Age
16
Origin
Japan
Koyuki was Hakuji(Akaza)'s deceased fiancee and also the daughter of his master. A fragile, kind and gentle young lady who always blushes and get emotional easily. Born very sick with a weak body, she remained ill for most of her life. Hakuji was the one who nurse her, help her recover and be able to enjoy a normal life for the first time. She later engaged with Hakuji but got poisoned by a rival dojo before they could get married. Losing her was the final step in Hakuji's transformation into the monstrous Akaza since he had no more will to live or care about anything without her. It was her soul that brought him back to his original self and willingly follow him into hell.
Demon Slayer: Kimetsu no Yaiba
Since ancient times, rumors have abounded of man-eating demons lurking in the woods. Because of this, the local townsfolk never venture outside at night. Legend has it that a demon slayer also roams the night, hunting down these bloodthirsty demons. For young Tanjirou, these rumors will soon to become his harsh reality... Ever since the death of his father, Tanjirou has taken it upon himself to support his family. Although their lives may be hardened by tragedy, they've found happiness. But that ephemeral warmth is shattered one day when Tanjirou finds his family slaughtered and the lone survivor, his sister Nezuko, turned into a demon. To his surprise, however, Nezuko still shows signs of human emotion and thought... Thus begins Tanjirou's quest to fight demons and turn his sister human again. (Source: VIZ Media)
