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Yūrei (幽霊) are figures in Japanese folklore, analogous to Western legends of ghosts. The name consists of two kanji, 幽 (yū), meaning "faint" or "dim" and 霊 (rei), meaning "soul" or "spirit". Alternative names include 亡霊 (Bōrei), meaning ruined or departed spirit, 死霊 (Shiryō) meaning dead spirit, or the more encompassing 妖怪 (Yōkai) or お化け (Obake).
According to traditional Japanese beliefs, all humans have a spirit or soul called a 霊魂 (reikon). When a person dies, the reikon leaves the body and enters a form of purgatory, where it waits for the proper funeral and post-funeral rites to be performed, so that it may join its ancestors. If this is done correctly, the reikon is believed to be a protector of the living family and to return yearly in August during the Obon Festival to receive thanks.
However, if the person dies in a sudden or violent manner such as murder or suicide, if the proper rites have not been performed, or if they are influenced by powerful emotions such as a desire for revenge, love, jealousy, hatred or sorrow, the reikon is thought to transform into a yūrei, which can then bridge the gap back to the physical world. The emotion or thought need not be particularly strong or driving, and even innocuous thoughts can cause a death to become disturbed. Once a thought enters the mind of a dying person, their Yūrei will come back to complete the action last thought of before returning to the cycle of reincarnation.
The yūrei then exists on Earth until it can be laid to rest, either by performing the missing rituals, or resolving the emotional conflict that still ties it to the physical plane. If the rituals are not completed or the conflict left unresolved, the yūrei will persist in its haunting.
Oftentimes the lower the social rank of the person who died violently, or who was treated harshly during life, the more powerful as a yūrei they would return. This is illustrated in the fate of Oiwa in the story Yotsuya Kaidan, or the servant Okiku in Banchō Sarayashiki.
In the late 17th century, a game called Hyakumonogatari Kaidankai became popular, and kaidan increasingly became a subject for theater, literature and other arts. Ukiyo-e artist Maruyama Ōkyo created the first known example of the now-traditional yūrei, in his painting The Ghost of Oyuki. The Zenshō-an in Tokyo houses the largest single collection of yūrei paintings which are only shown in August, the traditional month of the spirits.
Today, the appearance of yūrei is somewhat uniform, instantly signalling the ghostly nature of the figure, and assuring that it is culturally authentic.
While all Japanese ghosts are called yūrei, within that category there are several specific types of phantom, classified mainly by the manner they died or their reason for returning to Earth.
There are two types of ghosts specific to Buddhism, both being examples of unfulfilled earthly hungers being carried on after death. They are different from other classifications of yūrei due to their wholly religious nature.
In Japanese folklore, not only the dead are able to manifest their reikon for a haunting. Living creatures possessed by extraordinary jealousy or rage can release their spirit as an ikiryō 生き霊, a living ghost that can enact its will while still alive.
The most famous example of an ikiryo is Rokujō no Miyasundokoro, from the novel The Tale of Genji. A mistress of the titular Genji who falls deeply in love with him, the lady Rokujō is an ambitious woman whose ambition is denied upon the death of her husband. The jealousy she repressed over Genji transformed her slowly into a demon, and then took shape as an Ikiryō upon discovering that Genji's wife was pregnant. This Ikiryō possessed Genji's wife, ultimately leading to her demise. Upon realising that her jealousy had caused this misfortune, she locked herself away and became a nun until her death, after which time her spirit continued to haunt Genji until her daughter performed the correct spiritual rites.
Yūrei often fall under the general umbrella term of obake, derived from the verb bakeru, meaning "to change"; thus obake are preternatural beings who have undergone some sort of change, from the natural realm to the supernatural.
However, Yūrei differ from traditional bakemono due to their temporal specificity. The Yūrei is one of the only creatures in Japanese mythology to have a preferred haunting time (the hour of the bull, around 2:00-2:30am, the witching hour for Japan, when the veils between the world of the dead and the world of the living are at their thinnest). By comparison, normal obake could strike at any time, often darkening or changing their surroundings should they feel the need. Similarly, Yūrei are more bound to specific locations of haunting than the average bakemono, which are free to haunt any place without being bound to it.
Yanagita Kunio generally distinguishes Yūrei from Obake by noting that Yūrei tend to have a specific purpose for their haunting, such as vengeance or completing unfinished business. While for many Yūrei this business is concluded, some Yūrei such as the famed Okiku remain earthbound due to the fact that their business is not possible to complete. In Okiku's case, this business is counting plates hoping to find a full set, but the last plate is invariably missing or broken according to the different retellings of the story. This means that her spirit can never find peace, and thus will remain a jibakurei.
Some famous locations that are said to be haunted by yūrei are the well of Himeji Castle, haunted by the ghost of Okiku, and Aokigahara, the forest at the bottom of Mt. Fuji, which is a popular location for suicide. A particularly powerful onryō, Oiwa, is said to be able to bring vengeance on any actress portraying her part in a theater or film adaptation.
Okiku, Oiwa, and the lovesick Otsuya together make up the San O-Yūrei (Japanese: 三大幽霊, "three great Yūrei") of Japanese culture. These are Yūrei whose stories have been passed down and retold throughout the centuries, and whose characteristics along with their circumstances and fates have formed a large part of Japanese art and society.
The easiest way to exorcise a yūrei is to help it fulfill its purpose. When the reason for the strong emotion binding the spirit to Earth is gone, the yūrei is satisfied and can move on. Traditionally, this is accomplished by family members enacting revenge upon the yūrei's slayer, or when the ghost consummates its passion/love with its intended lover, or when its remains are discovered and given a proper burial with all rites performed.
The emotions of the onryō are particularly strong, and they are the least likely to be pacified by these methods.
On occasion, Buddhist priests and mountain ascetics were hired to perform services on those whose unusual or unfortunate deaths could result in their transition into a vengeful ghost, a practice similar to exorcism. Sometimes these ghosts would be deified in order to placate their spirits.
Like many monsters of Japanese folklore, malicious yūrei are repelled by ofuda (御札), holy Shinto writings containing the name of a kami. The ofuda must generally be placed on the yūrei's forehead to banish the spirit, although they can be attached to a house's entry ways to prevent the yūrei from entering.