Disclaimer: I do not own naruto or fate/stay night.

Talking – speaking normally

Thought – Thinking

Demonic/Unnatural etc. – Tone

Chanting – Servant Summoning

DX7 here, this will be a story I will be doing when I want to write it. I am a very fickle person, thus this story and the Shinju: First World story will be written interchanging. I myself also do not know if and when I do things. Like my first story when Naruto meet Setsuna, I was watching tv and BLAM; the idea of making Setsuna a kid came to me and then I change the plot. So… what I want to say is that my story WILL change a hundred thousand times as it progress, even I DO NOT know what I will write for the next chapter. Sorry for my long speech but I just want to clarify something… therefore, the story begins.

Prologue: The Madness of Boredom

Here we see our favorite protagonist; one Uzumaki Namikaze Naruto the Ancient one, the King of ævi, The Observer and many many other grand titles. He still can't understand why he was given the title 'The Observer' when he often does more than just observe. But here he is in his self made main dimension; the one where his people call home unlike those secondary ones that he created to store things, bored out of his mind.

Over the thousands of years, he travelled to various dimension and reality doing various things; learning, collecting and doing things to alleviate his boredom. It not that he finish seeing all the different reality as there are countless of them; billion of new reality are 'born' every second after all. But it is that he does not know which ones to go since some of the realities are peaceful and thus boring. There are new things to see, do and experience but he is just so very bored.

If you ask the residents of a certain section of reality, they would say that he is Zelretch level bored which to them is liken to the end of the world. Speaking of his old friend Kischur Zelretch Schweinorg also known as Kaleiscope, Zelretch the Wizard Marshall and a whole bunch of title, Naruto wonder if his friend is as bored as he is now.

Originally they both were not friends as when they first met is when Zelretch found his dimension and curious that this single dimension does not branch out like other dimension do since it isn't a original dimension but one make by Naruto, he decide to visit the dimension to see why is the dimension different. After a few try to enter the dimension, Zelretch is finally able to do so as he comes face to face with Naruto's sword in his face.

Naruto was resting that day when he felt someone trying to enter his dimension, but knowing that the dimension is quite hard to enter if one do not have his permission, he did not think much about the person trying to break in thinking that he or she will just go away when he or she realize that they can't enter the dimension. To his surprise, the person did not go away but successfully entered his dimension. Taking one of his sword, Naruto attack the intruder on sight hoping to capture him and find out how he enter his dimension so that he can repair that hole in the barrier surrounding the dimension.

To his second surprise of the day, the person who look to be a elderly male manage to block his sword without visible strain. After exchanging a few blow; nothing serious, the confusion between the two is cleared.

Naruto explain to the elderly who he found out to be Zelretch about this dimension, who he was and various information of the people in the dimension. Safe to say that Zelretch is impressed by the various species of people inhabiting the same place peacefully. After all, different race has different ideas which cause misunderstanding that often result in war most of the time.

And in turn Zelretch explain to him who he was, his magic and his world. The two of them struck a friendship as it is rare for there to be a multiply dimension traveler and the trolling and pranking habit the two of them share. Needless to say the two of them exchange notes on their skill sending many a shiver down the backs of everyone in the multiverse.

The two of them then travel together throughout the multiverse competing with each other using their skill, claiming for the title of the trolling/pranking king. Inhabitants of several dimensions went mad and subsequently destroyed their dimension, thus ending their lives to escape the horror that is the 'war' between Zelretch and Naruto.

Naruto also learn to use Zelretch world's particular kind of magic as there are different kind throughout the multiverse. Naruto originally wanted to teach Zelretch how to use chakra in return but found out that he is a undead and thus not able to use chakra, Naruto gave up on the idea but he did teach him about the theory behind using it.

Back to Naruto who is chanting "bored, boredom, boring…" and various other words that means the something when a flash of light appear and out of the light came Zelretch who look to be equally bored. Stopping his chanting when he saw Zelretch, he ask "Yo Zel, what are you doing here?"

"I bored, so I come to see what you are doing to alleviate my boredom since most of the time you are in another dimension messing with people and stuff. But when I reach here, I found that you are doing nothing and bored out your mind" said Zelretch looking at Naruto.

"Huh, I was going to see if you have something fun but it looks like you are bored the fuck out of your mind too." Naruto said becoming more bored as each second passes. Suddenly, Naruto have epiphany as he realizes that he have not visited Zelretch's world and crackle in delight.

