Author's Note: Six months of trying to avoid writing a Harry Potter crossover for the Digital Human Series and it only further develops the idea. Well, consider this a non-canon entry. Why do I say 'non-canon'? Because this is not going to be tied to Digital/Culmination and is also going to alter my self-established rules a bit. Also, we have an extra character as you'd surely noticed with the description!

This story will follow Hakuno Kishinami as the main protagonist and Shirou Emiya (Fate Route) as a side protagonist. Spoiler Warning for Fate/Extra, Fate/Stay Night, and Harry Potter and the Prisoner of Azkaban (and all further in the series.)

The counterpart, the opposite, the rival. She is all these to this world of magic, yet also represents them at their best. Now, this Digital Human, unheeded by prophecy, shall change it all.

Digital/Antithesis

Chapter 1: Memory

A wide city-scape stood before her covered in flames. Skyscrapers crumbling and tilting as the fires ate away at their foundations, ash and smoke covered the urban landscape, coating the creations of mankind with a dark gray. This buildings below these deteriorating structures had been reduced to rubble, whether eaten away by the colors of red and orange, or subjected to the initial cause which started this madness.

This insanity which ate away at roads and homes.

All the people that cried and wept swept up by the fire.

Old and young, healthy and ill, strong and weak, engulfed.

The streets were not spared, the earth barren and blackened.

For what cause for this was greater than man's desire for war?

To render their enemies to husks, to spark a conflict.

She could hear those sounds, the ignition of gunpowder, the crackling of explosions, the thundering of vehicles, the insults to another's humanity.

What divine force could hope to match the ingenuity and passion that drove mankind to commit atrocities?

They had created hell beyond hell.

A purgatory for all,

None survive, but one.

She was borne through perdition.

To never forget this event, to have it burn deep in her memory, even when nothing else would remain this would.

This would mark her last moments.

It would be her death.

Yet, this was how she was born.

Eventually, the rain would come, the screams would stop, the fires smothered and smoke dispersed. All that would remain would be a devastated landscape, a collection of rubble that marked a once prosperous city.

But the question would remain.

Why?

Hakuno Kishinami's brown eyes opened wide, staring up at a cerulean sky dotted with white puffy clouds. The fifteen-year-old female teenager sat upright, long brown hair wavering in the gentle, yet chilly breeze as her fair skin glistened in the sunlight.

Her eyes trailed over her body, checking her condition firstmost, a light brown uniform covered her entire body, long-sleeved and a ribbon at the neck, it was a decent overcoat uniform over a black wool shirt hidden underneath. The uniform went down to her waist, ending with a skirt that fell halfway to her kneecaps, a pair of black pantyhose went up to meet it, while basic uniformed shoes protected her feet.

As her fingers padded her body for any signs of injury, Hakuno Kishinami noted an odd ring-like object attached to a finger. She pushed it aside for later and examined her surroundings.

It was a type of woodland, not a forest but a region of trees with rolling green hills. She didn't recognize the environment, it certainly wasn't Japan, it certainly wasn't the Moon Cell.

The Moon Cell… She had been inside that reality-warping supercomputer's very core. Hakuno Kishinami had been the victor of a cruel tournament, a kill-or-be-killed deathmatch against one-hundred and twenty-seven individuals besides herself.

It was known as the Holy Grail War, a battle for control of the Moon Cell to granting any wish they desired…

And she had killed all but two for her selfish wish to simply survive.

Hakuno pushed the thought away, brushing her hair with her fingers of any grass that had caught up in it. Whatever the case, she was in a new location, by means she couldn't remember, as surely the Moon Cell's Core hadn't deleted her as expected.

A digital copy like her, an impossible fluke in an otherwise flawless system, gained self-awareness purely by accident. She should have been erased while inside the core as corrupted data, yet that apparently was not the case.

She stopped her action and moved to look around once again. There was no single clue where to begin, it felt like she had been dumped in a location.

The girl's eyes settled on the grayed-out mark on her left hand, the Command Seals were entirely dormant, which meant she was truly alone.

Well, she'd best pick a direction and start exploring.

If anything, she was used to exploring unknown places.

So she walked…

And walked...

Not an hour later…

There was a house sitting right in the middle of seemingly nowhere.

