Note: I do not own Fate/Stay Night or Familiar of Zero, and I am only writing this story purely for entertainment purpose only.

Prologue

This is the story of a girl, a girl, who decided to follow the footsteps of the person who she believed in the most.

That person who she believed in, in reality, had also inherited that dream from someone who that person had also admired, that wish, although they were not exactly the same.

It was a simple wish really, one that was pure and came from the goodness of a person's heart: the wish to save everyone. The wish for everyone to be happy.

At least, that was the wish which the first person had, yet in the end he found it to be impossible. All he could do was minimize the damage, to save as many people as he can, yet never managing to save everyone. Kill one to save ten, eliminate ten to save a hundred, destroy a hundred lives to save a thousand, that was the path which he followed. Yet he found no recluse to the endless cycle, and all he found in the end was despair... almost. For at the end of his road, he still managed to find the peace that he was looking for. The son had taken the dream from his father's shoulder.

And thus, the son tried to do what his father could not, to try and fulfil the wish for everyone to be happy. He already knew that it was an impossible wish, yet he still struggled, and continued onwards to the path of despair..

Until he found love.

Love, it was something which the first man had, yet he decided to throw it away for the sake of his ideals, a mistake which he realized later in life, when it was already too late. His son who had inherited his dream, however, realized that this was the one true flaw of that dream, and thus did not make that grievous error. The son still continued the dream, and tried to minimize the damage and save as many people as possible, yet he did not throw away his heart.

One to save ten. Ten to save a hundred. A hundred to save a thousand. The man's son still continued on with this path, but whenever the his friends and loved ones become involved, he would change his priority.

Killing one to save ten, was ideally the correct choice. However, if that one was someone who he cared for, then the man's son would abandon the ten in favour of that person. Some would say that it was the right choice, others would say that it was wrong. Yet in reality, there was neither a right nor a wrong answer. For in truth, either choice would have its pros and cons.

He may have acted rashly. He may have acted selfishly. He may contradict his own principles, yet in the end, his conscience was clearer than if he had chosen otherwise. For in the end, no matter what happened, he did not betray his own heart.

And now, the man's son also had a daughter, adopted, just like he was, and she was now following the same path which he had followed in life.

This is the story of that girl. The girl who had nothing and was nothing at the beginning, yet managed to find love, as well as a reason to live and keep moving forward, on the path which she had chosen to take, without once stopping, without once retreating, with no intention of giving up until the very end.

xxxXXXxxx

The Legend of the Once and Future King of England has had many versions and variations. In all of them, however, King Arthur had always been depicted as a man. As far as a certain blonde-haired woman was concerned, however, she knew with certainty that that part of the legend was false.

As to how she was sure? Well, that is because she is, or was, Arturia Pendragon, now Arturia Emiya, the, or rather, the former King of Knights, and is now married for ten years to Shirou Emiya, the man she fell in love with.

During her time as the King of Britain, she had done her best to be a good ruler, and did everything in her power to protect her country. Even though she was a woman, she was as perfect as a King could be. However, the more perfect she was, the more her subjects distanced themselves from her, seeing her as someone who does not understand human emotions. And it was this which eventually led to the fall of her country.

In her dying moments, she sought a contract with the world, offering her service in exchange for acquiring the Holy Grail so that she can make a wish, to redo things. She wanted to turn back time and go back to where it all began, and she was actually contemplating on whether to try and become a better King or to refrain from taking up the throne altogether.

When she was summoned to the Fifth Heaven's Feel Holy Grail War, however, she realized that her wish was wrong. Resetting the past would not do any good, as it would only make the sacrifices of the knights who had remained loyal to her to the end become in vain.

And aside from that, she had fallen in love with her Master, the person who had convinced her to drop her foolish wish.

Dropping her desire to undo what has already been, Arturia wanted to stay with her Master, but due to certain revelations, which include the true identity of the Grail she was seeking, which was nothing but an evil Vessel that will destroy everything around it except the winner, she had thought that it was an impossible dream.

With great toil and effort, she managed to defeat Gilgamesh, the King of Heroes, by matching his EX rank offensive noble phantasm, Enuma Elish, with her Avalon, Excalibur's sheath, which is an EX ranked ultimate defense, while her Master, Emiya Shirou, confronted and defeated Kotomine Kirei. And with their two greatest adversaries gone, they finally managed to destroy the Holy Grail.

