The Yurei Information :
In japanes believes all humans have a spirit/soul called ' Reikon'. When they die, the spirit leaves the body and wait till they get a proper funeral and post funeral rites to be performed, so they can join their ancestors,
however when a person dies a sudden death, like by suicide or murder, and their proper rites aren't performed, and they are influenced by powerfull emotions such as spite, love, jealousy, hatred, revenger or sorrow, the reikon transforms into a yurei, that makes them possoble to go back to the physical world.
The yurei, continue to exist on earth, until the spirit gets a funeral, either by performing the missing rituals or resolving the emotional conflict. when that doesn't happen, the yurei, keeps on haunting
Yūrei do not wander at random, but generally stay near a specific location, such as where they were killed or where their body lies, or follow a specific pe