Her greatest wish and drive for hunting Horrors was so that her daughter could live in a world where there is no need to fight. Her notable ability is her singing, where she frequently sings a song, which she taught her daughter, capable of calming people and heal physical wounds. It was also the key reason Ring wants her in his community. When she was blinded by a Horror while protecting Yuna, she was saved by Ring and the same wish found his ideals of co-existence between Horrors and humans appealing, causing her to join hands with the powerful Horror. Her place in the community is special and she does not interact with anyone other than Ring, but often sings to placate the emotions of the humans within the community, especially when one is about to be served as a Blood Dolce.
- Makai Priestess Training: ?.
- Madō Brush: ?.
- Iyu is portrayed by Karia Nomoto, who would later play a character named Sophia in the 14th episode of GARO: The One Who Shines in the Darkness.