It wasn't very large, only a story high. A single floored building from its exterior outlook, the chimney rose from inside this western-style house, even if it had an older appearance the design was identifiable.

Hakuno Kishinami approached the dwelling, before suddenly jumping at the audible sound of a barking dog. She turned and faced a medium-sized snow wite canine, a samoyed.

The dog rushed to her, barking constantly with ecstatic emotion, she took a step back in mild alarm, but there was no fear.

A small animal like this was nothing compared to the deadly intent of a Heroic Spirit.

She kneeled down and the samoyed stopped its wild barking and became more passive, then decidedly approached her while sniffing. Her hand brushed against the animal's head before stroking its ears, enjoying the sensation of feeling the dog's fuzzy fur and warm body.

"Good dog," She praised it.

The brown-garbed girl stood back up and knocked on the door, but there was no answer. Again, she knocked, however, it appeared the resident was empty despite the dog's presence, which the canine sat next to her looking up expectedly.

"Hello?" She opened the door, it was unlocked.

Hakuno Kishinami walked inside cautiously, it was well-lit by the sunlight through the windows, most of what was here was clearly derived from the English design of its living room, kitchen, and bedchamber. She recognized this from the interactions with other particular Masters in the Moon Holy Grail War. However, there was an oddity, the dishes in the kitchen area were cleaning themselves while floating in the air!

She didn't see any signs of advanced technology, which implied this was some type of magecraft.

That was an impossibility outside of the Moon Cell.

The world's mana had dried up, magecraft had degraded and faded away to but only the remaining remnants that designated a Spirit Hacker. These individuals conducted digital magecraft through a technological medium by use of their magic circuits, and a connection to the Moon Cell's outer layers.

It was no longer possible to manifest mysteries in the outside world of Earth.

Yet proof was right before her eyes.

Did that also mean she could use Code Casts? The digital magecraft that Spirit Hackers used as a replacement?

Bang!

Hakuno ducked for cover behind a kitchen wall from the sound of the loud noise similar to a mild explosion. The living room had been covered in dust, her sensitivity to magical energy from constant battles had just caused her to tense up. That had been a lot of energy, but it disappeared rapidly so that whatever cause had faded away.

"Ow, that's going to leave a bruise," A young man's voice echoed from the living room.

Her eyes narrowed as the dust cleared, revealing a disheveled area with furniture scattered and toppled. On top of the couch, sat a boy looking older than herself, his skin was tanned fair. He had red hair and wore a blue and white short-sleeved shirt while wearing a pair of jeans and tennis shoes.

"Woof, woof!" The samoyed barked fearlessly at the newly arrived boy.

Hakuno stepped out from behind the wall, her body ready to move if a conflict occurred. Though, she doubted it would come to that.

"Um…" Hakuno said, unable to word exactly whatever she wanted to say.

The young man turned his attention to her, he quickly stood up but didn't make any move towards her. He glanced around a bit, before putting up his arms in an apologetic manner. "Sorry, I didn't mean to crash into your home like this. Please forgive my sudden arrival." He did a half-bow, a clear Japanese trait.

She now recognized his Asian features, then again, he had also spoken in Japanese. He likely unconsciously assumed her to be as well, given her appearance and attire.

"It's not my home, I also just arrived," She explained, though it had been outside. "Maybe in the same way, I don't know."

He looked mildly shocked, "So you don't know where you're at?"

She shook her head, "No. But there's magecraft here."

"You're a magus?" He asked; the girl noted his posture took a more rigid stance.

She didn't fault him for the reaction, plenty of Spirit Hackers, the magi who could access the outer layers of the Moon Cell, had intentionally desired to kill others for their own reasons. She was one of those who didn't want to kill others unless forced by external factors.

"Not really," Hakuno replied. She decided to put forward a friendly introduction, "I'm Kishinami Hakuno, nice to meet you."

"I'm Emiya, Emiya Shirou. Pleased to meet you too."

She stood behind him, guarded by her Servant's world of blades against the enemy Heroic Spirit. This Nameless hero that cast off his name, but revealed it to her after their weeks together in this cruel tournament.

"Archer?" Hakuno said.

Shirou blinked in confusion, "No…?"

"You aren't the Servant?"

He seemed very similar to Archer, sure his appearance was different, but there was just something that seemed familiar about him.

"You know about Servants?" He questioned curiously.

