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So it's been a couple of years since Naruto ended, and I don't think the
author answered this question/mystery within the Narutoverse: Isn't a Bijuu
supposed to die after the host's death? How exactly did Minato have 50% left
within him, and why did this chakra not return to Naruto?

If this was answered in some interview or solved, could you direct me to them?
This could be counted as plotholes or something that was left to reader's
discretion by Kishimoto-sensei.


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question
naruto
What happened to Kurama?


During the Nine-Tails attack, Minato divided Kurama's chakra into two parts.
Reason is that Kurama has a huge amount of chakra that **couldn't be sealed
inside baby Naruto**.

So Minato used the Reaper Death Seal to seal one half of the chakra inside him
as there was nowhere else to seal Kurama, and not sealing the other half will
create further problems (like more destruction to the village).

Now in case of Reaper Death Seal, the soul is trapped inside the belly of the
death god, so nothing can escape it. When Orochimaru released the trapped
souls, everyone came out. I think this is why Kabuto never reanimated any of
the hokages. And as Kurama was trapped inside Minato, so that chakra never
escaped.


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When Minato used the Reaper Death (Dead Demon Consuming) Seal he essentially
split Kurama into two parts:

  1. Yang Kurama
  2. Yin Kurama

Each half [Kurama](http://naruto.wikia.com/wiki/Nine-Tails) have their own
conscience, making them two separate entities.

> Later, when Naruto and Minato bumped fists, Yin and Yang-Kurama came in
> contact with each other, with Yang-Kurama greeting its other half casually
> and asking it to share its chakra, which led Yin-Kurama to note that asking
> itself for chakra was an odd situation

The reason for separating the charka was because an infant would not be able
to withstand the power of Kurama if he had contained both sides of his chakra.

> Since Kurama's chakra was too immense to be sealed within an infant like
> Naruto, Minato first used the Dead Demon Consuming Seal to separate and seal
> its Yin half within himself and then prepared the Eight Trigrams Seal to
> imprison the Yang half within Naruto

Furthermore, Minato, knowing the consequence of performing the [Reaper Death
(Dead Demon Consuming)
Seal](http://naruto.wikia.com/wiki/Dead_Demon_Consuming_Seal), seals Yin
Kurama within himself.

> When Minato uses it, he seals only the Nine-Tails' yin chakra, leaving its
> yang chakra alone; this sealing of its yin chakra into himself makes him its
> jinchūriki.

The consequence? Death.... kind of.

> For a few moments afterwards the summoner can continue moving and speaking,
> allowing them to finish any lingering business they may have. Shortly
> afterwards the Shinigami will consume their soul and the soul of their
> target(s), ending their life. The souls of those trapped within the
> Shinigami's stomach cannot enter the Pure Land and are destined to fight
> with their victims for all eternity

With Kurama being split into two separate entities, one half was trapped
within Minato while the other half lived on and was sealed within Naruto.
Because the souls are trapped within the Shinigami's stomach, destined to
fight each other, this also explains why Minato is able to use [Nine Tails
Chakra Mode](http://naruto.wikia.com/wiki/Nine-Tails_Chakra_Mode).


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answer


The other answers are good, but they don't really point out the main reason
why Yin Kurama did not reincarnate.

The [Reaper Death Seal, or Dead Demon Consuming
Seal](http://naruto.wikia.com/wiki/Dead_Demon_Consuming_Seal) is a special
kind of seal. It not only kills you, but your soul is sealed inside the
Reapers Stomach. By doing so, you are cut off from the Pure land.

From the entry on [Bijuu](http://naruto.wikia.com/wiki/Tailed_Beast)

> Because the tailed beasts are pure chakra, they cannot actually be killed;
> if they or their jinchūriki die, their chakra will re-coalesce in time. In
> addition, if a large portion of a tailed beast's chakra is separated from
> it, that chakra becomes a separate, sentient copy of the tailed beast.

This is the 2 bits of most important information here. First, Kurama was split
in half, and the Yin half was sealed in Minato. This half was then taken into
the Reapers Stomach, where it was sealed.

Now, as noted, they can not die. So why didn't the Yin half revive? Simple,
Because they don't actually revive. As noted in the quote, their Chakra once
dispersed due to death of some kind, will coalesce, giving them form again.
However, the half sealed in Minato's soul was taken into the Reapers Stomach,
and there it was sealed. There is no way for it to escape, and so it cant
merge back with Yang Kurama, nor can it coalesce into its own half. Bijuu can
not easily escape from their Jinchuriki, and the Reaper Death seal is like an
incredibly powerful version of that.

so Tl;DR, Bijuu don't die, ever. They just disperse and coalesce. However, Yin
Kurama was sealed into the Reapers Stomach, and not only could not escape, but
didn't even disperse in the first place.


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