Having spent all her mana in the fights that ensued, including the energy from her Master's final Command Seal, the King of Knights thought that it was over for her, and while she was sad at the parting, she accepted it without regret, and with her wish to seek the Holy Grail gone, she would have finally been able to find eternal rest in Avalon, the final part being the same as the ending that was told in the legends.

At least, that was what she expected to happen.

As far as Arturia was concerned, however, the only part of the legends that still holds true was only up to the part that she was mortally injured by Mordred.

The stories about the Death of King Arthur had practically remained the same. According to it, Bedivere, after two acts of disobedience, finally obeyed the King into throwing the Sword Excalibur into the water, effectively returning it to the Lady of the Lake.

But there was one. Out of all the versions of her legend, there was one, which was not paid much attention, but which also happened to be the closest to the real turn of events.

According to this version, which Arturia herself had read, while Bedivere carried King Arthur on horseback, the King suddenly vanished into a green ball of light and was taken somewhere that was beyond the realm of the world.

A most accurate account indeed.

"?!"

Suddenly the blonde-haired woman felt tense, as she heard a breaking sound coming from one of the rooms in the house.

Moving as quietly as she could, the former King of Knights, who was now a housewife, gently got out of bed, careful not to disturb her son, the nine year old boy who was sleeping beside her, from his slumber.

For a fleeting moment Arturia thought that it was a burglar who had come to rob their house of valuables, but the next moment she shook off the idea, remembering that the Emiya Residence had a Bounded Field which serves as an alarm against anyone who enters their home with malicious intent.

When she finally determined the source of the noise however, she could not help but feel a sense of dread, as a chill started running down her spine.

True, the source of the noise was not a burglar or an evil element that wanted to do harm to her and her family. In fact, it was nothing but a broken cup, and normally should not have been the source of any worry.

If only it did not turn out to be her daughter's favourite cup.

And that fact turned the former King of Knights into a very worried mother.

xxxXXXxxx

It was a normal and uneventful night like always in Paris, France. The sky was midnight blue, dotted by the stars which were still visible despite the number of artificial lights which were scattered throughout the entire city. In the distance you could see the Eiffel Tower, one of the seven wonders of the world.

In one of the abandoned buildings in the less populated area of the city, something which was far from normal and uneventful was happening. In the darkness of that unused placed, a party was ongoing.

However, it was not your typical party, not a birthday party, not a reunion, nor a wedding reception. The closest kind of party to the one which was being held was a funeral.

Except that unlike a funeral, in which a number of living people would mourn for the death of one or two individuals, all of the people who attended this particular party were already dead. Mindless, rotting, walking corpses, that know nothing but thirst and hunger, only existing to instinctively kill and destroy, to prey on consume the blood of all living beings within their reach, with humans on top of the list.

"Come, my loyal minions. Allow me, your master, to feast upon the fruits of your labor!"

As well as to deliver the blood which they collected to their master, a Dead Apostle, a vampire of a much higher calibre, the one who is overall responsible for turning the innocent living humans into mindless corpse puppets.

The Dead Apostle was pleased. Three hundred of his slaves that were filled to the brim with blood was indeed quite a haul, with many more to come, and even more would soon rise. Having just freed himself from the one who turned him a year before, compared to the Dead Apostle Ancestors, he was nothing but an upstart, that much he knew. Still, given time, by consuming more blood, he would become stronger. He knew it would probably take another year, a decade, or perhaps even a century for him to feel the effects, depending on how much blood he can collect, but it did not matter much to him, for being an immortal, time was his friend, not his enemy.

He may still be weak in comparison to the Ancestors, but he was more than capable of dealing with a normal human being, his strength greater by a hundred fold. With the power he owns, and with the army of undead under his command that was growing larger with every person that become their victim, someday he would have enough power to take over the country, and perhaps even the world.

These were the kind of thoughts that was occupying the mind of the vampire, before a sword shaped like a corkscrew pierced through his heart and exploded, killing him almost instantly, his scorched body parts flying in every direction, beyond recognition.

xxxXXXxxx

Louise Francoise Le Blanc de la Valliere is a failure as a mage. She was a genius when it comes to theories and written exams, but when it comes to application of magic, she was useless. Completely and utterly useless.