Zelretch seeing his old friend suddenly laughing, he silently wonders if he becomes mad due to the boredom.

Facing Zelretch, Naruto voice out his idea "Zel, have I ever gone to your world?"

"No, never." Zelretch answer not seeing where this is going.

Seeing that Zelretch has not caught up, Naruto elaborate his plan for his sake "Remember what you tell me of the Holy Grail Wars?" Zelretch nod, giving Naruto the cue to go on. "Now, what if I go in to participate as the 8th Master of the 5th Grail War?"

Seeing where this is going, Zelretch too crackle madly at the entertainment that such an act will provide. Agreeing to the idea, he quickly gathers his magic to transport both of them to his world but not before asking Naruto why has he chosen the 5th Holy Grail War to fight in instead of the 4th Grail War.

"Ah Zel, that is the fun in things. You did not tell me anything about 5th Grail War so I will be fighting without knowing anything while I already know about the 4th Grail War; the masters, the servant and what they will do. With me included and the knowledge of their plans, it will be too overkill. Beside, now that the Holy Grail is corrupted and Archer from the 4th Grail War might be alive, things will be more interesting in the 5th Grail War than the 4th, don't you think so?"

Amuse that Naruto caught onto him when he did not mention that the 4th Grail War Archer, Gilgamesh is dead. He did tell him of the battle between Archer and Saber. And he also did not mention the identity of the heroes as well as Naruto is not interested in the identity of the Servant but of the Masters participating, especially their reasons and the Holy Grail War system.

"The system is for the war is flawed as well, so you might be able to see a more interesting sight as well." Naruto said as he continues to tease Zelretch of the possibility of even more amusing sight if he sent Naruto to the 5th Grail War.

Unable to contain his excitement of a good show, he opens up a portal one month before the 5th Grail War for Naruto to set up shop first. As Naruto walks towards the portal, Zelretch ask him of what he will do. Naruto continue walking towards the portal but before entering it he said "Zel, watch the show and you will find out. I don't want to spoil it for you after all."

Thinking about what his friend said, Zelretch agreed that he wouldn't want to spoil such a good show after all and proceed to cross dimension back to his room in the clock tower to prepare popcorn for the show…

Naruto's POV

-Outskirt of Fuyuki City-

Reaching my destination, I look around and found myself in the outskirt of Fuyuki City and that there is not a single person or building within 5 mile of location, I then proceed to 'tied' myself to the Grail to participate in it as the 8th Master. Seeing the 3 command seals in the form of the Uzumaki Clan symbol, I know that the first step is completed.

Looking around the forest, I found a clearing to draw the Magic Circle needed to summon a Servant using my own blood as the catalyst. Through this Summoning Circle is different from the generic ones as it does not help to summon a specific Heroic Spirit but that it contains time and space runes in it. Naruto then set up a space/time barrier using seals from his world.

Checking the Summoning Circle and the space/time barrier to ensure that there isn't any flaw in them, Naruto start to chant the spell to summon his servants:

Creation and destruction to the origin. Life and death of contract is the cornerstone. Time will obey. Space will bend. I am the origin of all life.

The alighted wind becomes a wall. The gates in the four directions close, coming for death, and the three-forked road that leads to life circulate.

Shut (fill). Shut (fill). Shut (fill). Shut (fill). Shut (fill).

Repeat for eternity without end.

Simply, end once filled.

- I announce.

Your self is under me, my fate (doom) is mine alone.

In accordance with the approach of the Holy Grail, if you abide by this feeling, this reason, then answer.

Here is my oath. I am the one who create all in the world of the dead. I am the one whose sin is heavier than all of the dead. I am the one who destroy all in the world of the dead.

You, bound to my words of power, clad in the Great Trinity, come forth from the heavens, O keeper of the balance-!

Then the magic circle glow with an intensity that fill the night sky with its brightness; golden light dance across the sky with various colors accompanying it, encompassing all with its gentle glow. The lights die down and reveal…

A/N: So… how is the prologue. I am sorry to say that this story will be a mass harem and the number of servant that Naruto will have and who they are is determined. I might write a lemon or two in the future, I am not really sure. Also, starting from chapter 1 onwards, there will be a question omake. I will answer question that does not contain spoilers and only 2 questions per person to one character per question. Please review.