An evil spirit (悪霊, akuryō) is a special type of ghost created under special circumstances. When a person dies, they must wait on the Sanzu River for a shinigami to ferry them across. However, if a youkai steals their body away before they cross the river, that person will become an evil spirit. Unlike normal ghosts, evil spirits are hot to the touch.

Certain corpse-stealing youkai, especially seem to be capable of both creating and controlling evil spirits. Rin Kaenbyou sent evil spirits under her control above ground during Subterranean Animism, and also used them with her danmaku when she battled the heroines.

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