As had been taught to them by their teacher, there are four base elements: earth, fire, wind and water. Naturally, due to their particular affinities, most students are unable to cast all the spells properly, due to elemental affinity and compatibility.

In Louise's case, however, despite being proven to possess magic, she could not cast a single spell properly, not even the basic ones like Silencing Spells that do not require any affinity and can be cast supposedly by anyone, needing only magical energy.

Whatever spell she tried to perform, simple or complex no matter how she tried, she always ended failing. Sometimes, the spell she would use would not do what it was intended. At other times, nothing would even happen. But worst of all, most the time that she tried to cast even the simplest of spells... it would end in an explosion.

Thus, her zero success rate at magic has earned her the nickname 'Louise the Zero.'

"You may begin."

"Yes, Professor Colbert."

And now was her last chance to prove herself as a mage. Her written exams may have been enough to pull up her grades to allow her to pass every subject, but unlike the other tests, succeeding in the Springtime Familiar Summoning Ritual was a requirement for her to be able to move into the second year. Otherwise, she will have no choice but to leave the school as a failure.

"My servant who resides somewhere in this vast universe! My divine, beautiful, wise and powerful servant heed my call!

Focusing all of her magical energy, ignoring the taunts and snide comments coming from her classmates, the pink-haired mage started chanting her spell one more time.

"I wish and assert from the very bottom of my heart, Answer my guidance and appear!"

xxxXXXxxx

"Target eliminated. Initiating cleanup procedure."

From her lookout on top of one of the fancy hotels in Paris, a girl with pink hair and who was wearing a red overcoat stated the success of her mission, although it was to no one in particular, as the bow she held in her hand vanished, replaced by three moderately long, thin blades: Black Keys.

She is an Executor of the Church, the youngest female to have joined the Burial Agency ever since its formation, as well as the second youngest member to have joined, second only to the former member and now deceased Kotomine Kirei, who became a member when he was only ten years old. She joined about two years ago, when she was only fifteen years old.

Being a prodigy when it comes learning, at least the knowledge and theoretical part, she was able to finish her secondary education when she was only nine, and when she was eleven, thanks to the advanced method of schooling known as Distance Learning, she had already graduated from college by taking an Online Learning Course offered by a respectable university. Had she really wanted to, it would have been possible for the young pink-haired girl to take on many kinds of profession, and she could have also chosen to go on and study at the Clock Tower in London, the area which is used as the main base and stronghold of the Mage's Association.

Magecraft or thaumaturgy, the artificial re-enactment of a mystery, or in other words, the ability to perform a miracle, to make something believed to be impossible possible. This was an ability which she possessed. Basically, despite all her hard work at studying the concepts and underlying concepts, despite understanding them by heart, the pinkette was no good at application. Every single time, no matter how hard she tried, most of the spells she cast, instead of simply not having an effect, would end in an explosion. That is, of course with the exception of five particular spells. And it was her prowess in these which would have caught the attention of the Mage's Association, although she never joined.

Despite her constant and open use of magecraft, she had been allowed to join the ranks of the Executors. She may use magecraft as her primary method for offense and defense, but when it comes right down to it, her ideals and beliefs ironically coincide much more with the Church than with the Mage Association.

Forty-six. In the two years that she had served as an Executor, the pink-haired girl had already killed forty-six heretical and formidable magi, not counting the five which she killed before joining. Each of these magi had their own unique abilities, yet these powers they have had not been able to save them from death by her hands.

And thus, just like her adoptive father before him, she had been dubbed as the Third Magus Killer.

Most of the undead she had met, with the exception of two vampires and one of the three Dead Apostles she has eliminated, did so only out of the need to survive, out of necessity. Most of the mages she met, on the other hand, hurt humans even though it was not a requirement for them to be able to continue living, using them for their research and experiments, not to mention that they themselves were also human.

Magi are worse than monsters.

Such is the belief that is held by the young pink-haired member of the 8th Sacrament. She may have hunted down and killed several undead and vampires, including three Dead Apostles, but when it comes right down to it, she never hated them as much as she did mages, for most vampires were also victims themselves. Most of the magi she met that abused their power and hurt innocent people, however, do not have this root as an excuse, only blaming it to tradition, which to her, was not pardonable. Thus, whilst she was willing to give Dead Apostles a swift and painless death, she was not so inclined to give the same courtesy to the mages she hunted down. The only reason why she never tortured her victims even if they are mages was because of the chance for them to retaliate. After all, the result of a death match is unclear even one side has the clear advantage until it is over, so it is always best to dispose of the enemy as soon as possible.

