Regnum Caelorum et Gehenna

Built thyself and scrape the heavens!

Mark this place with my supreme brilliance!

Aestus Domus Aurea!

-Saber ; Fate/Extra

Hello everyone, this is my first fanfic so I'm please if you can criticize or share some opinions with me.

Anyway this is a Crossover between Detective Conan and Fate/Extra.

WARNING: might contain some OOC-ness, mild gore and slightly but not AU,
and sorry for some grammatical errors, my English is not really good but at least understandable XD

I skipped the start of DCM6 since most of us already know the beginning and it won't be related in this fic anyway.

Disclaimer: Detective Conan is owned by Gosho Aoyama and Fate/Extra is owned by Type-Moon.

Saber (Arturia) is owned by ME!..Ok I'm kidding. :P


Light flashes inside the Beika City Hall indicating the start of the game, with Noah's Ark controlling the game system, the adults are worried about the safety of their children. Little did they know that an unexpected event is going to happen. Among the audience is a middle-aged man sitting in the far left corner with a huge smile on his face. The said man is wearing a black and bluish gray coat (A/N: I forgot what colour he's wearing :P), which shows that he is a priest. The man began to murmur something. "It's time for this game to be more interesting."

"Damn that computer jerk! I'm going to disassemble computers like him once the kids are free!" Mouri Kogorou, the famous sleeping detective, shouts with pure anger while staring at the computer screen. Noah's Ark has gain control of the game system and now the children's lives are in danger. "How is it Professor?" Kudo Yuusaka asked the old man, "I'm trying my best to get access inside the game so that we'-"

SCREEEEEEEEEEEEEEECH! The computer makes a loud noise which makes everyone jump out of shock inside the room. "Wha-what is this?!" the Agasa Hakase was shocked to see that Noah's ark has SHUTTED DOWN ITSELF! and while a new data is taking over it. "How is this possible? The kids, what about the kids?" Yusaku said as he saw what was going on but still kept his poker face. "The kids are okay; I don't see anything wrong with them, but this data..." the professor show the data to everyone. "This is...SE. RA .PH? What is that thing, is it a virus" Kogorou asked with a very confused face. Yusaku replied "No we don't know what is, it does appear like a virus" "Then let's save Ran and the other children before the virus-"

"don't worry the kids aren't in danger" Kogorou was stopped midsentence when someone suddenly spokes. It was a priest, they didn't notice him went inside because of what's happening. Yusaku asked him, "How sure are you that the kids aren't in danger? And...Who are you?"

"who am I?" The priest with emotionless cold eyes replied, "I am Kotomine Kirei, and I am sure that the kids are okay, In fact they might already be enjoying themselves inside the game." He smiled. "Enjoying...could it be that"

"Yes" Kirei replied, "Since I am one of the people involved in hacking the Cocoon, we decided that instead of those boring 5 stages, we replaced it with a more enjoyable game"

"and what type of a life-threatening game is that!?" Kogorou's not pleased with the guy.

"Are any of you familiar with the Holy Grail War?"


(Inside the Cocoon)

"What the heck's happening here, just now I'm with Ran and the others chasing Jack the Ripper , then suddenly there's a very bright light and now I'm inside the church and alone!? Just what the- wait, I must calm down so I can think properly about this." Conan talks to himself while thinking what's going on. When they are about to start the game, a shot of blinding light covers all of them and suddenly finds himself alone. He was so busy thinking that he didn't notice his surroundings until he heard a human's voice.

"Welcome potential master"

The voice comes from the ceiling of the church. "a person?" suddenly a clanking voice turns Conan's attention. He stares at the shadowy figure that looks like a human(?), it comes closer and closer, sensing that it's something dangerous, he ready his stun watch only to realize that Hakase's invention is not working inside the game. "Damn it! What should I do...what should I do" Conan decided to step backward only to notice that the human is actually...a mannequin? Nope, It looks more of an effigy than a mannequin. "Huh? What? Is that thing?" He asked himself with a dumbfounded face. The effigy's just stand there in front of him. He decided not to move just in case the effigy does something scary but after one minute, the effigy's still not moving. Finally relaxed, Conan decided to just ignore the bizarre thing and check if the church has an exit, when suddenly he heard the clanking noise again, but now it's getting closer to him only to realize that the effigy is running towards him! With its sharp pointy hands, it's going to stab him, Conan tries to dodge but it's too late, the effigy slashed him down.

"Hmp...You seem to be lacking as well"

"I've heard the voice again...so I'm still alive huh?" Conan clutches to his chest while trying to stand up.

