Spirit World (NR)

The Spirit World, Afterlife, or Heaven is the place that departed souls go to in the Naruto universe. It is composed of three dimensions; the World of the Living, the "In-between", and Heaven.

Overview
The World of the Living is the location of living souls. Those that are alive dwell in this realm until they die and then pass on. While it may not seem so, it is in fact a part of the spirit world as departed souls can live here as well. The second realm of the spirit world is a place called the In-between. The in-between realm is the place where departed spirits go if they have not yet let go of the world of the living. Upon first arriving here, the spirit will only see blackness, as shown when arrived here after having died his battle with. With enough willingness, a spirit can return to the world of the living, but are invisible to most humans and animals because they are still stuck "in-between". Only those who have died and have been brought back to life by natural means, such as being shocked back to life after flat-lining, can see and interact with the spirits in this realm. Those who are revived due to a jutsu or by other means are still unable to see the spirits here, explaining why none of the ninja killed by Pain were able to see spirits. Spirits can stay in this realm indefinitely, as shown by, who had remained in-between for years after his own death. The final stage of the spirit world is heaven. After spirits let go of their attachments to the world of the living, they pass on to heaven where they are united with their long deceased loved ones. These spirits can also return to the world of the living, but are incapable of being seen by anyone, even people who can see spirits stuck in between. These spirits, just like the ones stuck in between, can influence the world of the living, by providing comfort to their still-living loved ones. They also can morph into shapes such as clouds, or take the form of a bright light which can be used to guide the living. Spirits in this realm also seem to have infinite knowledge and wisdom, unlike those stuck in between, who are still clinging to their humanity. Spirits in this realm are unable to be returned to life, even by means of a jutsu, as shown by 's inability to resurrect or  with his.

The ability for spirits of all realms to influence the living world is because all three worlds overlap into one another, allowing travel between them to become incredibly easy.