Author's note: Here is the prologue. I'm going to make the average first year students at Duel Academy start as 15 year old. This is mainly due to Zane who seems to be at least 17 years old to me when he graduated. I personally think he's 18 when he starts dueling in the Pro League.
Disclaimer: I do not own any of the Yugioh franchises or Fate/Stay Night.
Prologue
Peace could be found all over the world despite violent conflicts that happened in different places from time to time. Peace could be found in people just going about their daily lives not minding others. Peace could be found in one person busying with a favorite activity. Peace could be found in a person simply being happy for a moment only. There is one moment where someone's peace is about to be ruined.
A boy of 15 years old can be seen sleeping peacefully, unaware of the world going about as usual. The boy has short and slightly spiky red hair which remained to be his only defining aspect in his appearance that sets him out from the rest. The appearance can be seen as normal. Snoring peacefully, he is unaware of his approaching predator.
The predator has a small shape and creeps nearer to its target with silent footsteps. It has a mischievous glint in its red eyes. The hunter let out a small smirk.
The hunter inhaled a deep breath before letting out one whisper.
"Wake up, onniiiiii-chan!" The hunter tackled the boy.
Well a whisper as quiet as it can be for this little hunter anyway.
"Wha-oof!" The boy cried out in surprise, not wincing in pain the slightest due to having grown used to it.
The boy finally opened his eyes and looked at his grinning attacker. His attacker had an appearance of a girl with distinct fair skin, white silver hair, and red eyes. She looked to be not that much younger than the redhead. The girl in question is 13 years old and wearing her favorite pink pajamas.
The boy sat up straight and groaned from the unwanted wake up call. He rubbed his sleepy eyes until the drowsiness is almost gone from them.
"Illya-chan, must you always do this?" The boy admonished her lightly.
"But, Onii-chan I want to give you your daily wakeup calls from your most adorable little sister. You wouldn't deny her that would you?"
Illya looked straight at him with the most dangerous weapon known to mankind everywhere.
The puppy dog eyes, you'd have to be a completely heartless person to be able to resist them!
That or the person in question just doesn't care about the puppy dog eyes at all which is quite rare.
Unfortunately, this boy is neither such person and as expected he broke down stuttering in response to her sister's dirty tactic. The boy is a sucker for his little sister's cuteness as she pretty much gets him to do anything.
Which pretty much make him her slave in all but name, but nobody needs to know that do they?
"Umm… no?" The boy said unsurely.
Satisfied with this, Illya got off of him with a cheerful smile. "By the way Shirou, mom and dad are waiting for you downstairs. Breakfast is ready!" She told him.
"Did dad cook?" Shirou asked hesitantly.
Illya shook her head amusedly and chuckled. "No onii-chan, mom would never let dad try to cook again, especially not after what happened the first few times."
Ah, their father is a very skilled professional that receives job offers with generous salary every now and then. Unfortunately, one of his skills did not include cooking. Not even the most basic form of cooking can be accomplished by him. The best he could do was make coffee which he needed a lot for a certain line of work.
His name is Kiritsugu Emiya.
The first time, their father tried to cook for the family, everything was a disaster. Somehow, pieces of the food he attempted to cook got stuck in the microwave itself for unexplained reasons. Second time was a disfigured piece of meat that became alive somehow and tried to grab onto their mother. It was swiftly executed by its intended target within the blink of an eye.
No one dared to look at the smiling face and closed eyes of the scary mother.
Third and last time attempt was rice with chicken. It was burnt to pitch black within seconds. After that, it became a house rule that he will never attempt to cook under any circumstances much to his embarrassment.
It was a good thing Shirou seemed to pick up cooking along with his mother and one of the maids. Turned out, the redhead had a hidden knack for the culinary arts with enough practice. He was the unofficial head chef of the family.
Oh yeah, there happened to be two maids that work for the family, but pretty much treated as part of the family due to certain origins. The maids are Sella and Leysritt. Apparently, they are part of the very same family that their mother, Irisviel von Einzbern, came from.
A noticeable thing about the maids, Irisviel and Illya is that they all look similar in appearance. They all have white silver hair and red eyes. It's odd for even relatives to have such striking similar appearance, but Shirou learned quick enough to ignore it.
Such detail isn't that important anyway. Well, too most people that is.
"I'll be down there in a minute Illya. I'm just gonna stretch a little bit."
His sister nodded in response and skipped happily out of the room.
Shirou stretched his arms and legs to get his whole body awake from a good night sleep.
He promptly went to the bathroom and washed his face in water. The young teenager went down the stairs to the living room for breakfast.
"Good morning, Shirou." His father greeted him before sipping his coffee.
The man had an appearance of that of a Japanese man in his early thirties with a body very well in shape for strenuous physical activities. He has black spiky hair, dark eyes that could be described as black, and wore a normal gray yukata.
To Shirou, he noticed that there seems to be a light in his father's eyes that is surrounded by a feeling of emptiness when he had first met him.
It wasn't until some years later that he discovered a rare trait in himself that Kiritsugu opened up to him about certain topics.
