Onmoraki (おんもらき, Onmoraki) is a recurring demon in the series.
In Shinto mythology, an Onmoraki is a bird-demon created from the spirits of freshly-dead corpses. They resemble a black crane, and if a person is caught sleeping in a temple's sermon hall, the Onmoraki will rebuke them while flapping it's wings. Onmoraki are also said to shout the Degeneration Sutra in the household altar of priests who neglect to read their sutras.
"A Japanese bird that takes the form of a bird with the face of a man and a sickening chirp. It can also spit fire. It's true identity is a corpse that has not had a proper memorial service. It is said to appear before monks who neglect their duties." - Strange Journey Compendium