"I was… In a Holy Grail War," The girl answered.

Shirou visibly tensed more than before, his arms dropped their casual motions and looked like he was to grab something invisible. Hakuno knew that there was magecraft that could give him a weapon, but she didn't desire to fight the boy.

"I stopped it from ever occurring again," Hakuno added to her previous answer.

He relaxed a bit, understanding in his expression, "I had done the same. If we both ended the ritual, yet weren't part of the same war… Different worlds?"

A parallel world.

It wasn't surprising, she had known about them, even faced against a Servant from a peculiar one. Her mind was a mess of vague memories, the time in the Moon Cell Core had scrambled what she did in the Holy Grail War with other timeline variations. She couldn't even recall which specific Servant she had by her side the entire time, only different ones.

"I've dealt with a Servant from a different one," She replied. "So yes."

With that tense meeting out of the way, they can progress further in solving the current situation.

She needed to be more direct, information gathering was critical in this unknown situation. Rin Tohsaka had taught her this and it had saved her life every time.

Shirou Emiya seemed to be at a complete loss of what to do, he wasn't the calculating, cynical individual that made her Archer Servant in one of the memories. But, Hakuno Kishinami knew her Servant, even if she couldn't recall the specifics clearly, she was keenly aware that in the timeline he had taught and supported her.

If this Shirou Emiya was her Servant's past in another timeline then he should be trustworthy just like him.

Rin would yell at her for this, but Hakuno wasn't so skeptical of people.

"Let's gather information first then," Hakuno spoke up with renewed confidence. "I'm also from a different world, I was the lone victor in the Holy Grail War, I should have been deleted at the end but instead I woke up nearby."

He arched a brow at her for a moment.

"Deleted?" Shirou remarked. "So… The Holy Grail War for you was also a hellish mess? I'm glad you survived though."

"Thanks… My Servant kept me alive," she admitted. "I only wanted to survive and stop it."

He raised a hand, "You don't need to excuse yourself, I can tell you're a good person," He said. "I know what it's like to go through one."

She nodded, now that they had an equal footing in understanding, it should be easier to get along.

"What about you?" Hakuno asked, walking closer and relaxing a bit more from her previously tenseness. The samoyed had already stopped its barking and instead sat next to her, panting with a wagging tail.

Shirou looked thoughtful for a few seconds, then answered, "Not the same for me, my war ended months ago…" He had a fond expression before he knocked himself out of it. "A Dead Apostle sent me here, but it's hard to recall the details exactly why… I'm supposed to help somebody and I agreed because of that."

"I don't know what a Dead Apostle is," Hakuno stated. "But you decided to come here to help somebody?"

"Yeah, there's nothing wrong with wanting to help a person," Shirou said.

"I know," She agreed, much to his minor surprise. "It isn't wrong to save somebody."

"Yes! Exactly!" He seemed quite ecstatic.

She blinked at the sudden exclamation, "So who is it?" Hakuno Kishinami asked.

"I… Don't know…" Shirou frowned as if racking his brain for an answer. "The trip here wasn't pleasant. All I remember is that they're apparently some Inheritor and that they had some wish."

"We both had memory loss of the last moments before the transfer," Hakuno deduced.

Well, she didn't exactly have memory loss, rather it was mixed up with different variations.

Oh, wait, that's right, she couldn't recall what exactly happened in the Moon Cell Core after alerting her friend of her Earth counterpart's condition.

They were back to mostly square one.

"Let's check around, maybe we'll get some clue," He suggested.

Hakuno Kishinami and Shirou Emiya, after fixing up the living room a bit, scouted out the rest of the building for information and possible answers to burning questions. In a stroke of luck, the brown-haired girl had discovered a journal near a fireplace with an odd jar filled with strange powder. While the young man checked the rest of the house, she delved into the written parchments and read up on a lot of information.

Which was notably written in English, a language that Hakuno thankfully knew.

There was a downside, the knowledge required more context to the terminology used. As it turned out, no terms remotely resembled those used in what little magecraft Hakuno had learned from Rin and Rani. And it also didn't mention anything concerning Spirit Hacking, but instead implied magic in a more fictional, fantastical method… If blurred by a realistic tone that gave it a sense of everyday expectation.

It was a bit difficult to gleam out because of that.

But she pieced together bits.

