Ongokuki

was a yōkai who abducted human children, and sold them to other yōkai by using a flute (what he received 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 the monk Ungai soon afterwards.

Trivia

 * Ongokuki may be based on the.

Ongokuki 音狱鬼