The Sanchuu (三虫, lit. Three Insects) are parasitic youkai emissaries of Enma-Daiou. The Sanchuu appeared only in the "Nezumi-Otoko and Neko-Musume" story. They live inside every person and tattle to Enma if a person is really wicked. Then a red draft paper is send to a youkai to kill that person.
(Source: GeGeGe no Kitarou Wiki)
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