This home belonged to a 'wizard', who's last entry was four days ago. He had gone to meet up with a client but apparently hadn't returned. His fireplace was connected to a 'Floo Network', which allowed him to transport to a place called Diagon Alley with the use of floo powder, presumably what was inside the jar. He ranted on about how the 'muggle' natural reserve rangers had been coming too close to his 'muggle-repellent wards'. He also purchased a dog to conduct a ritual on his return in order to create a more powerful 'ward'.

Hakuno was displeased on harming such a lovable dog, it seemed happy to be around her.

Moving on, there were other unfamiliar terms that didn't have the context to explain. Such as 'wand', 'Ministry of Magic', a whole list of ingredients for 'Potions', and different words written in what appeared to be Latin.

She placed the journal down and lay her hand against the fireplace.

Her magic circuits surged with od, inner magical energy, the brief image of a city lit aflame flashed in her mind.

"Code Cast: View Status," Hakuno said.

A few sentences of basic information filled her head, proving the viability and truthfulness of the journal's notes about the Floo Network. It hadn't been much, but she had been able to glean a large-scale interconnected roadway that spread out between multiple locations.

She switched off her magic circuits.

So, this Floo Network worked similarly in function to the transportation method used to travel between the school and the Arena within the Moon Cell. It was quite impressive if requiring the use of external factors.

But she knew how to use do it now.

The door opened as Shirou Emiya came back inside, "Kishinami, the area is surrounded by some type of Bounded Field, but it's different from what I know of them."

"You can call me Hakuno," She said, feeling more comfortable with a casual address.

"Shirou," He agreed.

"Here," Hakuno handed over the journal. "Information."

He took the journal and began flipping through the pages, skimming along with its written context. "I'm not too proficient in English…" His eyes glanced to the fireplace, then to Hakuno. "Did you check…?"

"I used a Code Cast to analyze it," She replied.

"Code Cast?" He said in confusion at the term.

"It's digital magecraft," The girl explained.

"Never thought I'd hear those two words together, I guess your world went very different," He said. "Oh, I also found a bunch of newspapers!" He exclaimed as he walked a bit off then returned with a bundle of papers, which he placed on the now re-aligned table.

Hakuno blinked, "They're… The pictures are moving."

"Yeah, I noticed that too, but it appears we are in the United Kingdom," He noted. "The Ministry of Magic could be similar to the Mage's Association or the Clock Tower."

She didn't know those foundations, but she did recognize what he probably meant to imply, "Or the Altas Institute?"

"Don't know much about them at all," Shirou said. "But, this Ministry seems to behave more like a government."

Hakuno tilted her head a bit as she looked through the confusing jumble of newspapers.

"Huh…" Shirou said suddenly.

She looked up at him, "What is it?"

"N-nothing…" He tore his eyes are from her gaze, then pointed at a particular newspaper. "Mass Murderer, Sirius Black, escaped from Azkaban prison…" His expression changed into a more serious tone, hands gripping the paper and raising it closer. "Responsible for killing many muggles… Follower of the deceased Dark Lord… Incredibly dangerous."

"Muggle is the mundane, correct?" Hakuno asked to clarify.

"Seems so," Shirou said. "Given what we're inspected so far, magic is hidden from the main population of humanity."

Hakuno nodded, she knew that much, it was the same in her world from what she read up.

She picked up a more recent paper and sat down, the samoyed jumping on the couch beside her and laying down; its head on her lap. Hakuno patted the canine's head as she looked into the paper's content, "Dementors at Hogwarts School of Witchcraft and Wizardry."

What are Dementors? The newspaper didn't detail them. They really needed more information.

Her eyes spotted the year of publication.

1993.

That was six years before the terrorist attack that would lead the global conflict and stagnation. That was six years before the scarring memory which marked Hakuno Kishinami's only remaining recollection.

A city of flames caused by mankind's desire for war.

If this wasn't potentially a parallel world, then the real Hakuno Kishinami would likely be a child right now somewhere, and it would be some thirty to forty years before the Moon Cell's Holy Grail War.

She shook her head, that wouldn't be the case now. There were other things to be concerned about.

The girl glanced to the fireplace.

"Diagon Alley…" She muttered.

It was some sort of marketplace, given what she learned from the journal.

"Shirou," Hakuno said.

