Shizu

is Shiori's mother. The village in which Shizu lived was under constant attack from bat demons, until she met Tsukuyomaru, a bat demon and son of Taigokumaru, who asked his father to stop the attacks or he would abandon his duties as guardian of the barrier that protected their tribe. Taigokumaru agreed, and Shizu gave birth to their child Shiori some time later. Unfortunately, Tsukuyomaru is killed and the attacks begin again. Taigokumaru made an agreement with the villagers - he will stop the attacks if they hand over his granddaughter, Shiori.

Shizu is torn between letting her daughter go or keeping her in the village, where she receives daily physical and emotional abuse. The villagers, however, eagerly agree to Taigokumaru's demands, and hand over Shiori. It is later revealed that Tsukuyomaru was murdered by his father. Upon hearing this, Shirori thrusts Taigokumaru out of the protective barrier, allowing InuYasha to destroy him.

The remaing bat demons leave the area, allowing Shizu and her daughter to live in peace, knowing that Tsukuyomaru is watching over them,