I saw some errors in the story, so I updated it as of 10-06-12. Hope I got them all.

A/N: READ THIS, IT'S IMPORTANT! Yo, The Sin of Justice here, or just TSOJ for short. As you may have guessed, this is my first story so…YOU WERE WARNED! But anyway, I believe this is an at least somewhat original idea for a plot used for a Naruto/FMA crossover, though I may at some point just cancel the story for one reason or another. If I do, then you are all free to adopt this as a challenge, it may end up that way, you guys will likely be better than me. Also, I will probably not do pairings, but if I did then it would be a NaruHina.

Now for some story details. Some characters might be OOC, so I will either need some time to get the characters' right or they are intended to be that way. Naruto is intelligent… like a once in a lifetime genius, but he will not be so smart to the point where he can do anything, I hate stories where he is too smart. He's going to be about as smart as Edward Elric, in fact he may be very much like him. (You'll find out soon!) His parents are alive, and he has a sister, Namikaze Natsuki. Namikaze Naruto was born with an incredibly serious and extremely rare disease that I just decided to call Chakratitis; it basically causes a person's chakra to diminish over time, also leaving them in a constant critical condition, to the point where they will eventually die. It destroys any chance for anyone to become a shinobi; most do not even live past ten years old. And about Edward? You'll find out soon XD! If I end up giving up on the story then I'll tell whoever is going to adopt it about the plot. Though, how he gets to the Elemental Nations is totally unique, as far as I know anyway.

Please review, all reviews are wanted, I need to know if I'm doing anything wrong people! Criticize me please if you see fit, just no flaming! This is my first story on Fanfiction after all. Well, I think that I've talked long enough, On to the story!

Disclaimer: I do not own Naruto, Naruto Shippuden, and Fullmetal Alchemist: Brotherhood or anything related, except this of course.

Normal speaking: "What"

Normal thinking: 'Have'

Bijuu/Truth/Jutsu/Summons voices speaking: "I"

Bijuu/Truth/Jutsu/Summons voices speaking: 'Done?!'

The Everlasting Sins

Chapter 1: The Sin of Neglect

It started out like it was going to be a perfect day. His wife was giving birth to twins today, a boy and a girl, but they knew that they should take precautions just in case something unexpected were to happen, and they were right to do so. It was too bad that said precautions did nothing to stop the Masked Man, (1) who had killed all of their shinobi guards, went through the barriers, and took their newly born children, Namikaze Naruto and Namikaze Natsuki.

'Damn it!' Namikaze Minato thought when he could not get to his wife or his children, since the Masked Man had both of his kids in his arms, threatening to kill the both of them if he tried to prevent him from his goal. The Yondaime feared that his objective would be releasing the ninth and strongest of the nine Bijuu, the Kyuubi.

'Come on there has to be something I can do?!' unfortunately he was too late. The Masked Man had already done what he had come to do, which as he feared, was to extract the Kyuubi from his wife, Uzumaki Kushina, which had nearly killed her, upon Konoha. Now with an even greater danger at hand, he had summoned the toad boss, Gamabunta. Minato was hard pressed to think up a plan of action. After all, he had both the mysterious Masked Man and the Kyuubi under his control to take care of, and the demon fox was killing shinobi left and right like child's play. Having come up with a plan while fighting and saving as many people he could, he decided to use a tremendously difficult and newly created Fuuinjutsu. Having chased away the Masked Man, who had lost control over the Kyuubi when Minato used the Contract Seal on him, he turned his attention to the said demon, it's own attention momentarily on the Konoha shinobi scattered all around it and off Kushina and his twin children.

"Gamabunta! We have to get over to Kushina! I have to stop the Kyuubi, hurry!" shouted Minato over all the chaos,

"Alright, I'm on it!" was the giant toad's response. And true to his words, they had arrived moments later; however, they ended up catching the kitsune's attention. Minato, now off of Gamabunta who was busy distracting the giant fox, was currently kneeling over his fallen and heavy breathing wife, who was desperately holding on to Naruto and Natsuki.

