Translated as "Compare Wings," Hiyoku is a red bird Shinma with a sword blade for a right hand. He appears in the form of Tokiya Inoue and learns from a golden bird that he is a Shinma of the Bird Tribe. He gained a tattoo of the tribe from that bird. He returned to Chisato's home just to get to Miyu and kill her. When his tattoo became known to Miyu and Larva, he transformed into his Shinma form. Miyu used her flame attack on Hiyoku who reverted back to Tokiya before perishing/returning to "The Darkness."

Unbeknownst to Miyu and Larva, he left behind a strange blade for Chisato. It was later mentioned by the Shinma Shidon that Hiyoku was just a diversion so that the strongest Shinma opponent for Miyu would finally awaken.

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