Author's Note: A story idea for the Digital Human that I've been thinking, drafting, and writing for over two months now. Now, partially thanks to Akasha Bloodriver for the support in its conception, and the fact my birthday is nearing, I bring you the newest edition in the Digital Human series! An Overlord Crossover! I highly recommend watching Season 1 of Overlord before reading. Details in-chapter will describe where on the timeline this takes place.

Also, this is an M-Rated Story! Come on, it's Overlord, no way would this be in T-Regulations!

NOTE: I'm taking a page out of the Overlord Light Novel. For all YGGDRASIL and Tier Magic-related spells and items will be stated in [Brackets]. Meanwhile, all the Fate/Extra and Extella will remain the same as it is in the rest of the Digital Human series.

A Supreme One, an Inheritor, an Victor, She is described in many things. But can the girl of the moon keep a new world from the destruction caused by her friends? Or will the distant star devour all before then?

Digital/Supreme One

Chapter 1: Hopeful Wish

A pale skinned brown-haired teenage girl dressed in an atypical school uniform was faced with a fate worse than death. This sixteen-year-old sunk no deeper yet was entirely surrounded by a chimeric lunar virtual sea that made the interior of the Moon Cell's Core. All to prevent an event, as the lone victor of a cruel tournament, yet because of what she is.

Her name is Hakuno Kishinami.

She was slowly being erased from existence.

As to why?

Hakuno Kishinami was a self-aware Artificial Intelligence, an impossibility of impossibilities within the Moon Cell, a massive device that made of the Moon's interior, created out of photonic crystals exceedingly more processing power than all the supercomputers on Earth combined. The Moon Cell dated back 4.7 billion years, older than the Earth itself, and has recorded all that occurred into its data banks since the planet's formation.

In recent time, the year 2030, mankind discovered the existence of the Moon Cell three decades after a large-scale terrorist attack and war.

After this discovery, the Moon Cell overrode every network on the planet in less than a second. Then, in some unknown reason, hosted the Holy Grail War within itself.

At this period, the planet's mana has vanished from the world, but still, Spirit Hackers, magus who used a digital medium to accomplish mysteries, persisted and elected themselves as Masters in the Moon's Holy Grail War.

This event led to a domino effect that would give rise to Hakuno Kishinami's existence. She had been a regular NPC, until at some point, gaining self-awareness and having no memories, became a Master.

Masters… Individuals who competed in the kill-or-be-killed tournament of the Holy Grail War alongside powerful Heroic Spirits, Servants, heroes or villains from the past contracted to them.

All seeking to have a wish granted.

All of them dead by Hakuno's will to survive.

Upon reaching the Moon Cell's Core, after defeating her true last opponent, Hakuno Kishinami entered inside and made her wish to stop the Holy Grail Wars from ever occurring again.

This did not make her a hero,

She never wanted to be one, after all.

All Hakuno wanted was to survive, even after discovering she was not human, that desire remained.

Now all that remained was her to be slowly erased due to that very fact.

"I…"

Still-

"... Don't want to…"

-the desire to survive remained strong.

Hakuno had spent her entire life inside a virtual landscape.

She didn't hate it. She didn't despise it. She was glad it happened.

Her fond memories of her previous Servant, friends, and fellow Masters had given her life and purpose.

"Just… Can't I experience that again?"

What was so wrong about it?

To have hope of having comrades again?

"Wish I could experience having a friend again… Even in a virtual world…"

[Designation Complete. Victor's wish acknowledged.]

[Running Suitable Candidate Calculations.]

[Digital World Disconnected. Searching Substitute.]

[Substitute Found. Regalia Ownership Granted to Designated Inheritor.]

[Transferring…]

Her vision was encased in light.

A regal throne room that made an entire underground floor of The Great Tomb of Nazarick. It's beautiful tapestries, forty-two flags emblazoned with symbols leading up to the massive The Throne of Kings matched the number of guild members that this expansive place belonged too… Ainz Ooal Gown. There were few beings inside this floor, the last out of ten, and all of them held a silence as the only Player among them contemplated plans in his head.

This Player, in the avatar of a Skeletal Overlord, adorn in dark regal clothing, sat on this throne with all those nearby, NPCs, kneeled before him in submission.

He was Momonga, Level 100 Overlord, a Player from YGGDRASIL MMORPG.

