From Encyclopedia Mythica™ [link]

Jikininki

In Japanese myth, jikininki are demons, corpse-eaters, who eat dead human bodies. These demons are often the spirits of dead men or women whose greed prevented their souls from entering a more peaceful existence after death. They continue a half-life by devouring corpses. A particular myth tells of a strong-willed priest called Muso Kokushi who once kept watch near the body of a deceased person. Suddenly a jikininki arrived to devour it, but the priest's prayers liberated the demon's soul.