"The time has come. With your inevitable loss, I will consider this round of preliminaries over"

"loss? Preliminaries! don't really get what's he talking about, and why am I here in the first place, I'm only supposed to be...argh!" Conan can't bear the pain in his chest, he was slashed by that effigy for unknown reason but still there's no blood coming out.

He's too focused with the pain in his chest that he didn't noticed the voice is still talking.

"—Farewell, I pray you'll find peace in your annihilation"

"I see...that weird thing is really meant to kill me. Dam it! I can't accept this!" Conan begins to protest and tries to stand up, ignoring the pain in his body. "I'm not going to die here! I need to save the kids that get involve-that's right! Genta and the others must be somewhere, I must find them, I need..." Conan's vision starts to be hazy, " Da-damn this, I need to warn them, this place is dangerous..I must stand up!" He gathers all his strength in an attempt to get back on his feet but as he tries to move, an unbearable pain shoots through his entire body. He can't do anything, he's body began to paralyzed and for the first time he starts to be afraid. He was afraid of losing his senses and afraid of becoming a corpse, and most of all,

He was afraid of leaving Ran alone.

"R-Ran..." suddenly an unknown strength courses through his body when he remember her, her warm smile and kindness. He promised Ran, he will come back to her and won't make her wait anymore. It's not right for him to die because of just a simple game. He tries to stand up, he doesn't care about the pain anymore, as he uses all his strength he was able to at least raise his body when suddenly...

"Indeed! You must embrace your fear and fight on regardless what fate may await you."

"—Well spoken, nameless traveller! Even if the world will never hear of your desire, know that I admire and respect it!"

"Close your hands into fists and raise up your head! Your end has yet to come!"

"In fact, your destiny begins now!"

"A voice, this time it sounds like a young woman" Conan was astonished on what the voice said to him, although there's still something he don't get at all... his destiny?

A sound of shattered glass suddenly surrounds the air, along with some pretty dazzling lights that emits at the center of the room.

Suddenly, a young woman appears out of nowhere. She's wearing a long red gown and stands so proudly of herself. The said woman has a very beautiful blond hair and emerald eyes, she approach him and helps him stand up, still grabbing his left hand, a sudden warmth, then a sharp pain was felt by Conan, she let go and he stares at the back of his hand only to notice a red symbol which looks like a tattoo with a very strange symbol.

Confused, Conan stares at the mark then looks at the lady in front of him when suddenly a familiar clanking voice is heard.

"The effigy!" Conan exclaimed with a bit of a panic on his voice, the effigy is in a fighting stance. "Looks like it sensed that I'm still alive, what should I do?" panic rises through him when suddenly the lady touched his shoulder and smiled at him. "My my, what an excitable master do I have, why are you so flustered?" Why won't he be? That thing almost killed him. He flinched by what she said she called him, master.

"While I am by your side, have no fear that you may lose. Remember, victory is all that matters." The lady keeps talking with a very proud voice, as she walks near the effigy she released a long red sword with a shape that resembles a flame.

"My blade is the ultimate instrument! Even the muses themselves would bow before the sound it makes" she says proudly as she waves her sword elegantly. "a sword, but its shape is very odd" Conan remarks when suddenly the effigy rushes through them, the lady raised her sword and slashed it with one hit. The effigy was cut into half. "Awesome" Conan can't help but be amazed; the threatening effigy is now destroyed. It's all thanks to the lady in red. However looks like the lady is not satisfied.

"That wasn't entertaining at all. Considering how long I've waited for this moment, I'm not satisfied" The lady pouts as she was not contented of her enemy.

"..." Even though he was amazed, Conan can't shake the feeling about the lady killing someone (something?) The lady's still babbling something but Conan cannot understand it clearly as he's starting to lose consciousness due to the pain in his left hand.

"The mark imprinted on your hand is the command seal. It is proof that you hold dominion over a Servant. You can use it to give three orders that must be obeyed. Think of them as disposable strengthening spells."

"It's that voice again" Conan, still half-awake heard what the voice is telling him. "So this weird symbol in my hands is called a command seal..." he looks at his hand with a slightly confused look, for some reason he really cannot understand what's going on, everything sounds weird.

Nevertheless the voice continues to speak,

"It's also proof of your participation in the Holy Grail War. If you lose it for some reason, you WILL die."

"...I will die? What the!" because of what he heard Conan becomes fully awake. A game where he will really die. It sounds ridiculous.

"I can understand your confusion. But before I forget...Congratulations! You have endured much to make it here. Now rest for a while; you've achieve your first goal."

"Is this really worth congratulating for?" Conan said to himself, but when the voice said "rest" he feels how exhausted he was.