He seemed to not have paid attention to her voice, his focus squarely on the newspaper he continued to read, the boy entirely focused on its content.

"Emiya," Hakuno decided his other name.

That caught his attention, "Sorry, what is it, Hakuno?"

"I have an idea."

It had been months since the end of the Fifth Holy Grail War, Shirou Emiya's memories still remain vivid of the entire conflict, from his summoning of Saber to her heart-wrenching departure after their defeat of Kirei Kotomine and the King of Heroes, Gilgamesh. He resolved to continuously look for her, to endlessly search until he could meet with Saber once again. But, in that time, he would pursue his passion and drive to become a hero of justice.

He had remained in Fuyuki with Illya, Sakura, Taiga while Rin Tohsaka had traveled to pursue magecraft education at the Clock Tower in London. Tohsaka and he would send letters back and forth until Shirou managed to teach her on how to use a cellular phone. Thankfully, not nearly as difficult, as her prior experience in using house phones proved valuable as a reference.

But that wasn't relevant.

Shirou was invited to the Clock Tower by Rin, and seeing as he couldn't progress further staying in Fuyuki, Japan. He, Illya, and Sakura took a plane trip to the United Kingdom.

There he pursued studying his magecraft for a few weeks before he was approached by the Dead Apostle in which he warned adamantly about.

The memories after that point became a bit of a blur, the vampire was interested in making Rin his apprentice… Offered Shirou something… Then said to him about helping an Inheritor in a different place.

"-So if you help the little Inheritor, it might just bring you a step closer to her."

Presumably, the usage of True Magic had made recent memory cloudy alongside transportation. He couldn't remember fully why he had wanted to help, but it must have been a good reason.

Arriving as he did, Shirou Emiya hadn't expected to crash like that in front of someone. He was initially wary of Hakuno Kishinami, a magus and also a survivor of a Holy Grail War was a dangerous combination. But, he knew better than anyone that a participant wasn't always a bad person, and Kishinami did not act or appear like a murderer. The revelation that they were from different timelines was surprising, but not entirely unexpected given context.

Did he also send Hakuno Kishinami to help Shirou? Or was perhaps the girl the person he was supposed to help? She seemed unaware of whoever the 'Inheritor' was, but the user of the Second True Magic could have been speaking cryptically.

He will stick around, whatever the case, he couldn't just leave a girl behind when she seemed just as lost as he was.

Fortunately, Hakuno seemed to trust him. Perhaps, in the same way, she viewed him as a good person. She was relaxed and logical, immediately setting aside any tension in favor of working together and gathering information.

Also, the white dog seemed to enjoy her company, it didn't leave her side.

Moving on…

They were in Britain if the newspapers and journal were any indications. So he was in the same country as before, but an alternate timeline. There wasn't enough information they had on hand, just a lot of conjecture from what was provided. But Shirou did know, was that a supposed mad man that had killed innocents had apparently escaped this world's equalivent to a high-grade prison for magi, and had this scared the populace.

Shirou wanted to stop this man before he committed more murder, he wanted too.

But… That would leave Hakuno behind, he couldn't leave her unprotected.

Not to mention, he didn't know exactly what this world's magi could do. He wasn't the same naive individual during the early days of the Holy Grail War, the teachings ingrained in him by Saber and Rin, and the experiences he's gained all taught him to exercise more caution and gather information before charging in.

"You have an idea?" Shirou questioned Hakuno.

"Information spoke of Diagon Alley," She spoke to the point, "We can access the area with Floo Network."

"Floo Network… The transportation method mentioned?" He referred to the journal from before.

Shirou noted Hakuno's face nearly always was in this monotone expression, she spoke, "The only requirement is the powder and name of the target destination."

"No mana or od?" He mentioned.

"I don't know," Hakuno replied honestly. "It wasn't mentioned."

There was mana in the air, it could function as a ritual-based magecraft, though he wasn't knowledgable on the subject. He noted on his arrival that the mana quality in the air was higher, but not so much.

She did mention checking it out with her Code Cast… He didn't want to appear like he doubted her words.

Diagon Alley was supposedly this hidden marketplace for the 'wizards' and 'witches' here, which is likely their term for magi, only gender-specific. But, they would stick out like sore thumbs in their current wardrobe.

