Also known as: reisa-nouryoku (霊査能力)
Lit.: "Spiritual investigation"; the ability to use the spiritual senses to distinguish between residual thought signatures, and thus recognize spiritual entities. A person with a high-level form of this ability could potentially recognize souls by the pattern of their "soul-nucleus", which is the part of the soul that remains unchanged through purification and rebirth, especially if they had met that person before previously. Haruie and Kousaka both excel at this ability, though Kousaka seems to be one of the few to possess a very high-level form of it.