Hiyuki is a tall, young woman with black hair and large eyes, known for being a loyal and formidable sorcerer of the Kamunabi organization in the manga Kagurabachi. She possesses the power of "Flame Bone," which allows her to summon and control fiery bones from a spiritual entity, making her a formidable opponent who can rival the strength of an Enchanted Blade. Initially, she is an antagonist to Chihiro, believing he should not wield his power independently, but her feelings evolve into respect