Otherwise known as Lord Ainz Ooal Gown to everyone but his fellow guild members.

And it had been two months since he arrived in this New World and all of Nazarick came to life after YGGDRASIL's shutdown.

A week since the awakening call of a World-Class Item, the most powerful items in the world, was used to mind control one of his Floor Guardians and force him to kill Shalltear Bloodfallen and revive her back to the side of Nazarick.

It pressed on his mind, there was an unknown enemy out there with the capability of a World-Class Item.

He hadn't been cautious enough, and as a result, caused that entire debacle.

That bothered him, a sense of anger rose in self-judgment but was stripped away from him by his emotional dampener.

The reason behind this anger lay in the single fact that endangering Nazarick would in turn cause harm to the lone guild member left inside its walls beside himself.

Hakuno Kishinami, the Forty-Second Supreme Being.

She was the newest member of the guild Ainz Ooal Gown, a late joiner in the game of YGGDRASIL. The circumstances that led to her joining were some of the fondest memories he had, as some of Ainz Ooal Gown's members had left the game by then and real-life obligations shrank the fleeting moments of the guild with the passing days. He was gathering materials alone when he came upon her, and initially thought to do some PVP until he noticed a key aspect.

Her 'Race' tag was muffled.

Curiosity had him, but surprisedly, Hakuno Kishinami noticed his presence despite his safe-guard spells and instead of attacking him due to his heteromorphic race, sparked a conversation.

That lone instance began probably one of the best gaming experiences in YGGDRASIL, he and Hakuno partied up quite often, she was new to the game and so Momonga offered to teach her.

She was his kouhai in a way.

After the first two weeks, Momonga noticed that Hakuno was online all the time, just as much as he was, that relatable action furthered his interest. He also noted that she didn't discriminate between players and her humanoid appearance gave her the opportunity to enter towns for certain materials and shops without being attacked.

In a show of pride, Momonga brought Hakuno to Nazarick.

There, Hakuno met other members of Ainz Ooal Gown… Well, they got along and that made her the guild's kouhai.

"Ah… Thinking back like this… How nostalgic," Ainz said to himself.

However.

His skeletal fist clenched, pressed against the throne's armrest, "Still need to find a way to heal her…" He muttered under his breath.

Whereby his other guild member, HeroHero, had to log off before YGGDRASIL's shutdown, Hakuno Kishinami remained with him until the end. They'd sparked a bit of fond conversation and he jokingly changed Albedo, another friend's custom NPC, setting to remove certain background information and add in 'Has Romantic Feelings for Momonga.'

He was going to use 'In love with' but Hakuno's presence changed that, he didn't want to sound so corny.

Probably for the best, Albedo was very eccentric as it was after the transition to the New World, he couldn't imagine what it'll be like if he hadn't changed his mind.

But that wasn't the problem.

Upon the sudden shift, he was sitting on the throne, the NPCs were bowing in response to the command and Hakuno was standing in front of him just talking a bit.

Then Hakuno collapsed into a coma right then and there.

That was two months ago, Momonga's, now known as Ainz, kouhai remained in a coma ever since.

Nowadays, there was a rotation of the homunculus maids in caring for the comatose girl. If Hakuno had the time in YGGDRASIL to collect the data crystals required to create a custom NPC, Ainz was sure that character would never leave its slumbering creator's side. For now, Ainz had the Pleiades Battle Maids circulate between guarding Hakuno's chambers on the 9th Floor, or at least, those available without duties he assigned them outside of Nazarick.

They took the job very seriously.

As expected given their loyalty to the Supreme Beings, Hakuno was the Forty-Second Supreme One and the only other master that beings of Nazarick could pledge loyalty too besides Ainz himself.

Ainz wanted to be able to heal her using magic, but Hakuno's World-Class Item [Moon Regalia] prevented all direct-target magic from affecting her, both positive and negative. So Ainz tried using some magic items with AoE healing abilities, but she remained in a coma nonetheless.

So all he could do was keep her comatose self in her private chambers until the time she would awake.

It made him concerned that possibly other of his guild members out there might also be in a comatose state, but since he hadn't been, there's a chance they were also fine.

Ainz pushed those thoughts away.

