Ongokuki (音獄鬼, "Ogre of Underworld Melody") is a demon who abducts human children and sells them to other demons by using a flute, what he receives in return is unknown. One night he abducted Rin and brought her to a cave where he kept the other children, he was killed by Ungai soon afterwards. This article or section is a stub. You can help by [ expanding it] or contributing to the discussion.