Disclaimer : I do not own Naruto's character and universe, I'll gladly give all the profit that I'll make by publishing a amateur story on a free fanfiction website to Masashi Kishimoto, the creator of Naruto. If there's mistake, feel free to point them out, English isn't my main language and I'm no Naruto's expert. This story take place after the current manga chapter, 376. Team 7 and team 8 had to cancel there mission to rescue Jiraiya and stayed in Konoha since then. Please review and enjoy my first story.
The five blade
Once unified under the reign of one powerful man, the land was again torn asunder by war and rivalry between brother, each one wanting a part of their father empire. As the fighting grew more and more violent with no end in sight, a nameless blacksmith visited the five sons who, in his eye at least, were the best fit to rule a county. To the strong Tsuchi, he gave a hammer able the cause earthquake. To the wise Mizu, he gave a katana able to cut the wave. To the Brave Ho, he gave a shuriken able to burn the very air on his trail. To the Charismatic Kaze, he gave a spear that travel faster than the wind. To the determined Rai, he gave a scimitar shining with the energy of a storm. With the help of these powerful weapon, the five elemental brother, as they soon became to be called, easily vanquish the other lord and, not wanting to further destroy what their father had build, they evenly distributed the land into five country named after the brother who inherit it. Over the course of time, the five legendary blade were lost or concealed because of the power they have and the danger they represent if they fall in the wrong hand.
Since the creation of the five great nation of the world has this legend been heard and most don't see anything more than a wild tale. Only a handful of human know that this is the truth, having seen or even wield one of the blade themselves. However, some knowledge fall trough the crack of history to be forgotten by all except ancient beings who roam the earth since the dawn of time. These secrets often resurface, sometime threatening the very fabric of the modern world. One such secret is the fact that there wasn't five lord who received a blade from the blacksmith, but seven.
The Demon heart
During the first ninja war, many experiment were done on shinobi to create perfect weapon. Those experiment were later known as Bloodlimiter or bloodline limit, as the secret of these jutsu are carried in the blood of it user and can't be taught. One such jutsu is the twin heart bloodlimiter of the Takashi family, on of Kumo village oldest clan. To create the ultimate warrior, the first Raikage put the heart of a demon in the chest of his best ninja. At first, the experiment was dubbed a failure and the ninja return to battle. However, while he was fighting his greatest rival, the first Hokage, he transformed into a demon and made short work of the hokage and his troop, earning the name Takashi Akuma. After the end of the war, Akuma founded his own clan hoping for his inner demon to die with him a peaceful death. Unfortunately, thing didn't go as planned and ever since that time there's a kid born with two heart once per generation.