Prologue
This is AU. Some of the detail will follow Boruto, some will not. The details of the otsutsuki will also be modified, along with their history. If you want a fanfic as close as to Boruto lore as possible, then you should leave.
Chapter 01: The Old Man
It had been.... Quite the centuries, looking down below the afterlife.
At his legacy.
Hagoromo sighed. The world was still as chaotic as it used to be, If not even more so.
Only now, they added chakra into the mix. Chakra is a power he bestowed upon humanity to connect themselves with each other, to understand pain and experience happiness together. Humanity turned it nto a weapon of mass destruction. What was to empower each other, become tools for complete annihilation.
Not even Senjutsu (sage art), an art he and the three venerable sages created to appreciate the natural wonder, was safe from corruption.
The old great wars were over, at least for now. But in place of open wars, Humanity engaged in clandestine one.
Spying, double agent, brainwash, kidnapping, assassination.
And finally, one of his direct descendant from Indra’s line, corrupt everything that he and his spiritual brother built and sought to recreate a nightmare that the God of Shinobi and his brother stopped.
To make matters worse, he was able to steal their prisoner from his brother’s home. A proof that he was not only able to replicate his power, but gets closer to the power his mother wielded. All of this, despite the measures he had taken, destroying everything his mother built and erasing any record of her time as ruler of the land.
All that’s left for Hagoromo was a hope. That whoever Gamamaru prophecized would unite his sons and become the savior of the world to arrive soon.
Else this self proclaimed one will recreate a great nightmare like his mother.
Suddenly he felt a tug. A small one. From the world of the living itself. It’s been a while since…. Forever? TIme was fluid in this realm between above and below. The pull was a familiar one to Hagoromo himself, so the the sage didn’t mind. Every once in a while His sons chakra reach out to him, trying to assimilate him into their being. They never succeeded. One of his direct descendant came close, but he ended up re-creating his chakra from scratch and cultivated it for years to awaken his eyes.
Sometimes, Hagoromo was tempted to follow such temptation. To reunite with his sons. He missed them, in fact, and wish for them to cease this insanity and return to the spirit world whole. He tried using the exact same tug to pull them instead, alas whatever ninshu they use was strong enough to deny his power. His unruly sons refused to end this age-old squabble they had, and their conflict shaped the world of living into what it was before him
But this one was different. The tug wasn’t the usual harsh one from Indra, nor it was the slow pull from Ashura. No. This one was mechanical, and didn’t possess Indra or Ashura’s chakra signature. Hagoromo realized why it was familiar, it used the mechanism of Ninshu that Indra and Ashura used. Hagoromo push away the pull, not even he wanted to shoulder the insane burden his foolish sons unknowingly placed on their fate.
Destiny, however, had another things to say.
The instant he repelled the call, multitude of chains ensnared his body, dragging him down to the world below.
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Damn this hokage. Damn this Uzumaki. Damn them all to hell.
The nine tailed beast roared helplessly, as the ethereal hand of death itself pull him into its stomach.
A power that even his father can’t deny. The Uzumaki were always playing with the divine and this sealing technique take the cake. But it wasn’t the uzumaki girl who done this. No. The seals designed to imprison him within her prevented her to do so.
It’s the yellow bastard. How dare he. This... this insignificant boy. Never he realized that the boy will be the one to cause him so much trouble. Not even when he rescued his redheaded jailer. Not once. Had he known that this Hokage will be the one to mutilate his being, he would’ve done his best to kill him.
The massive beast roared as he felt his soul split in two, his being separated down to its most fundamental level. No human had ever done something so vicious to him, not even the red eyed descendant of his brother.
It’s not too late, he thought. While the husband and wife bicker and the chains got loose, he rise up his hand and brandish his claw to kill the child. He will not be jailed in another Uzumaki. More importantly, he wouldn’t be jailed in the kin of this vile yellow-haired bastard.
[Clang]
The sounds of the Uzumaki famed sealing chains being ripped apart alerted the man and wife as Kyuubi’s chakra flared once more due to the seal weakening. With deceptively fast speed, Kurama swing down his claws to kill the child.
Then, the unthinkable happened.
It was possible for one to withstood his power. After all, He, the greatest of the tailed beast, still possess limited power that allows room for defeat.
Madara. Hashirama. Their techniques and kekkei genkai not only able to match his strength, but also subjugate him.
Mito Uzumaki, her prowess over fuinjutsu and Uzumaki’s chains kept his power at bay.
His latest Jinchuuriki also possessed the same strength as Mito Uzumaki. Her husband also possessed the skill over seals to lock him away from the world.
But never he imagined these. That two humans, Two dying humans, withstood his power with nothing more than their body and willpower. He was so stunned by the mere possibility of it, that it allow Kushina to mould more chakra and create stronger seals around his body.
“What? NO! NO!” it tried to cry out his rage, but that former jinchuuriki of it hold him tight by the neck, preventing him from interrupting their last moment
"Why? Why did you do this? I'm his father, I should... I should have been the one sacrificing myself to save my son; my life is already forfeited anyway."
"I'm his mother, I have as much a right as you do!".
The chakra beast let out a roar, an impotent one since he can’t break through the chains nor stop the two from giving their parting words to their pathetic spawn. How he wished he can push further, tearing the soft skin of that baby.
Damn that Hokage. Damn that Uzumaki. Damn them all to the filthiest part of hell.
‘I’m going to kill that boy. I’m going to claw on his seal and corrupt his soul with the world hatred. I’m going to rend his spirit to pieces. After that….’ the colossal mass of chakra seethed inside. His rage manifested as a violent physical energy that was strong enough to snap the chains around his neck, enough for him to gave his final threat to the young hokage.
“I will have my revenge on you Yondaime. Mark my word. I’ll tear up the belly of Death God himself and feast on your soul!”
Minato slightly turned his head and audaciously smirked at the beast. His son would not be easily defeated. The woman he loved the most gave birth to him, after all. Namikaze Minato responded by shouting his final jutsu, marking the end of his era and simultaneously gave the nine-tailed fox his final (figurative) middle finger to the beast.
"Hakke Fuin Shiki!(Eight Trigram Sealing Style)"
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The sage was wrong. He was wrong. Just like choosing to focus on Indra because he had the talent. Then choosing to give the responsibility to lead Ninshu to Ashura when he proved his worth, instead of both of them.
He was a fool. He thought the blue-eyed boy will be of Ashura’s lineage and will be Ashura’s reincarnation.
He was partly right. The boy was an Uzumaki. Ashura’s blood flows strongly in him.
But the savior of this world was not Ashura’s reincarnation.
The boy was his.