Hinaki Ubuyashiki (産屋敷 ひなき Ubuyashiki Hinaki)is the oldest daughter of Kagaya Ubuyashiki.
Similar to the rest of her family, Hinaki had pale skin and large, purple eyes. She had white, shoulder-length hair styled into a blunt bob with bangs and sported a red ribbon on the right side of her head.
Hinaki was usually seen wearing a dark blue Hōmongi kimono decorated with purple flowers along with a maroon obi and a pink obiage and juban under everything, nearly identical to her twin sister with her sister Nichika.
Hinaki was usually very quiet, but kind. She loved her father very much and was loyal to him even to the point of dying alongside him.
The eldest daughter of the Ubuyashiki quintuplets. Nothing much is known about Hinaki, but for sure all we know is that she was always loyal to her father and never would stray away from him, she stayed by his side and died with him.
As her siblings it can be assumed that Hinaki has an enhanced intellect.