"It was a clumsy effort to say at least, but that's what made it entertaining. I've had this duty for a long time, but this is the first time I've seen a master as helpless as you"

Conan suppressed his urge to kick whoever-that-voice-is in the face for saying he is helpless But he have to admit, he was really helpless that time, if only he can use Hakase's inventions.

"nevertheless, be proud of your achievement. Your quick thinking came as a result of nerves and rashness"

"Now that I've noticed it, the voice sounds like a middle-aged man...around 40 or 30" Conan tries to distinguished the voice, though hiding the fact that his irritated on how smug the voice is.

For some reason he can also imagine that the voice belong to some priest, dressed in a somber cassock.

"Oh, so now you're curious of who am I correct?"

"Yes, who are you?" Conan asked.

"Me? let's just say I'm a part of the system. I am just a guide, tasked in giving message and given the personality of a prior participant"

"I am no more than words, no more than the mountain you just conquered, no more than a record of the past."

"A record huh?" Conan thinks, "So If asked you, like any objections, you won't be able to answer in return?"

"Exactly"

With that, the voice finally said

"Now, let us commence your baptism. You have proven yourself worthy of the honour. Be jubilant, young knight, for the Holy Grail War Begins now!"

"Holy Grail War...I'm quite familiar about the Holy Grail being a dish or a cup related to Arthurian Literature, but as a war? I don't get it at all"

Conan starts to be terribly confused and he didn't like it.

"An object of great power once existed in the world. One that could grant any desire, People call it the Holy Grail and fought endlessly in an attempt to gain soul possession of it."

"-This war, the system you find yourself in now is an evolution of those struggles. You stand at the entrance of a deadly struggle where many magi will perish in pursuit of the Holy Grail"

"Listen magi, had I not bestowed upon the earth desire, you'd be merely saints capable of committing sin"

"magi? He just called me one, why is that...I'm not even a magician like Kaito Kid and Supernatural things aren't supposed to exist" the voice still continues to talk.

"Now fight to till death. The fiery throne of heaven will only receive those with the strongest of desires-"

"fight to death...means I need to kill" Conan finally realizes it.
"No! I won't accept this! There's no way I would kill someone just because of a wish-granting cup!? That's ridiculous" Conan's shout echoes through the room, he won't accept this, he would never be a murderer.

The voice replied "I'm sorry. I didn't know that you're such an idiot, of course, this is a war, and what must people do? Kill for survival right?"

"I..." Conan was about to respond but the voice cut through, "You can't back-out now, since you are already chosen, anyway it's your weapon that's going to do the killing, not you"

"My weapon, like heck do I have one other than my shoes..."still irritated, he listens to the voice anyway.

"In war, a weapon is needed. That is your servant. The spear that pierces, the shield that protects. A Legendary Soul whose purpose is to clear your way to the Grail. That is the one who stands beside you."

Conan tries to converse with the voice, "The one standing beside me, you mean this lady?" he said while glancing at the lady in red beside him.

"She is my Servant?" Conan...still dumbfounded asked the voice.

"It seems you have decided, and with that decision, I will now open the gates to the Holy Grail War"

After the voice said that, Conan's left hand begins to be excruciatingly painful.
"I...can't take this anymore..." Conan said before passing out.


A/N: And now here it is! My first Fanfic evahhhh! As you can see I'm not really good in English (cause it's not my 1st language so I think anyone can understand) Anyone want to know who is the lady in red? (People who are familiar with fate series please don't say a word, cause some may get spoiled ;D) Conan might be a little OOC, sorry about that cause he was kind of hard to write you know, we know he's against killing and murders so I really don't know how to write him here, I'mjust imagining just in case if Conan gets involve into something like this, though I wish it will not . Anyway, some of you (especially Fate fans) who might read this may be wandering onwhy did I chooseFate/Extra? It's simple:

It's easier to connect the story in DC (especially M6)

Fate/Stay Night is based on an electronic Japanese adult visual novel *cough*giggukreview*cough* (I don't want to write any CGI dolphins and arm-biting dragon xD)

One of FSN's main plots is on "how to become a hero", I don't think Shinichi/Conan wants to be one.

Shinichi/Conan is NOT a magi/magus, so it's impossible to summon a servant.

Fate/Extra is a also a Virtual-reality game (same as M6)

FSN is on a real world in Fuyuki City, wherein they will really kill each other (masters & servants), I don't think letting Conan go on a killing spree is ok.

NO Angra Mainyu! (Heck yeah!)

NO Crest worms (those are groooooossss!)

Please don't forget to review or rate, thank you

(sorry for the long A/N)