Shiori's father, Tsukuyomaru, hailed from a clan of bat demons that fed on the blood of humans and animals. Shiori's mother's village was one of their hunting grounds. However, Tsukuyomaru was different from the others—he did not kill humans and eventually met Shizu, falling in love with her. After Shiori was born, the attacks ceased, and the village enjoyed peace until Tsukuyomaru's untimely death.
In an effort to halt the attacks on the village, Shizu, Shiori's mother, agreed to offer Shiori to her grandfather, Taigokumaru. Initially, Shiori refused to leave because she was afraid of him, but after persuasion from the villagers, she reluctantly went to Taigokumaru's side.
Like Inuyasha, Shiori endured constant bullying throughout her childhood for being a half-demon, despite the evident peace that Tsukuyomaru had brought to her village. Her mother also faced discrimination, and they both lived isolated from the rest of the village, highlighting the villagers' ingratitude for Tsukuyomaru's kindness. When Taigokumaru broke his promise, the villagers attacked Shiori's mother, only to be stopped by Inuyasha and his friends.
Shiori, like her father and grandfather, has the ability to create barriers using a red orb called the Blood Coral Crystal. This skill and responsibility are passed down through generations as the ability to create barriers diminishes with age and is lost once the duty is transferred to someone else. The barriers created by the bat demons are impenetrable, even deflecting Tessaiga's Kaze no Kizu and withstanding the Backlash Wave.
(Source: Inuyasha Wikia)