"Hurry, up and eat your breakfast Shirou! Eat it while it is hot." His mother greeted him.
Irisviel looked very much like an older Illya with long straight hair. She looked to be in her mid-twenties and possess beauty that would easily make lesser women envy. She is wearing simple casual clothing.
Illya can be seen sitting next to her while happily munching on her food. Opposite from Kiristugu, sat two more females who looked around Irisviel's age. Sella has her hair tied in a pony tail that reached just below her neckline and Leysritt has short hair.
Another difference between the two maids regarding appearance is that Sella's eyes seemed to express her as a strict woman. Leysritt's made her expression look blank despite her casual personality. There is one more difference which is that Leysritt is more… gifted in the chest area than her fellow maid.
Sella pointed Shirou toward the food set for him.
He obliged and sat down with the rest of the family.
The family had a small chat over normal things like the neighbors' pets making a ruckus or Illya's description of her time at school.
Times like these made Shirou grateful for being part of the family.
He is not actually a biological son of the family as his appearance pointed out.
He was adopted since 10 years ago after a tragic incident occurred.
It was the Great Fuyuki Fire as the tragic event was came to be known as.
There were very few survivors that numbered in a few dozen out of about 500 hundred people. He is one of them. What set him out from the rest of the survivors was that he was found near the center of the inferno.
Everyone else was found on the outskirts of the event.
He lost his family, his memoires, and almost his life too.
However, that doesn't matter. The family treated him as one of their own and he returned the feelings in kind.
It was puzzling to many people how he survived, but Kiritsugu and Irisviel knew how.
The answer was what the boy had in his possession though he had no idea how they came to be on his person. Even if he lost his memories of person he was, he was sure that they weren't supposed to be there in the first place.
What made it strange was that he could remember the event clearly, yet the event was distorted into a blur. He was awake and remembered every detail of the fire, but he could not remember it truly after his rescue.
It was an odd feeling that he couldn't help but fell that there was something else to the event.
His father told why the fire happened, or at least what he believed how it happened.
The fire was the result of a dangerous and forbidden experiment that many have tried thousands of years ago, but they all failed.
He was told due to his odd ability that not many possess.
Duel Spirits.
He could sense spirits like the rest of the family as evident to what he had in his possession after the fire.
They were Duel Monster cards.
It came as a surprise to the entire family, but Illya was excited at having an older brother who was like her.
Another odd thing was that Irisviel, Kiritsugu, Leysritt, and Sella could do the same thing as well though the latter two don't play the famous card game anyway.
Kiritsugu told him that he learned about his own ability to sense these spirits from an old friend who was aware of these cases.
Shirou also learned that it was a common trait in Irisviel's family though the reason why remained hidden from him to this day.
Anyway, the family finished their breakfast as Sella went to clean up the dishes and Leysritt helped Illya prepared for school a bit.
Shirou noticed that his father pulled out a folder from under the table and placed it on top of the furniture. His wife sat by him quietly.
"Shirou, there is something that I want to speak with you about this." His father spoke with seriousness in his voice.
Shirou's back straightened as he knows what business this meant. "What is this about?"
The man handed his son the folder.
He took it and opened the folder as he carefully looked over its contents.
His eyes widened a bit at a specific piece of information.
"Dad, is this related to that incident?" Shirou questioned his father.
"It's not directly linked, but it's too similar to be a coincidence. A colleague of mine went there to investigate, but was told to leave the island when he got too close to the location. He did however, managed to get a dark feeling of something that shouldn't be there. He never got to the source, but it was enough that a similar occurrence happened." Kiritsugu explained to him.
"Shirou, this is your decision if you want to do this. I don't want my son and Illya's only brother to get hurt, but I have faith in you if you feel resolute in doing this." His mother said to him serious as her husband, but with a motherly tone.
"Besides, even if you take this task on, you won't be alone. Later that is, I have to settle some findings with a friend in London before heading over to there and help you with the investigation." His father stated.
Shirou looked over the contents one more time placed the folder close on the table.
There was only one answer for him.
Inside the folder was the picture of an island with a large building that people recognize its importance for the three colors that could be seen on the front of it.
Blue.
Yellow.
And lastly, red.
Inside Shirou's room, sat a deck of cards with one face up on top, there is an image of a young blonde girl in regal blue dress and armor.
A faded image of her could be seen sitting on the bed patiently.
Notes
Many things from Fate/Stay Night will be altered to mirror the original in some ways.
One example is the Fuyuki Fire and its causes. It will be explained a little more in details at some point.
Characters coming into this story will have Rin Tohsaka and Souichirou Kuzuki. Sakura Matou is still up for debate. If she is in the story, she will remain in the Tohsaka family since magecraft doesn't exist in this world. I'm pretty much not bringing any other characters at this point except for one certain girl that would make Shirou's life comedy hell for her own amusement.
I'm still debating whether Servants will be ritual monsters or not. I do want them to be easily playable enough so that Shirou will be using two main Servants for a duel at some point. Can you guess which one will be Shirou's second Servant in this future duel?