"Kushina, I need to put a stop to the Kyuubi's rampage, please give me-!" Minato was cut off though by the female Uzumaki.

"No! I won't let you seal that monster into either of them! Seal it into me instead! I know I will not survive, but I'll take the Kyuubi with me!" yelled Minato's wife, tears trailing down her round face.

"Kushina, I can't let Naruto or Natsuki live without their mother, and I can't either. I promise that I'll survive, we all will. I'm not going to use that Fūinjutsu; I'm using Fūinjutsu: Idaina Chakra To Tamashī Bunri." The Yondaime Hokage said calmly, trying to both calm and convince the red head to perform the much less dangerous, but still risky jutsu.

She seemed to be thinking it over as she fell quiet, then she conceded, her reluctance clear as day as she gave him their two newborn babies with a heartbreaking look on her face. "Don't you dare die you bastard, or I'm going to kill you for leaving me." She said as Minato left to perform the seal.

"I promise I will not Kushina!" was all he said as he left. However, he didn't have to, because the Kyuubi, having figured out their intention, lunged at them, but it was already too late for it to halt the performance of the jutsu. "Fūinjutsu: Idaina Chakra To Tamashī Bunri!" The Yellow Flash yelled at the top of his lungs.

And thus the nine-tailed demon fox's chakra was split from it's soul, the former being sealed into Namikaze Natsuki while the latter was sealed into Namikaze Naruto.

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7 Years Later

It was an ordinary day for everyone in Konoha, the citizens were out in the village chattering happily with one another, the shinobi were busy with various missions and keeping guard of the village, and the Namikaze family was celebrating, with many of their friends, the 7th birthday of Namikaze Natsuki, while leaving Namikaze Naruto all alone, neglected in favor of his little sister. Yep, it was just a regular day today like any other at this time of year.

'Why? Why do they do this to me? Is it just because I'm disabled, because my sister was blessed with the Kyuubi's chakra while I contain it's soul? Because they don't see me fit as a living being, a person, or a son? What reason could they possibly have for leaving me all alone?' asked Naruto in his own mind as he looked out his bedroom window. This thought was a normal recurrence as well. It all had to do with exactly 7 years earlier.

After the Kyuubi was split and sealed into the Fourth Hokage's newborn twins, he and the council had discussed what to do with them. Later, after hearing Minato's explanation of the sealing, many of the shinobi and the civilians screamed for the "demon brat" to be executed for merely containing the monster's soul, but he wasn't going to let them do that because the "demon brat", as they had called Naruto, was his son. However, they didn't say such things about his daughter Natsuki, who held within her small body the beast's powerful and deadly chakra. In fact, they rather loved her for saving them from the Kyuubi, but they only saw Naruto, who held the very demon itself back within own his body, as the Bijuu even though he was just as responsible for their safety. Such is the ignorance and blinding hatred of humanity.

However, later at the hospital, they had found a very rare, ruinous, thankfully not contagious, and incurable disease (Incurable to their knowledge anyway *wink wink*) affecting baby Naruto; Chakratitis. Kushina had cried profusely upon this revelation of his, at that time, know known critical condition and Minato had a solemn facial expression with tears threatening to break loose. This disease would not only destroy any chance of Naruto becoming a shinobi, but it would also make the outside world life risking for him. He would barely ever see the light of day, doomed to be weak all of his life which was estimated to be ten years at most, though many of those that were known to be infected with Chakratitis don't even live that long. And as if that was not enough he also had all of Konoha's hatred centered right at him for something he couldn't control, sans his family and a select few.

