A yokai depicted by the Edo-period painter Toriyama Sekien in Konjaku Hyakki Shūi. Shown as a beauty from behind, yet the reflection on the water reveals a deeply wrinkled old face. Sekien notes he modeled its name “Iyaya” after the Chinese tale of the insect called “Guai zai” (“strange!”), rendering it as 否哉; no concrete traits are described. Later sources mention it under names like Iyami or Ijiami, but its existence in genuine tradition is doubtful.