Mu

Death Note, Volume 12, page 188, has these two rules in regards to "Mu": "All humans will, without exception, eventually die." Also, "After they die, the place they go is MU (Nothingness)."


 * English: After they die, the place they go is MU (Nothingness).
 * Japanese: 死んだ後にいくところ、無である.

These rules can be applied to both:

A. Humans in general

-and-

B. Humans who have used a Death Note

The general implication of Mu is that all humans, regardless of their actions during life, simply cease to exist upon dying and are equal in death.

Humans who have used a Death Note

 * Light Yagami
 * Misa Amane
 * Kyosuke Higuchi
 * Jack Neylon
 * Teru Mikami
 * Kiyomi Takada (she used a piece of Light's notebook to kill Mello)
 * L in the film only (he wrote his own name in Misa's notebook before he burned it at the end of Death Note: The Last Name, thus having only twenty-three days left to live)
 * Raye Penber (he unknowingly used a page of Light's notebook to kill the other 11 FBI members)

Humans who may have used a Death Note
Near (In the epilogue of the manga, Matsuda has a theory that Near used the Death Note to kill Mikami)

Humans who almost used a Death Note
Soichiro Yagami (he almost used Light's notebook, which Misa delivered, in an attempt to kill Mello after learning his real name with the use of the Shinigami Eyes.


 * However, Soichiro only wrote Mello's first name before getting shot in the back, therefore he never killed with the Death Note.

Speculation about Mu
In most instances, Mu is regarded as the Shinigami Realm. However, this is not canon, and until further information from Ohba or Obata is known, it has to be considered as speculation.

Mu is a Japanese and Korean word which denotes a negative: the absence of something. In Zen Buddhism, "Mu" is the answer given to an improperly phrased question that does not merit an answer.

The Japanese reads more like "after death, the place they go; it's Mu". And in Zen Buddhism, mu is an answer to a question that depends on invalid axioms.

So when the rule states "the place they go; it's Mu", it means the question relies on an invalid assumption. They don't go anywhere, because there is nowhere for them to go to. This is why it gets anglicized as "Nothingness", because all that exposition is way too much detail for a notebook rule.

We know Tsugumi Ohba, the author of Death Note, was influenced by Buddhism; this is why the series has 108 chapters. This matches up with various things Ohba says about life after death in Death Note: How to Read 13:


 * For me, one of the premises of the series is that once a person died, they could never come back to life. I really wanted to set a rule that bringing characters back to life is cheating. That's why death equals "nothingness" ... If I had to choose [a theme to express throughout the series], I'd say "Humans will all eventually die and never come back to life, so let's give it our all while we're alive".

Death equals "nothingness" だから、”無”なんです--"so, it's Mu"

The number 108 represents the 108 earthly desires in Buddhism.

"Mu"was the name given to an Atlantis-like lost continent written about by James Churchward in 1926's "The Lost Continent of Mu, Motherland of Man."