As the years went by, the people of Konoha actually began to forget about him because he would stay within the Namikaze household due to his infection, but some still knew of him even though he only went outside, at most, once every month and even that was for just a few hours. Even his own father and mother had begun forgetting him over him over the years in favor of Natsuki. Whenever they would take a vacation, they'd leave someone to care for him, though that person, no matter who it was, usually just ignored him as well. When His sister became four years old they began her training, normally this would be too early, but with the Kyuubi's chakra and any possible enemies after her they deemed it necessary. It also helped that she was a genius in the shinobi ways. This only led to Naruto being pushed further into the shadows of everyone's mind. Basically, everyone loved Natsuki, but about 99% of Konoha either hated or ignored Naruto, which lead him to become hateful of Konoha and also his own family for neglecting him and feeling envious of his younger sister for having everything he wanted. That being to become a shinobi, having the adoration of the people of Konoha, his father and mother's attention, good health, and finally, an actual birthday party, not just a gift, usually a random book or some clothing, and a "here you go" or a "happy birthday" followed by said gift giver, which were few, going to attend his sister's party.

"Forgetting about me already are you?" said Kyuubi no Kurama from within him. Yes, this was also normal, for the young Namikaze boy anyway. No one else knew that the Kurama could speak to him or else there may be some rather… unwanted consequences. Besides, he liked having someone to speak to, even if it was the most powerful of the nine Bijuu. But he was quite terrified and troubled when Kurama suddenly spoke to him one day three years ago while reading one of the hundreds of books of various genres, ranging from fantasy, factual, informative, legends, atlases, and everything in between, in his collection.

However, over time he came less wary and gladder for finally having a companion in his very lonesome life. The reasons for this were because that, while he was the giant demon fox had nearly destroyed Konoha, Kurama was also almost just as lonely as he was, even though the fox wouldn't admit that he had sympathized with him. He also claimed that he was particularly angry, to put it nicely, for being controlled and used as a weapon by Uchiha Madara, then sealed, sealed once more into his mother, next he is released just to be controlled once more, attacked by the Konoha shinobi, and to end it all, his chakra was stolen from him and he was sealed inside Naruto. Naruto thought about this and concluded that he would be pretty pissed off too if that happened to him. It was the sympathy though that allowed them to become companions, but being as prideful and stubborn as he was, Kurama wouldn't admit such a thing, his exact words were "Why would I be friends a damn filthy, little, hairless, weakling of a monkey that can barely even walk five minutes without getting tired?" Though he did admit that he was trustworthy enough to know his name, which he said only ten others have ever known. Naruto felt some pride rise within himself because of this fact.

The reason for such a shocking number of books was simple, he had no other activity to occupy his substantial amount of time, and thus it was his favorite and only pastime. This has caused him to become a genius, not shinobi wise like Natsuki, but in actual intelligence. He was in fact about as smart as his father the Yellow Flash if not more so, though no one knew this since they paid barely any attention to him. This included on his birthday, while his sister was practically showered with gifts from his parents, the old pervert Jiraiya, the seeming young drunkard Lady Tsunade, the lazy and often late Hatake Kakashi, the former Hokage Hiruzen Sarutobi, and various clan heads and their families, while all he got were some random books that some of them bought whilst getting Natsuki's presents, some of which were for four-year old kids. Needless to say, he was insulted by this.

He was able to get as many books as he has now because he would ask his father or mother to get some for him while they were out. They never questioned why he wanted so many; they probably thought that he was just trying to occupy his abundant amount of time. Though when he asked for certain books, like ones involving Ninjutsu, Genjutsu, Taijutsu, Kenjutsu, Fūinjutsu, how to control your chakra, and various others that only one that wished or could actually become a shinobi, they did question him, but all he had ever said was "I just want something different to read. Besides, when am I ever going to put it to use anyway?" When they heard this they felt some guilt within themselves for Naruto's life due to his disease, so they conceded and bought them for him.

He, of course, absorbed all the knowledge that the books could give to him like a sponge. The problem was actually putting that knowledge to use, which despite his grave state, he was going to solve pretty soon, all with Kurama's aid.

"Of course I haven't Kurama, how could I when you are my only friend?" Naruto spoke. To anyone else it would appear that he was talking to himself, but in reality he was speaking with Kyuubi no Kurama.

"I'm not your friend, Kit. I merely sympathize with you and speak to you, nothing else. Why would I be friends with a human?" was the ninth Bijuu's response. "… Are you certain about leaving tonight?"

