle technique, they were more like both rival and enemy. Gloria carefully paying attention and she would get hit by Svetlana's counterattack but Gloria fights back with counterattack and put herself with brutality and savage attack techniques and then she give a hit at Svetlana.

Awhile. Svetlana become a nearly bad shaped and got a slaughter damage all over with wounds by strong and fast brutal with savage... Then Svetlana heals and regenerates herself with thanks of angelic and goddess power and nice strength with better stamina.

Gloria never realized how Svetlana took her power and used for regenerating and heal too fast, she cannot even do same same healing but she has nice potential powers and strengths and had normal regenerating and fast heal like Svetlana, she was real tough and very savage like this and insanity consumes her bloodlust and life to start something chaos in Gamindustri.

Gloria is the real evil women, that she becomes devil in the world of Gamindustri, tearing it apart and make more evil things in the life of existence.

Svetlana realizes how Gloria has been changed since the old days while she meet at Gloria to work together and she loved it once more. But this time with new rival, this goes into war and battle between devil and goddess thus, they would fight each other first time.

Gloria:"Let's see what you've got Svetlana!"
Svetlana (Jesus):"Cm'on..."

Gloria take a charge again at Svetlana and slice her fast before Svetlana dodge or counterattack at her, Svetlana summoned her shield blocking at gloria's attack with shield, Gloria took a move way to get her behind and Svetlana look backward and shield herself with Gloria's attack, Gloria moves faster and then she fortunately able to slice and knock her down.

Unfortunately Svetlana was failed to shield herself because Gloria's speed is getting faster than she thought, Svetlana are unable to shield it with devil's fasters speed which is unfair enough for her and Gloria had to move closer at Svetlana and then she stab Svetlana but Svetlana dodges her attack.

Then Neptunia came in and stabbed Gloria with a new power and new poison who created herself a new demonic sword called: Murasame.

Gloria:"Neptunia.... W-what are y-you d-doing?"
Neptunia Reinawazaki (Gloria's Lieutenant):"The sickness affects your comrades, the chaos you made it yourself and they were all sick because of you."
Gloria:"Y-you are lying! I'll take y-your p-power away...!"

Gloria trying to stab back at Neptunia but unfortunately she unable to do because she can feel is poison and It appeared black marks all over her body, then she slowly dying until she passed out.

Svetlana (Jesus):(Who is she...? Isn't she the one demon who stabbed a devil and killed her..?)

Svetlana didn't even know if Neptunia exists to be a real hero, Svetlana thinks Neptunia is a another enemy of Gamindustri but she become a defender of Gamindustri and she took a plan to defend a Goddess.

Neptunia Reinawazaki (Gloria's Lieutenant):"Today is the defeat of devil and victory is Goddess, Jesus herself, because of the new victorious for angel and new peace awards for angel and demon to start give up for the real fight."

Svetlana doesn't want to spare but she give up fighting a demon who caused this problem but Neptunia fixed all problem after she made it, Svetlana spares Neptunia after this war has been lost.

Svetlana (Jesus):"Hmm... I expected for nothing a real peace around with demons, but I would spare your life and pleased to meet you first time for killing one devil."
Neptunia Reinawazaki (Ex.Gloria's Lieutenant):"Since I departed from Gloria and begin to sacrifice demons to gain new power of curse."
Svetlana (Jesus):"I see... You are not one of her Lieutenant, the Demon Queen herself has been passed out after you betrayed her."
Svetlana (Jesus):"This makes it feel like If angels were involved and evolved to be a stronger but ended up become a demon, they gained a demon soul to turn themself to be a demon.. I give up in battle, they were draw today."
Svetlana (Jesus):"This wish offers a new name that requires to name it."
Neptunia Reinawazaki (Ex.Gloria's Lieutenant):"I would call myself: Night Demon."
Svetlana (Jesus):"Wish granted, you are being named as Night Demon. You were now promoted to be a real new goddess."
Neptunia Reinawazaki (Night Demon):"Thanks Svetlana."
Svetlana (Jesus):"You were pleasant to meet a new angel. Welcome to the new peace."

After that Neptunia Reinawazaki named: Night Demon, this is one of new name that wants it new peace and new world Gamindustri.

After she became a new goddess, she celebrate it for all demons and angels after the new defeat of devil in demon war.

Back into present day.

The backstory for Neptunia Reinawazaki ends here after she telling at Noire... Afterward, Noire heard of something tragedy and battle within demons and angels.

Noire:"Hmm... I see, this might be more tragedy they made it."
Neptunia Reinawazaki (Night Demon):"The tragedy made themself with conflict and chaos on humanity."
Noire:"Anyway, who the hell is Gloria?"
Neptunia Reinawazaki (Night Demon):"She's a satan herself, she became a new devil until her death."
Croire:"The fight that happens in old century and decades occured." 
Noire:"Uh-huh, Gloria betrayed the Gamindustri and she might to suffer including demons!"
Noire:"So... You are not one bad demon as you were being gentle at CPUs including me."
Neptunia Reinawazaki (Night Demon):" The Agreement of peace brought back into normal living, so I living in peace and move forward to hunt down monsters, would you like to be my new friend or partner?"
Noire:"Ummm... I'm sure you would friend me if you need a help with your friends each other! :)"

Uni as Black Sister, CPU Candidate who works with Noire now appeared at basilicom.

Uni:"Noire! I bought a documents here..."

Uni's face expression changed into feared and shocked expression face after she look at new demon.

Uni:"W-who'd been allowed to go into basilicom?"
Noire:"This is... Neptunia Reinawazaki, Night Demon herself, she can be your partner or friend If you want to assist her."
Uni:"Umm... Hi Neptunia-san."

Uni's face expression turned back to be normal. Then she wave at Neptunia.

Neptunia Reinawazaki (Night Demon):"Greetings, what's your name cutie?~"
Uni:"I'm Uni, CPU Candidate!~"
Neptunia Reinawazaki (Night Demon):"It's pleasant to meet you, miss Uni."
Uni:"How did you get here in city you went from Lastation?"
Neptunia Reinawazaki (Night Demon):"I went from the trip, travelling around all across Gamindustri to explore everything, remembering my old memories."
Uni:"Makes sense, you went in old age Gamindustri after you was born before becoming a knight?"
Neptunia Reinawazaki (Night Demon):"Exactly. I lived here since the new clan has been established for the new protection of blood cave.
Uni:"Blood cave? Sounds like It belongs to be aliens or vampires?"
Neptunia Reinawazaki (Night Demon):"This place doesn't belonged to be aliens, they were both vampire and demon who lived like a real soldier or knight."
Uni:"So you were born to be a demon because you became a powerful knight like humans could be a knight but you ended up to become goddess right?"
Neptunia Reinawazaki (Night Demon):"Yep, I am goddess myself, she promoted me to be a new Goddess as the role."
Noire:"Your outfit looks similar to my HDD form, how did you have this suit?"
Neptunia Reinawazaki (Night Demon):"My battle form that fits for demon/goddess as me."
Noire:"I see... It suits you with my HDD form, why's your battle form looking unique and hotter than my Next HDD form including every Next HDD form for CPUs?!"
Neptunia Reinawazaki (Night Demon):"I show my unique looking fashion later."
Noire:"Sounds fine to me to take a task to eliminate monsters how much you counted after you killed bunch of monsters and your comrades."
Neptunia Reinawazaki (Night Demon):"We're first to move forward to get ahead of this forest."

The End. I hope you enjoy my chapter, have a holiday everyone! :3