History, Heritage and Religion
Japanese beliefs often talk of "yurei" or ghosts. These ghosts are created when a dying soul is not purified. When this happens the ghost will haunt the area in which it once lived and harrass those responsible for its suffering in life. Usually when a person prays for it's salvation it is released from it's suffering and ascends to heaven. This is often seen in Inuyasha when Mayu or Hakushin's souls die dispising those around them only later to be forgiven their souls saved.