Koyuki

None

An ordinary civilian born with a congenital illness and no combat ability; her poisoning by a rival dojo is the tragedy that ends Hakuji's humanity.

Shown in flashback as a frail, sickly young woman with a gentle expression, often confined to her father's dojo due to poor health.

Kind and quietly grateful toward Hakuji, who nurses her back to health; her death devastates him and directly triggers his transformation into the demon Akaza.