[Fate / Stay Night & Tsukihime Crossover

[Shirou x Saber, Rin x Archer and an extra fictional pairing

Disclaimer: I do not own Fate / Stay Night or Tsukihime. Only the new character in here is my own. If the same name would appear in other works other than my own, it would be just pure coincidence.

This is my first time to post a fanfic and I hope it goes well with your tastes.

Chapter I: An Alteration

"Fulfil your duty." Shirou Commanded Saber to destroy the Holy Grail, using up his last Reiju.

"Ex…" Saber charged up her Noble Phantasm. Before she could release it, a dying Kotomine Kirei intervened.

"No! I won't fail this time!" Kirei ran as fast and as far his legs would carry him. "I wish for all the evil in this world!"

Even in an incomplete state, it would seem as though the Grail would grant that wish. Saber would not let that happen.

"…calibur!" As a dark ray was released from the Grail, a golden one was released from Saber's sword. Kirei was right in the middle of the two rays of destruction. As they collided, Kirei knew the mistake that had happened. He tried to shout as he painfully began to shift out of existence.

Meanwhile, the two rays merge into a huge silver ball and exploded.

"What just happened?" Shirou asked Saber.

"I do not know." Saber replied. "But it seems that this war is far from over." Saber could see that the Reiju on his Master's wrist is being restored.

As they spoke, the silver supernova imploded into a red and blue energy ball and headed for the school. Saber began to chase the magic ball.

"Stop, Saber! It's to fast!" Shirou said as he grabbed Saver's arm.

Before they knew it, the ball exploded above the school grounds. Without second thought, both Servant and Master ran to the scene. It took them a while to get there. They heaved a sigh of relief as they entered the school gates. Everything was fine, aside from a huge magical ball exploding overheard just a few moments ago.

"It's a good thing that the school's close." Shirou gave a sigh of relief. "I think we need to head home and inform Tohsaka."

They arrived home and found that Rin had already treated herself. They told her everything that had happened.

After almost an hour, Sakura came barging into where the three were. She was almost out of breath."Senpai, I need help. I passed by our school today and I saw a student coming out of the gates. There was…umm…'something wrong' with him."

"I think we should bring him here." Shirou suggested.

"Nani? Why would you bring a total stranger into this house?" Rin objected.

"I agree with Rin." Saber interjected. "It is not wise to just let it strange people in this house."

"Demo," Shirou interrupted. "What happened to him may be related to what happened at the school."

"Alright." Rin finally agreed. "Just don't take too long...and take Saber with you."

After a short while, they managed to bring in the student to Shirou's house. Rin began to analyze the wounds that he had received maybe prior to the said 'incident'. The student had long white hair. He had almost the same physique as Shirou. She could feel magic within him. There were many silver stains on his clothing. Then it hit them…those silver stains were his blood.

"Aren't you going to treat him, Tohsaka...Tohsaka?" Shirou called out to Rin, who was staring at the student.

"There's no need. Look!" Rin pointed out. The wounds were healing almost instantaneously. It's as if the wounds were reversing themselves. He began to cough and opened his eyes. He got up and looked around the strange faces in front of him. Everyone was staring at the visitor. No one was making a sound.

"I'm going to make dinner." Sakura decided to break the ice.

"Umm…right…By the way, I'm Emiy—"

"Emiya Shirou…" The new guy interrupted. "Gomen nasai. I have this strange…umm…'skill' in finding out people's names."

"I see…" Shirou responded. "Well, I'll formally introduce my other friends—"

"Tohsaka Rin and Arturia Pendragon…" Their visitor involuntarily interrupted again. "Sorry, it's kind of an annoying reflex…rgh…"

He clutched his right hand. It seemed to be burning. They clearly saw a Reiju being ironed on the back of his right hand.

"It seems as though the war had began all over again." A voice behind them spoke. A very familiar voice.

"A-Archer?" Rin stuttered upon seeing her previous servant automatically being summoned.

"Don't tell me you missed me?" Archer said with that smug sarcastic look on his face. Rin just turned away from everyone else before anybody can see her blushing face.

A scream arises from the kitchen. They opened the door and saw a servant summoned for Sakura. A man in white mage robes. A man familiar to Saber. A Caster class servant whose past was…

"M-Merlin?" Saber said in shock.

"Arthur?" Caster replied. "Hmmm…this is getting a little interesting."

"What business do you have as a servant, Merlin?" Saber asked in an intimidating voice.

"Simple." Merlin smiled. "To destroy the Grail."

"Then I guess we'll all have to work together to do that." Archer said coolly.

"Unfortunately, not all servants have that goal." Merlin said as he conjured up an orb. "Not far from here, a servant of the Lancer class has been summoned. She appears to be from the ancient times of Scandinavia—"

"She's a Valkyrie." The new guy interrupted. He could barely stand up.

"Can't you find some other use for that ability rather than annoy people?" Rin asked. She tried to deny the fact that someone was a bit smarter than she is.

"Tohsaka, take it easy on him will you?" Shirou told Rin.

"Maybe he could be of some assistance" Saber said. "Maybe he could identify the other servants."

"I'll be glad to help you with that." He smiled. "Just show them to me."

Merlin showed them an Assassin class servant who was identified to be Sinbad of the Seven Seas. The Berserker they saw was luckily not Hercules but Hector of Troy with another Master. The Rider had been found out to be War, a horseman of the apocalypse.

"That's unnatural." Merlin said. "There seems to be an eight servant being summoned."

"I think that's mine." The visitor told them as his servant began to materialize behind him.

"Servant Avenger, Master." The servant had a childish smile across her face. She had a blond hair up to her shoulders. She had these blood red eyes which would look really terrifying if that creepy aura had not been cancelled by that childish attitude of hers. She wore a long-sleeved turtle neck and a knee-high purple skirt. "I didn't think we'd see each other again…Rei…" She smiled again.

"I didn't think so too…Arcueid…"

Well, I hope you liked it so far. I'll try to add the next chapters as soon as I can ok? Please read and rate. Thanks, and by the way, Rei's full name is Hono Rei XIX…yes, that's my pen name…I'll be posting a fanfic in the Tsukihime section about his past with Arcueid…