Disclaimer: I don't own Fate / Stay Night nor the characters therein but my original character, the rest of them are the property of Type-Moon.

Kiritsugu's Other Son

After Saber seemingly destroyed the Holy Grail, the Fourth Holy Grail War came to an abrupt end. Fuyuki City slowly began to recover, but things are not as they seem. With a new conflict impending, the young Emiya will be in the thick of it. Little does he know however, he will have a new and unlikely ally.

Chapter 1 : Prodigal Son Returns, the New War Begins

Inside Ryudo Temple

Caster slowly regained her consciousness and opened her eyes, staring at an unfamiliar ceiling. "Ah, you're awake. Would you like some soup, or at least warm water? You nearly died from hypothermia out there, getting drenched by the rain."

Caster, after seeing that her clothes were changed into a white robe, was about to slap the man who was speaking, who caught her hand the moment she tried to do so. "Take it easy, I had one of the priestesses in the temple help you change. Your clothes are being dried after I washed them. Once you've recovered, you can leave anytime you like."

After hearing his words, she turned to observe the person who rescued her. He seemed to be about 5'7", has short black hair and wears a rather big pair of glasses. He was wearing a plain light blue T-shirt and a pair of blue sweatpants with a darker shade. While his outfit was plain, he was fairly handsome. Noticing that she was staring, the boy asked, "Is there something on my face?"

Snapping out of her thoughts, Caster fought back a blush and shook her head. "No, I was just thinking about something."

The boy put his hand behind his head and scratches his own hair. "Ah, oh good. Not to be intrusive, but what were you doing out in that weather? You don't seem to be the foolish type who gets herself sick on purpose."

Seeing the look of hesitation on her face, the boy immediately added, "You don't have to tell me anything you're not comfortable talking about. By the way, my name is Liu Yuuki, nice to meet you."

Noticing nothing but sincerity out of the boy's eyes and speech, Caster replied, "Thank you, I don't know how I can repay you. But why did you save me?"

Yuuki can't help but wince at her tone of bitterness and sadness and said, "Well I'm not exactly the nicest guy in the world, but I generally don't like to leave people to rot. Why do you sound like you didn't want to be saved?"

Surprised at how perceptive the boy was, Caster answered rather evasively. "It's a long story, but I was fighting off somebody, trying to escape before I passed out."

Still noticing her careful choice of words, Yuuki said, "And why pray tell, would a Servant be running from her own Master?"

At hearing those words, Caster tried to put up a fighting stance of hostility, but immediately fell back down onto the bed she was lying on. Yuuki looked at her with a sad smile, "Relax, I'm not an enemy. By your appearance, I'm guessing that the war's happening again?"

Still refusing to let her guard down, Caster looked at Yuuki with an accusing look. "Who are you? Why do you know about Servants and Masters?"

Scratching the back of his head again and smiling sheepishly, Yuuki replied, "Well, that's a long story too. But the short version is that I was a victim of the last Holy Grail War."

With a look of understanding, Caster nodded, "I see. So you know more than you let on then. Now what do you plan to do with me?"

Yuuki couldn't help but laugh at her seriousness, "Calm down. I told you, I'm not going to hurt you or anything. The truth is, since such a conflict is happening again, I was hoping to stop it. And seeing as you're here, I was hoping that you could help me do so." Finishing that sentence, Yuuki held his hand up and showed her his command seals.

Caster couldn't help but laugh bitterly. "What makes you think I'll help you, considering that you know who I am?"

Yuuki gave her that sad smile again. "It's because I know who you are that I'm asking you for help Madea-san."

Caster had a look absolute shock for a moment before asking Yuuki, "Wha-how? I knew you could figure out which class I was at first glance, but how did you figure out my true identity?"

Yuuki looked at her with a seriously face. "Let's just say for now, that I have been studying up. I know the reason that you were summoned and why you are the class that you are. My past wasn't exactly all buds and roses either. I'd like to help you finding that happiness that you were missing in your first life, if you'd let me." Having said that, he held out his hand in front of her.

Caster, surprised at how this boy is far more perceptive than he let on, took his hand and answered, "If you can do as you said, I'll gladly accept your offer, Master."

Yuuki did his trademark scratch again and said, "Meh, don't call me that. I learned from my dad how Masters and Servants referred to each other in those terms, but I hate that. I consider us to be partners, call me Yuuki Madea-san."

Caster couldn't help but smile at the kind words of the boy, "If that is your wish, Yuuki-kun."

Yuuki couldn't help but smile back. "Glad to hear it Madea-san. Now, I know who our competition in this war are, but we can't exactly charge in like idiots. So here's the plan…"

Fuyuki High School, Right After Shiro was Revived and Left for Home

Caster and Yuuki showed up in the hallway, only to notice the dry blood on the floor. Yuuki couldn't help but curse, "Shit! We were too late, he's already on his way home. Come on, we've got to hurry if we want to help him. Let's go Caster-chan."

Caster couldn't help but blush at his choice in suffix, "Yes Yuuki-kun. Let's." Using her magic, she began to levitate them towards the Emiya estate.

Emiya Estate, Right After Saber's Appearance

Lancer was about to lend a seriously blow on Saber with Gae Bolg when an energy shot nearly hit him. Lancer had no choice but to jump back. Noticing the appearance of two other pairs of Masters and Servants, he said, "Meh meh, looks like I have no choice but to retreat. It can't be helped, but my Master's the cowardly type. Plus it looks like those four are going to get in my way too. I'll kill you yet, Saber."

Yuuki, noticing who the male Servant was, asked, "Lancer wait! Why are you working for a corrupt man like Kotomine?" Lancer had a look of surprise on his face before he escaped, as does Rin, who just appeared with Archer the same time that Yuuki and Caster did.

Saber, Archer and Rin looked ready to attack this newcomer. Shiro asked with a look of confusion, "Yuuki? Tosaka? What's going on here?"

Rin looked at Shiro for a second before turning back at Yuuki, "All right, who the heck are you? And how do you know Kotomine?"

Caster looked ready to attack also but Yuuki put his hand on her shoulder, wordlessly telling her to stand down. Yuuki smiled sheepishly with his trademark scratch, "Meh, it hasn't been that long, has it Saber-chan, Rin-chan?"

Rin and Saber couldn't help but blush at the suffix and thought, 'The only person who ever called me that was-' "Yuuki-kun?"

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