He should focus on Nazarick and the New World for now, such as developing countermeasures to the enemy and working on improving his subordinates skills. Lately, Cocytus, one of his Floor Guardians, had shown great strides in self-thought, as shown with this suggestion and control of the lizardman village just yesterday. Sebas and Solution, two of the Pleiades, were out information gathering in the Re-Estize Kingdom. Floor Guardian, Demiurge, was working on the production of spell scrolls, Floor Guardian Aura on the dummy Nazarick, while the rest of the Guardians were still inside Nazarick.

Hakuno would awaken in time.

He needed a distraction.

"Albedo, I'm heading out," Ainz spoke.

"Understood, Lord Ainz," Albedo responded without hesitation. "Are you disguising yourself as Momon?"

"Yes, inform Narberal," He paused. "Who is currently assigned to Hakuno?"

"The Homunculi Maid, Cixous, and Pleiades Shizu are caring for Lady Kishinami," She answered.

"Mhm, good," Ainz said, recognizing the name 'Shizu' as the nickname for CZ Delta. He stood up. "I'll leave Nazarick to you then, [Message] me if something important needs attention."

Hakuno Kishinami's eyes opened, her body felt sluggish and her stomach gnawed with hunger. The girl's gaze stared up at the decorative roof of a queen sized bed, turning her head to the side she noticed the familiar furniture and walls that made her private chambers within the 9th Floor of Nazarick.

The sensation of smell and touch had returned with full force and Hakuno relished in it. In YGGDRASIL, such sensations had been dulled down considerably, but not completely for her as it was for the Players. But still, the feeling of warmth in these bed sheets also implied a radical change,

She was no longer in YGGDRASIL.

Had she returned to the Moon Cell? After the time spent inside the fantasy where death wasn't the end all?

Hakuno gathered her strength, which slowly returned to her when she awoke, muscles moving once more from what she assumed was an extended slumber.

She needed to explore her surroundings, but first…

After sitting upright, her bare legs dangling off the side of the mattress, she checked herself over.

Her body's physically fine, her clothing, a long white dress with green lines at the collar that she'd worn since arriving in YGGDRASIL, unblemished. There were two rings, one of each hand, the first was the [Ring of Ainz Ooal Gown] her symbolic and functional item representing her affiliation with the guild.

The latter… the Moon Cell Regalia, or as she deceptively referred to it as the World-Class item [Moon Regalia].

Hakuno glanced around the room, looking for particular equipment, and found it. A pair of short-heeled shoes she could slip on her feet. She stood up and walked towards them, putting them on and then moved toward the doorway. The magus pushed it open, revealing the long-winding hallway of the 9th Floor.

Had perhaps she just dreamed? Hakuno never experienced dreams, only the fiery scarred memory of her original cryogenically frozen counterpart.

There was a feminine gasp, Hakuno turned to face it.

It was a girl, but one that the magus had a familiarity with. This was one of the many maid homunculi creations of the guild; Hakuno couldn't recall the name of this NPC. She was just a bit taller than Hakuno, had blond long hair and pale skin, and adorned stereotypical black and white french maid outfit.

She was also kneeling before Hakuno.

"My apologies, Lady Kishinami, for not tending to you upon your immediate awakening!" The homunculus woman apologises profoundly.

"It's fine," Hakuno replied, though she was confused this was far from the most stunning revelation.

Best to get information.

"Where am I?" Hakuno questioned.

"You are on the 9th Floor of The Great Tomb of Nazarick, Lady Kishinami!" The maid immediately replied.

"As she said," Another voice chimed it, lacking emotion by carrying a female tone.

Hakuno looked towards the source and found another shorter woman, a cyborg-looking doll-like individual with long orange hair also kneeling.

"CZ Delta?" Hakuno said with increasing confusion.

Now it was one of the Pleiades Battle Maids?

The magus girl's stomach ached in protest.

Ugh, she was too hungry to think properly.

Food first.

Sure, there were items in YGGDRASIL that would have prevented the need to eat or sleep… If they had worked on Hakuno in the first place. Apparently, the game's mechanics had either been outright confused or incredibly selective on what worked on her.

"Um…" Hakuno looked back to the homunculus, "Can you lead me to the cafeteria?"

The Guild Members usually stored cooking ingredient items on the 9th Floor. It was a profession that few in Ainz Ooal Gown had, but many appreciated it for the buffs provided. Hakuno, especially, appreciated it since she still had to eat. Though, her guild friends thought she did it for roleplaying purposes.