Naruto waited a few moments, still staring out his window in his rather secluded and not often visited room at his family and all the others celebrating Natsuki's birthday, watching her soak up all the attention, whilst he gets absolutely none.

He then said "Yes, I am. We have everything we need right? Let's see, we have plenty of food and water, camping supplies, a first-aid kit, my medicine, some kunai and shuriken, all the necessary books, and my map. All sealed in my scrolls. I really have to thank you Kurama for helping me with this all these years. Without you, I'd never be able to even use seals nor would I be able to actually leave this place."

Over the years that he had been alive, Kurama had been slowly absorbing chakra from outside the seal, gradually channeling the acquired chakra into his Keirakukei. This allowed him to be just a little healthier than he was, adding a couple years to his short life span making it 12 years, and allowing him to use seals which do not take too much chakra. Not to mention that it was also going to allow them to leave the village to reach their rather far away destination.

"You're welcome, Kit. I'm glad that someone can appreciate my greatness" Kurama spoke, stroking his own ego, as normal. "I think that's all it, you did pack in that book, right?"

"What greatness? You have barely any chakra; you're just a bunch of bark with no bite." The nine-tails growled at the insult, but said nothing. "But anyway, yep, got it packed, can't forget that after all, how else am I going to find my way? Even if we get there we won't be able to find our target without it." The book he was referring to was Stand On Your Own Two Legs, a common chapter book about an apparently centuries old tale of a lone teenager and his brother going against all the odds to succeed in his endeavor to regain their original bodies. (2) It was supposedly a fictional tale that was related to a legend from long ago, so Naruto was a bit confused regarding why Kurama wanted him to buy it when he walked into the Konoha Library while he was taking one of his rare monthly walks two and a half years ago, wearing a large brown coat to hide who he really was from the civilians of Konoha at the time.

Naruto's constant companion told him to "look underneath the underneath", meaning that there was another meaning to this story. Using his very high intellect, he was able to pick up on a code, a very difficult one that he would not have noticed if Kurama had not told him to look for it. It took him a long while, about a year, but he was able to finish decoding the book's story, and he was shocked to say the least. He had found that this book was actually a map to leading all the way to a certain destination. And at this destination was a reclusive old man in hiding that Kurama had said would not only be able to cure him of his Chakratitis, but may also be willing to teach him a long forgotten art, but only if he was deemed worthy by the man, of whom the nine-tailed fox assured, he would deem so.

When Naruto inquired how he knew all of this information, the Kyuubi only said that the man was someone that was more than met the eye, that he truly considered a good friend, and that he knew a bit about how the man acted and thought. He also silently mentioned that he was one of the few people he would ever be afraid of. At this Naruto laughed whilst Kurama wondered what possessed him to say that, feeling embarrassed and his pride hurt, though he tried to cover this up by shouting at him to "Shut the hell up!"

"Alright then, let's get this show on the road!" said Kurama from behind the seal. Naruto smirked, wanting to get to their destination right away he picked up his bag full of scrolls which held all the necessities and went to his door, but before he left his room he looked back at his desk, lying on it was a letter addressed to his family, informing them of his leaving and why, but not the destination or any clue of it. Then he went out the door, sneaked away from the house, went through the village and avoided the villagers by wearing his inconspicuous brown coat, sneaked past the guards at the entrance of Konoha, and finally entered the forest, heading east.

"Onward, to Uzushiogakure!" were Naruto's last words in Konoha. "I won't be alone anymore once I get there and find that man."

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(1) You should all know who this is, if not then look him up.

(2) Again, you should all get this reference, because you should know it if you are reading this story, or else learn it.

BTW, please answer my poll, it's important for later chapters because I have a quirk were I need full details to get to work. It's simple, just pick a name.

Two more things, I need a Beta Reader for my story, so if you know a good one for this story, then much appreciated! And I might need a better Japanese translator, it's probably not important, but it would be nice to know.

Well that's all for this chapter folks. So anyway please tell me how I did through a review, and please use only constructive criticism! No flaming please. The more reviews the more I am motivated to write my story. Reviews = more confidence = hard work = faster updates.

TSOJ, out!