When it comes to capture missions though, the young pinkette took the time to torture and break them until they confess and spit out the information she requires, after which they are made to suffer a slow and painful death, unless they are still needed alive even after the information has been extracted.

The vampires and undead, on the other hand, she would give them a swift and merciful end.

"May God have mercy on your soul," the girl said to the mindless creatures in front her, before throwing half a dozen Black Keys at them, which burned and incinerated the walking corpses the moment the weapons made contact.

Having scanned the building using Structural Analysis, she knew that she was greatly outnumbered.

Three hundred against one? Good odds for any Executor. The young girl thought inwardly with a smirk.

Killing a hoard of them would definitely take time, but so long as there is no vampire or Dead Apostle among them, handling even such a large multitude was a piece of cake.

"Trace on," the pinkette whispered, and almost instantly, two spears, one blood red, the other golden, appeared, the latter slightly shorter than the other, both of which feeling at home in her hands.

The girl charge towards the multitude of living corpses, wielding the spears in such a way that only an expert at using them could do, and with her skill at using the long weapons, the young Executor began her execution of the walking dead.

In a short amount of time, which was less than a quarter of an hour, the pinkette managed to eliminate the entire legion.

"Mission accomplished," the young female Executor told herself, dematerializing her weapons, as she allowed a small sad smile to grace her lips.

Despite the fact that they were already nothing but mindless zombies, even though she was able to control her emotions, the fact that she lived to slaughter those which were once human still shook her heart. However, the thought that what she had done ensured that her actions helped saved innocent lives brought her some comfort.

Satisfied with the result, the young Executor proceeded to wipe the dust from her clothes and jumped out of the window, as had become her habit.

"?!"

This time, however, instead of landing gracefully onto the pavement, the young pinkette, to her horror, found herself falling straight for something other than the ground.

A distortion.

Sensing the danger she was in, the young Executor immediately tried to jump away.

But it was too late to change her trajectory, an error on her part that was caused by a moment of carelessness.

Crap...

Realizing that there was nothing else she could do, Emiya Sakura, the adopted daughter of Emiya Shirou and Emiya Arturia, braced herself, Reinforcing her body as much as possible, trying to keep her balance as she fell into the large green portal that had appeared out of nowhere, a portal which for some reason, felt strangely familiar, as if she had already had the same experience once before.

xxxXXXxxx

To be continued...

AUTHOR'S NOTES

Alright, this is the first chapter for my new fic, my first ever Fate Stay Night and Familiar of Zero Crossover, entitled Fate Zero: The Sword of Akasha, and I wrote this out of an inspiration I got from reading Gabriel Blessing's Platinum works, namely 'In Flight,' and the 'The Hill of Swords.' And before I forget, I should also mention that this idea came to me completely after I read the attempt at a continuation of 'The Hill of Swords' called 'Double Zero', in which Louise summoned... herself.

These three crossover fics definitely inspired me. My story though will have a completely different concept.

Now, this story, as you may have noticed, may seem to have an OC, but no, it does not. In fact, this story, while not blaming Zelretch directly, will make use of the theory of the Kaleidoscope. Louise Valliere and Sakura Emiya (not Sakura Matou), I'm sure you can already guess the connection between them, and it's somehow similar to Shirou and Archer.

Since this is only the beginning, not everything is clear yet, but don't worry, everything will be slowly explained and (the elements, abilities, the reason why this is like this, that is like that, etc) will come to light as the chapters progress.

And for those of you who are wondering, yes this story also makes use of an altered Fate Route ending, in which something happens that ends up with Saber managing to stay after destroying the Grail, although like I said a little earlier, everything will be explained in due time.

Also, in this story, there is a 50-50 chance that Saito will appear, more likely as the familiar of a certain half elf. I'm not promising anything though, since even though I like Familiar of Zero in general, I do not like the main characters that much, and in fact, if I were to pick a favourite character or two, it would be Tabitha and Kirche.

But enough about that...

And like always, I hope you enjoy reading this chapter...

Later then, people...