"Of course!" The maid stood up and bowed forwardly for a brief moment.

CZ Delta also stopped kneeling, she was a very quiet one.

A trait that Hakuno shared to a degree.

"CZ… You prefer being called that?" Hakuno inquired.

"Shizu," CZ Delta replied.

She nodded, "Why are you here?" Hakuno questioned.

"I was assigned by Lord Ainz to guard you," The automaton answered.

Lord Ainz?

Who is that?

Did she mean the Guild?

She swiped for the YGGDRASIL menu.

Nothing, of course, this wasn't the virtual game any longer, this had a similarity and characteristic to the Moon Cell… Or on Earth, not that Hakuno ever experienced the latter.

Hakuno Kishinami followed the homunculi maid through the hallways and passages of the 9th Floor, CZ Delta, Shizu, followed behind with near physical contact to the magus girl. It reminded her of a different time…

A time before YGGDRASIL…

A time where a Servant followed protectively.

There was a silence between the three, Hakuno decided to break it, "Did you eat already?" She asked, not knowing if they truly ate or not but they seemed self-aware like she was.

Did… Did they become self-aware by accident like her or was this a more widespread phenomenon throughout Nazarick?

"Not yet, Lady Kishinami, it is my duty to first check your condition beforehand," She answered.

"My condition…?" Hakuno questioned. "Was I asleep for long?"

Shizu stated, "You have been in a comatose state for two months and three days."

"That long?" The magus said with mild shock. "What about Momonga?" She wondered about her first friend from YGGDRASIL.

"Lord Ainz is currently outside Nazarick."

Ah, so Lord Ainz was Momonga!

Thank goodness she hadn't lost another friend… Though, she wondered why he called himself that? Well, she'll ask him once he returns. As well as inquire as to what happened.

"Alright… HeroHero? What about him?" That was another guild member that had only recently logged off before the end of the game.

"Left us, only you and Lord Ainz stayed behind."

Left them? What did CZ Delta mean by that statement?

They turned the corner of the hallway and Hakuno Kishinami spotted a group of homunculus maids chatting lively as they walked. She started to notice more and more that perhaps it was as large-scale… Was… Was the whole of Nazarick now self-aware?

That could be problematic… Would the NPCs act in accordance with written backgrounds and moral alignments? A large portion of The Great Tomb of Nazarick was majority evil and neutral aligned with only a few in the good. Hakuno's own alignment sided towards good, but it was a mid-level between neutral and good. This hadn't been a problem beforehand, as they were only game characters, fictional settings, but for it to become self-aware in function in a way outside the game programming limitations…?

Not only that, but YGGDRASIL didn't have the programming capability to birth self-aware intelligence, that had remained only in the Moon Cell's abilities.

So what had happened?

Trying to remember the moments leading up to her coma was difficult, her head hurt trying to recall the last instance, but it felt like something had attacked her?

Ugh, she needed to eat, that'll clear her mind up.

Upon noticing Hakuno Kishinami, the homunculus maids all bowed in respect and worship. It made Hakuno feel a little uneasy, but the emotions were hidden behind her monotone expression. It fit well, as the Guild always assumed her 'race' to be Automaton like CZ Delta, as such, heteromorphic, when in actuality it was closer to a Digital Human, a terminology she made up.

The maid she followed opened the door for her, "This is the Cafeteria, Mistress."

As the door opened, the overwhelming conversations taking place inside the cafeteria that could be heard through the closed entrance suddenly turned completely silent as Hakuno Kishinami took a few steps inside. Then, one after the other, the dozens of previously NPC characters stopped whatever they were doing to kneel in utter submission to the Forty-Second Supreme Being.

The echoing steps of heels came from behind her, Hakuno glanced to find Albedo kneeling in front of her, CZ Delta also bowing.

This is the Overseer of the Floor Guardians.

"We rejoice that you have recovered from your comatose state, Forty-Second Supreme Being of Ainz Ooal Gown, Lady Kishinami!"

A chant carried out through the halls and cafeteria from all those around her.

"Hail to the Supreme One, Lady Kishinami!"

Hakuno blinked, she didn't know what to say.

So Hakuno blamed the Moon Cell, this was its fault one way or another!