"We look too foreign compared to the fashions in one of the newspapers," He said, examining the girl's familiar school uniform that was similar yet different than those in the school back in Fuyuki. "Especially yours, it's much too specific."

Perhaps she had attended her world's version of the school?

She gave herself a quick look down, "This is all I have, Shirou."

"That's clear, and the previous resident was male…" he glanced towards the bedroom. "I doubt he'd have anything that'll fit you."

"A generic robe?" Hakuno suggested.

"It'd hide your garments, good thinking," He complimented and went towards the other room, Hakuno followed briefly behind, and Shirou rummaged through the tall dresser, picking out multiple robes. "I can make simple alterations if need be."

"You're a tailor?" Hakuno inquired curiously, her head tilted at a slight angle in abstract curiosity.

That… That expression was too much. He could barely handle it.

He shook his head, both to deny Hakuno's words and to clear his thoughts of her sudden cuteness. "No, but I can do it with magecraft."

He grabbed one, it was a typical black robe, he glanced to her. Hakuno and his facial features will still garner some attention, perhaps him a bit more due to his hair color, while his companion had more common colors. Still, it will help.

"Can you…" He excused himself. "Can you stand straight?"

"Sure," Hakuno didn't bash an eye at his request.

He brought the robe over and compared its size to the girl's smaller stature, likely due to her age, if he was correct in that she was younger. Indeed, he would need to cut it shorter and reduce its size, it's too large for her body's physique.

"Think you can tie up your hair?" Shirou asked.

"No," She replied immediately. "This style holds memories."

"Fair enough," He wouldn't argue. "Trace on."

His mental trigger fired, a sound similar a gunshot as his magic circuit flared to life and channeled od.

Hakuno's monotone expression broke for a moment, mild surprise dotted her face, but it faded a bit after.

He ignored it and did the needed alterations to the clothing.

"Thanks, Shirou," Hakuno replied as she took the robe and wore it, her brown uniform hidden underneath the black robe.

"No problem," He replied as he grabbed another for himself. "So… How does this Floo Powder work?"

It felt like her body was being prodded by a million sharp ends all at once, the pain shocked against her entire physical being. As if the magical energy that formed this Floo Network had surged and shook, disturbed by her very presence, disrupted in some manner.

But it lasted all for but a few short seconds as Hakuno Kishinami was flung out-

-And collapsed forward as green flames ignited and dispersed in short order.

She gasped for air, that had been a bad experience, but far from the worst. Hakuno Kishinami stood back up on her feet, ignoring the odd stares at her abrupt arrival as she patted out soot from the robe adorned over her clothes.

Another flare of emerald flame erupted behind her, Shirou Emiya stepped out apparently unheeded by the travel method.

"What's wrong, you look a bit shaken," Shirou asked in concern.

"Nothing, I didn't watch my step, fell down on arrival," Hakuno lied, not wanting to make a scene. At her excuse, any stares vanished and people continued on.

"You're not hurt, right?" He pressed.

"I'm fine," She replied.

The pain had passed and there were no injuries.

Still, why had she been subjected to that pain while Shirou hadn't?

It was a thought for another time.

"You remember the name to return?" Hakuno said, she knew it, but wanted to make sure he did.

He nodded, "Don't worry, I remember."

They both stepped a bit away from the exit point of the Floo Network and followed the general crowd out of the building and into the outside, where they met the rather stunning sight of Diagon Alley. The bright sun shone on a variety of different colorations and decor that enhanced the visual pleasure, shops covered every side and the centerpiece was a large stone-white building in the center.

Of course, there were tons of people, most wearing robes or other old fashioned garments, but there were some more modern wear, if a bit out of date, not that Hakuno knew too much about the trends.

The newspapers have indicated this as an entire culture of magic users, but Diagon Alley truly showed that fact.

But first, Hakuno needed to focus on gathering information. She needed to know the general knowledge the populace around her knew, the magical and mundane, the key differences as it were.

"Shirou," Hakuno said. "You got that currency we found?"

The red-haired boy revealed his projected wallet, inside was a coin pouch that carried a few of the local currency they managed to find throughout the household. "Yeah."

They knew next to nothing about local currency rates.

"Let's avoid most of the shops, we need to find a source of information," She suggested.

"Like a bookstore?" Shirou said.

"Yeah, oh,"

He had pointed directly at one.

Well, that was easy.